Updated on 2024/04/02

写真a

 
SATO,Tomohiro
 
Organization
Faculty of Engineering Science Professor
Title
Professor
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Degree

  • Doctor of Engineering ( 2007.3 )

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Mechanics of materials and materials

  • Nanotechnology/Materials / Structural materials and functional materials

Education

  • Kansai University   Graduate School, Division of Engineering

    2007

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Professional Memberships

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Committee Memberships

  •   機械材料・材料加工部門(101期)第6技術委員委員長  

    2023.4 - 2024.3   

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  • 日本機械学会   技術ロードマップ委員会委員  

    2022.6 - 2023.3   

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  • 日本機械学会   材料力学部門(100期・101期)運営委員  

    2022.3 - 2024.3   

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  • 日本機械学会   機械材料・材料加工部門(100期)部門幹事兼第6技術委員副委員長  

    2022.3 - 2023.3   

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  •   ITC2023Fukuoka実行委員  

    2021.9 - 2023.9   

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  • 日本機械学会   機械材料・材料加工部門(99期)第5技術委員委員長兼第6技術委員幹事  

    2021.4 - 2022.3   

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  • 日本機械学会   ICM&P2022実行委員  

    2021 - 2022.11   

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  • 日本機械学会   機械材料・材料加工部門(98期)運営委員兼第5技術委員副委員長  

    2020.4 - 2021.3   

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  • 日本機械学会   機械材料・材料加工部門(97期)運営委員  

    2019.4 - 2020.3   

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  • 日本機械学会   機械材料・材料加工部門運営(96期)委員兼第1技術委員委員長  

    2018.4 - 2019.3   

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  • 日本機械学会   若手の会委員  

    2018.4 - 2019.3   

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  • 日本機械学会   機械材料・材料加工部門(95期)運営委員兼第1技術委員副委員長  

    2017.4 - 2018.3   

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  • 日本トライボロジー学会   編集委員会司会幹事(第61期)  

    2016.6 - 2017.5   

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  • 日本トライボロジー学会   編集・出版委員会委員(第60-62期)  

    2015.6 - 2018.5   

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  •   総合技術監理部門(2015年4月~)  

    2015.4   

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  • 日本機械学会   関西支部商議員(90・91期)  

    2014.4 - 2016.3   

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  • 日本トライボロジー学会   トライボロジー会議2015春姫路 実行委員会 委員  

    2013.11 - 2015.5   

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  • 日本トライボロジー学会   編集委員会編集幹事(第57期)  

    2012.6 - 2013.5   

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  • 日本トライボロジー学会   編集委員会委員(第56期-第58期)  

    2011.6 - 2014.5   

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  •   金属部門(2011年3月~);総合技術監理部門(2015年4月~)  

    2011.3   

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  • 日本技術士会   金属部門(2011年3月~)  

    2011.3   

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  • 日本機械学会   関西支部商議員(86・87期)  

    2010.4 - 2012.3   

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  •   MD部門委員(2007年4月~)  

    2007.4   

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Papers

  • Time-dependent subcritical crack growth and its mechanism in Ni-based single crystal superalloys at 500 °C

    Yoshimasa Takahashi, Daisuke Kobayashi, Shintaro Fujii, Shigeo Arai, Masanori Takuma, Ken-ichi Saitoh, Tomohiro Sato

    Materials Science and Engineering: A   889   145869 - 145869   2024.1

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.msea.2023.145869

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  • Study on failure/fracture mechanisms of 3D printed objects by FDM with AE method (Evaluation by using Empirical Mode Decomposition and Chaos analysis)

    Masanori TAKUMA, Koki TSUJII, Ken-ichi SAITOH, Yoshimasa TAKAHASHI, Tomohiro SATO, Yutaka NIKI

    Transactions of the JSME (in Japanese)   90 ( 930 )   23 - 00271   2024

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Mechanical Engineers  

    DOI: 10.1299/transjsme.23-00271

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  • Development of Environmentally Friendly Composite Materials for 3D Modeling

    Taiki YAMASHITA, Tomohiro SATO, Ken-ichi SAITOH, Masanori TAKUMA, Yoshimasa TAKAHASHI

    Journal of the Japan Society of Powder and Powder Metallurgy   2024

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Powder and Powder Metallurgy  

    DOI: 10.2497/jjspm.23-00075

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  • Shear Deterioration of the Hierarchical Structure of Cellulose Microfibrils under Water Condition: All-Atom Molecular Dynamics Analysis Reviewed

    IZUMI,Yukihiro, SAITOH,Ken-ichi, SATO,Tomohiro, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    Applied mechanics   4,230-247   2023.2

  • Time-dependent crack growth mechanism in Ni-based single crystal superalloys at high-temperature

    Yoshimasa Takahashi, Daisuke Kobayashi, Shintaro Fujii, Masanori Takuma, Ken-ichi Saitoh, Tomohiro Sato

    Materials Science and Engineering: A   859   144179 - 144179   2022.11

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.msea.2022.144179

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  • Impact and frictional properties of sulfide-dispersed Ni bronze affected by heat treatment Reviewed

    SATO,Tomohiro, ASADA,Hiroki, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    Journal of Japan Institute of Copper   第61巻1号(2022)、pp.97-102.   2022.8

  • Study on damage evaluation of bimetal with the lead-free copper alloy (Life evaluation in bending fatigue test with AE method) Reviewed

    TAKUMA,Masanori, SATO,Tomohiro, SAITOH,Ken-ichi, TAKAHASHI,Yoshimasa, HIRAI,Yoshimasa

    Transactions of the JSME(in japanese)   DOI:10.1299/transjsme.22-00019   2022.4

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  • Optimization of LIB Electrolyte and Exploration of Novel Compounds via the Molecular Dynamics Method Reviewed

    SAITOH,Ken-ichi, TAKAI,Yoshihiro, SATO,Tomohiro, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    batteries   2022,8(3),27   2022.3

  • Molecular Dynamics Analysis on Silica Interface Modeled in Surface Grinding Process for Non-firing Solidification Molecular Dynamics Analysis on Silica Interface Modeled in Surface Grinding Process for Non-firing Solidification Reviewed

    SATO,Tomohiro, KUBOTA, Atsuto, SAITOH, Ken-ichi, FUJI, Masayoshi, TAKAI, Chika, SENA, Hadi, TAKUMA, Masanori, TAKAHASHI, Yoshimasa

    Journal of the Society of materials Science, JAPAN   第71巻、2号、pp167-174.   2022.2

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  • Evaluation of Sulfides as Solid Lubricant: Lubricity of Compounded Sulfides Reviewed

    SATO,Tomohiro, ISHIKAWA,Shuhei, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    Key Engineering Materials   Vol.901,pp 164-169.   2021.10

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  • Effects of Heat Treatment for Cu-Ni-Sn-S Alloys Effects of Heat Treatment for Cu-Ni-Sn-S Alloys Reviewed

    SATO,Tomohiro, ASDA,Hiroki, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    Journal of Japan Institute of Copper   第60巻1号(2021)pp.87-92.   2021.8

  • Pseudo Generation of Metallographic Images and Verification of Superiority for Discrimination Problems -Applying Adversarial Generative Networks- Reviewed

    KURIBAYASHI,Daiki, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    J.Jpn.Soc.Powder Powder Metallugy   Vol. 68 No. 8 ,pp 317-323.   2021.8

  • Friction Properties of Sintered Al Bronze Containing Dispersed Sulfides Reviewed

    SATO,Tomohiro, JINGU,Akihiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    Transactions of Powder Metallurgy Association of India   Vol.45 No.2,December 2019 pp.39-50.   2021.1

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  • Molecular Dynamics Study on SiO2 Interfaces of Non-firing Solids Reviewed

    SATO,Tomohiro, KUBOTA,Atsuto, SAITOH,Ken-ichi, FUJI,Masayoshi, TAKAI,Y,Chika, SENA,Hadi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    Journal of Nanomaterials   Vol.2020,Article ID8857101   1 - 13   2020.12

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    Publishing type:Research paper (scientific journal)   Publisher:Hindawi Limited  

    As a sustainable ecosystem, the general firing process for ceramics emits large amounts of CO2 gas; thus in ceramics production, the focus is the nonfiring process; however, the solidification and strengthen mechanism of this nonfiring system, which essentially reacts between surface-activated ceramic particles and a solvent, has not been elucidated to date. The nonfiring process had three steps, i.e., particle surface activate process by grinding process, maintaining the active state until starting nonfiring solidification begins, and nonfiring solidification process. Thus, in this study, the reaction of silica and water was simulated by adapting molecular dynamics based on LAMMPS with ReaxFF potentials. Reproducing the activated silica surface state, three ended models called O model, Si model, and OH model were prepared which indicated ended molecules of each surface. These models and a water molecule as a solvent were bonded in the atomic scale, and the energetic state and mechanical properties were evaluated. A reacted or structured O-H-O bond was reproduced in the nonfiring process in the O-ended model. The bond was a hydrogen bond. A Si-O-Si bond was produced when a Si atom was ended on the interface. The bonded interface was able to tensile. However, the tensile strength was weaker than that of the solid silica model. The nonbonded OH model did not have tensile strength.

    DOI: 10.1155/2020/8857101

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    Other Link: http://downloads.hindawi.com/journals/jnm/2020/8857101.xml

  • Molecular Dynamics Study of Collagen Fibrils: Relation between Mechanical Properties and Molecular Chirality Reviewed

    SAITOH,Ken-ichi, SATO,Tomohiro, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    Journal of Biomaterials and Nanobiotechnology   Vol.11 No.4, October 2020, 260-278   2020.9

  • Non-firing solidification: A new room temperature ceramics processing Reviewed

    Hadi Razavi-Khosroshahi, Tomohiro Sato, Masayoshi Fuji

    Advanced Powder Technology   Volume 31, Issue 5, May 2020, Pages 2020-2024   2020.3

  • Sub-micro-sized Molecular Dynamics Analysis for Investigation of Dislocation in Wiredrawing Proces

    Koki Yoshida, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    (2019), pp.227-228   2019.10

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  • Molecular Dynamics Study on Plastic Deformation of Pearlitic Steel in Wiredrawing

    Kosuke Oda, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    (2019), pp.229-230   2019.10

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  • Peridynamics Study on Stress Analysis on Hard Film and Base Material

    Tomohiro Sato, Daiki Kuribayashi, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi

    No.19-19 (2019),(CD-ROM #249),   2019.9

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  • Interactive Visualization Technique of Molecular Dynamics Simulation by Using HMD and VR

    Ken-ichi Saitoh, Naoto Hiramatsu, Tomohiro Sato, Masanori Takuma, Yoshimasa Takahashi

    No.19-19 (2019),(CD-ROM #195),   2019.9

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  • Elastic-Plastic and Fracture Behaviors of SiC material by Peridynamics and MD Simulations", ) (2019/9/16-18, .発表9/16).

    Ken-ichi Saitoh, Kazuki Aso, Yusuke Imamura, Kenji Nishimura, Tomohiro Sato, Masanori Takuma, Yoshimasa Takahashi

    No.19-19 (2019),(CD-ROM #256),   2019.9

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  • Molecular Dynamics Study on Transmission Mechanism of Torsional Deformation in Cellulose Nanofibers with Hierarchical Structure

    Kentaro Takada, Ken-ichi Saitoh, Tomohiro Sato, Masanori Takuma, Yoshimasa Takahashi

    Soft Nano Science Letters   Vol.9 (2019), pp.45-57.   2019.9

  • MOLECULAR DYNAMICS SIMULATION OF LI-ION COORDINATION STRUCTURES AND TRANSPORT PROPERTIES IN LIB ELECTROLYTES : INFLUENCE OF MOLECULAR SIZE

    Yoshihiro Takai, Yuusuke Terai, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    No.61, (2019), pp.1-10.   2019.7

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  • Plug Molding of Multilayer Laminate Film for Press Through Package: FEM Simulation and Experiment

    Maui Iwamoto, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    (2019), pp.181-182.   2019.6

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  • Large-scale Molecular Dynamics Simulations for Investigating Dislocation Strengthening Mechanism in Wiredrawing Process

    Koki Yoshida, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    Vol.24,(2019), A-04-02(CD-ROM)   2019.5

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  • Atomic Behavior near Interface of Drawn Pearlite Steel Analyzed by Nano-indentation MD Model

    Kosuke Oda, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    Vol.24,(2019), A-04-06(CD-ROM)   2019.5

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  • Molecular Solvation Structure in LIB Electrolyte by MD Calculation and Hierarchical Clustering Method

    Yusuke Terai, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    (2019), P32(USB)   2019.5

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  • Molecular dynamics simulation on processing mechanism of SiC:Temperature dependence of plastic deformation for 3C- and 4H-SiC

    Yusuke Imamura, Ken-ichi Saitoh, Kenji Nishimura, Tomohiro Sato, Masanori Takuma, Yoshimasa Takahashi

    (2019), P31(USB)   2019.5

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  • Fundamental study on functionality of synthetic sulfides -Evaluation of metal sulfides as solid lubricant- Reviewed

    ISHIKAWA Syuhei, SATO Tomohiro, SAITOH Ken-ichi, TAKUMA Masanori, TAKUMA Masanori

    Jurnal Tribologi   Vol.20,pp26-38.   2019.3

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  • Atomistic Simulation of Heavily Plastic Deformation of Pearlitic Steel: Nano-sized Processes of Wiredrawing and Indentation

    Ken-ichi Saitoh, Kosuke Oda, Koki Yoshida, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    IOP Conf. Series: Materials Science and Engineering   Vol.461,(2019), 012074, pp.1-6   2019

  • Study on evaluation of rail axial stress with ultrasonic wave method (Application of wavelet transform results)

    Keisuke OOSUMI, Masanori TAKUMA, Kenichi SAITOH, Yoshimasa TAKAHASHI, Tomohiro SATO, Ken YAMAMOTO

    Transactions of the JSME (in Japanese)   85 ( 880 )   19 - 00206   2019

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Mechanical Engineers  

    DOI: 10.1299/transjsme.19-00206

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  • Peridynamics Simulation of Elastic-plastic deformation and Fracture in Glass Materials

    Ken-ichi Saitoh, Rei Kawamura, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    No.18-8 (2018),(CD-ROM #264),   2018.11

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  • Molecular Dynamics Study on Strengthening Mechanism by Dislocations in Wiredrawing Process

    Koki Yoshida, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    No.18-8 (2018),(CD-ROM #215),   2018.11

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  • Study on Atomistic Mechanism in Interface of Pearlite Phase: Molecular Dynamics Analysis of Wiredrawing and Nano-indentation

    Kosuke Oda, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    No.18-8 (2018),(CD-ROM #238),   2018.11

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  • Molecular Dynamics Study on Plastic Deformation of Pearlite: Wiredrawing and Nano-indentation Models

    Kosuke Oda, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    (2018), pp.133-134.   2018.10

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  • Molecular Dynamics Analysis of Wiredrawing Mechanism and Lattice Defects Behavior

    Koki Yoshida, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    Vol.18-1(DVD #J0450105), (2018   2018.9

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  • Molecular dynamics analysis of cellulose nanofibers for torsional deformation: Elucidation of deformation mechanism associated with hierarchical structure

    Kentaro Takada, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    Vol.18-1(DVD #J0450104), (2018   2018.9

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  • Molecular dynamics simulation aimed at screening compounds for new LIB electrolytes

    Yoshihiro Takai, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    Vol.18-1(DVD #J0310301), (2018   2018.9

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  • Molecular Dynamics Analysis of Dislocation Mechanism in Metal Wiredrawing: Relation between Dislocation and Stress Depending on Crystal Orientations

    Koki Yoshida, Ken-ichih Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    Vol.23 , (2018)   2018.6

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  • Peridynamics and Molecular Dynamics Simulations of Silicon Carbide in Elastic-plastic deformation and fracture

    Ken-ichih Saitoh, Naomich Ota, Kenji Nishimura, Tomohiro Sato, Masanori Takuma, Yoshimasa Takahashi

    Vol.23 , (2018)   2018.6

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  • 伸線加工によるナノワイヤの実現に向けた加工原理の探求

    吉田紘基, 齋藤賢一, 宅間正則, 高橋可昌, 佐藤知広

    日本材料学会第3回マルチスケール材料力学シンポジウム(第23回分子動力学シンポジウム)講演論文集   (2018), P6(USB)   2018.5

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  • 新規LIB電解液用化合物の物性予測に向けた分子動力学シミュレーション

    高井義博, 齋藤賢一, 宅間正則, 高橋可昌, 佐藤知広

    日本材料学会第3回マルチスケール材料力学シンポジウム(第23回分子動力学シンポジウム)講演論文集   (2018), P5(USB)   2018.5

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  • セルロースナノファイバーの階層的変形構造と捻回特性に関するMD解析

    高田健太郎, 齋藤賢一, 宅間正則, 高橋可昌, 佐藤知広

    日本材料学会第3回マルチスケール材料力学シンポジウム(第23回分子動力学シンポジウム)講演論文集   (2018), P9(USB)   2018.5

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  • 伸線パーライト鋼のMDモデルにおけるセメンタイト分解現象

    尾田幸介, 齋藤賢一, 宅間正則, 高橋可昌, 佐藤知広

    日本材料学会第3回マルチスケール材料力学シンポジウム(第23回分子動力学シンポジウム)講演論文集   (2018), P7(USB)   2018.5

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  • Microdynamics of drawn pearlitic steel wire: Investigation on interatomic potentials and interface models in molecular dynamics

    Ken-ichih Saitoh, Kosuke Oda, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    (2018)   2018.5

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  • Molecular dynamics study on nano-sized wiredrawing: Possible atomistic process and application to pearlitic steel wire

    K. Saitoh, K. Yoshida, K. Oda, T. Sato, M. Takuma, Y. Takahashi

    IOP Conference Series: Materials Science and Engineering   307 ( 1 )   2018.2

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Institute of Physics Publishing  

    The process of nano-sized wiredrawing is investigated by using molecular dynamics (MD) simulation in this study. The authors have constructed novel computation models of wiredrawing, in which a single wire of just a several nanometers in diameter is smoothly drawn through a perfectly rigid die together with lubrication mechanism and is forced to be shaped into thinner one. Interatomic potentials used in MD simulation is a conventional pairwise type useable for iron-carbon binary system (for pearlitic steel). For MD model of pearlite steel wire, it is recognized that ferrite-cementite interface effectively offers high-speed diffusion path for carbon atoms from cementite side to ferrite side (elementary mechanism of cementite decomposition). As conclusion, we showed by using atomistic simulation that nano-sized wiredrawing process is theoretically quite possible.

    DOI: 10.1088/1757-899X/307/1/012039

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  • Molecular Dynamics Study on Deformation Mechanism of Grain Boundaries in Magnesium Crystal: Based on Coincidence Site Lattice Theory

    Ken-ichi Saitoh, Kohei Kuramitsu, Tomohiro Sato, Masanori Takuma, Yoshimasa Takahashi

    Journal of Materials   Vol.2018, (2018), pp.4153464(A   2018

  • Fracture mechanics criterion of time-dependent crack initiation from interface free-edge in adhesively bonded butt joints Reviewed

    Yoshimasa Takahashi, Kosuke Inoue, Masanori Takuma, Ken-ichi Saitoh, Tomohiro Sato

    ENGINEERING FRACTURE MECHANICS   186   368 - 377   2017.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    The time-dependent crack initiation from the interface free-edge of adhesively bonded axisymmetric columnar butt joints (epoxy/SUS, edge shape: 90 degrees/90 degrees) was investigated in detail. With the change of applied stress level, sigma(n), the butt joints exhibited crack initiation life, t(C), that varied about four orders of seconds (10(2)-10(6) s). Such a clear time-dependent life property was then studied in terms of the fracture mechanics. The near-edge stress/strain field at the crack initiation was numerically evaluated with the finite element method (FEM) by applying the time-hardening creep law to the epoxy resin. It was found that the critical asymptotic stress field along the interface represented by the combination of two parameters, lambda(cr)(sigma) (creep stress singularity index) and K-sigma(cr) (creep stress intensity factor), satisfies a unique relation irrespective of (sigma(n), t(C)) sets. The same tendency was also confirmed when the near-edge total strain field parameters were employed. These results indicate that the K-lambda criterion, originally developed for static fracture problems, still holds its validity in the time domain. (C) 2017 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.engfracmech.2017.08.017

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  • Molecular Dynamics Study on Wiredrawing of Iron and Steel: Effect of Texture in Die Surface on Friction and Plasticity

    Ken-ichi Saitoh, Koki Yoshida, Kazuki Yokohama, Tomohiro Sato, Masanori Takuma, Yoshimasa Takahashi

    (2017), pp.15-16   2017.11

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  • Peridynamics Modeling of Elastic-Plastic Deformation and Failure Behavior for SiC Indentation Test

    Naomich Ota, Ken-ichih Saitoh, Kenji Nishimura, Tomohiro Sato, Masanori Takuma, Yoshimasa Takahashi

    No.17-4 (2017),(CD-ROM #125),   2017.9

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  • Molecular Dynamics Analysis of Cellulose Nanofiber: Evaluation of Hydrogen Bonds in Torsional Deformation

    Kentaro Takada, Ken-ichih Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    No.17-4 (2017),(CD-ROM #176),   2017.9

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  • Molecular Dynamics Study on Electrolytes for High Performance Lithium Ion Battery

    Yoshihiro Takai, Ken-ichih Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    No.17-4 (2017),(CD-ROM #177),   2017.9

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  • Peridynamics Simulation of Indentation Test for SiC Crysta; Collaboration with Molecular Dynamcis

    Naomich Ota, Ken-ichih Saitoh, Kenji Nishimura, Yuichi Yamamoto, Tomohiro Sato, Masanori Takuma, Yoshimasa Takahashi

    Vol.17-1 (CDROM #G0100101), (2   2017.9

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  • Molecular Dynamics Study on Atomistic Behavior in Interface of Drawn Pearlitic Steel Wire

    Ken-ichih Saitoh, Ayato Kitatani, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    (2017), pp.207-208   2017.6

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  • Combined Effects of Penetrated Graphite and Dispersed Sulfide on the Tribological Properties of Bronze Reviewed

    HIRAI,Yoshimasa, OGAWA,Kohei, SATO,Tomohiro, USAMI,Hatsuhiko

    Journal of Japan Societu for Design Engineering   VOl.52(2017),No.4 pp251-260.   2017.4

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    Language:Japanese   Publisher:Japan Society for Design Engineering  

    <p>The present study describes the tribological properties of penetrated graphite bronze containing dispersed sulfide under dry conditions. The graphite was penetrated using a shot peening and roller burnishing to the friction surface only. Shot peening was applied to obtain a micro-dimples for penetrate the graphite. The tribological properties were evaluated using a face-to-face-type testing apparatus under dry conditions. The counter specimen was three chromium alloy steel balls with a flat surface. The disc specimens were prepared for sulfide bronze and bronze, respectively casting material and sintering material. The results showed that the friction properties improved by penetrated graphite. In particular, sintering sulfide bronze did not occurred seizure at high load. The contact surface of bronze without sulfide observed not only disc-component but also the ball-component by EPMA analysis. Furthermore, it was inferred that the friction properties was improved when sulfide and graphite were each other different area on friction surface by EPMA analysis. Combined effects of sulfide and graphite on the tribological properties of the bronze under dry sliding conditions were confirmed.</p>

    DOI: 10.14953/jjsde.2016.2719

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  • Development of Lead-Free Bronze with Sulfide Dispersion for Sliding Applications

    Tomohiro Sato, Yoshimasa Hirai, Takeshi Kobayashi

    INTERNATIONAL JOURNAL OF METALCASTING   11 ( 1 )   148 - 154   2017.1

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    Cu alloys such as bronze have long been used as bearing materials because of their good run-in properties for steels used as mating materials. These Cu alloys are also suitable for various applications: High-strength brass castings and phosphorus bronze castings are used for their ability to obtain higher strengths, whereas Pb-bronze castings are used for anti-seizure applications. To prevent scoring and seizure, base materials such as Cu alloys were often combined with a solid lubricant. In this study, the tribological properties of sulfide-dispersed bronze were investigated. Friction tests were conducted under dry conditions for bronze with/without sulfides. It was found that seizure was prevented in sulfide-bronze systems only under certain test conditions. It was estimated that the dispersed sulfide restricted the transfer of the Cu alloy elements to the mating steel surface. Moreover, the addition of Si to a Cu-Fe-S system and to sulfide-dispersed bronze resulted in crystallization of Fe-Si compounds. The hardness and anti-wear properties of the compounds were also improved.

    DOI: 10.1007/s40962-016-0099-2

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  • Modelling and analysis of SiO<sub>2</sub> for Strengthening Mechanisms of non-firing solids

    SATO Tomohiro, SAITOH Ken-ichi, FUJI Masayoshi, TAKAI Chika Yamashita, RAZAVI Hadi, TAKUMA Masanori, TAKAHASHI Yoshimasa

    The Proceedings of The Computational Mechanics Conference   2017 ( 0 )   108 - 108   2017

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    DOI: 10.1299/jsmecmd.2017.30.108

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  • Effects of machining history on tribological properties of bronze containing Micro-sized sulfide

    Yoshimasa Hirai, Kohei Ogawa, Tomohiro Sato, Hatsuhiko Usami

    Key Engineering Materials   749   246 - 250   2017

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    Bronze based alloys have come to be used as bearing materials, and require low frictional properties. The present study describes the effects of surface finish machining history on the tribological properties of sulfide-containing bronze sintered onto a steel disc. The sulfide phase consisted of copper, iron and sulfur, and acted as a solid lubricant. The relative density of the specimen was 90 % and the microstructure showed that the micro-sized sulfide dispersed into the bronze matrix and was accompanied by sintering pores. Various processes, including cutting, burnishing and polishing, were applied to finish the surface. It was found that the area fraction of the sulfide phase depended on the cutting conditions. A further increase in the area fraction was achieved using roller burnishing after the cutting. Tribological properties were evaluated using chromium alloy steel (SUJ2) as the mating surface under dry conditions. The results showed that the friction coefficient depended on the surface finishing process. Therefore, the machining history had an effect on the frictional properties of the sulfide-containing bronze. Optimal cutting conditions for the sulfide containing bronze are also discussed.

    DOI: 10.4028/www.scientific.net/KEM.749.246

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  • Evaluation of Thermoelectric Properties of Synthesized Sulfides as Solid Lubricants

    SATO Tomohiro, AKAMUNE Toshiki, ISHIKAWA Shuhei, SAITOH Ken-ichi, TAKUMA Masanori, TAKAHASHI Yoshimasa

    The Proceedings of the Conference on Information, Intelligence and Precision Equipment : IIP   2017   A - 14   2017

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    Sufides as MoS<sub>2</sub> are known as solid lubricants. These materials are also known as thermoelectric materials. However, there is no materials satisfied both functions at the same time. In this study, sulfides powders such Cu<sub>2</sub>S (chalcocite), SnS, Cu<sub>5</sub>FeS<sub>4</sub> (bornite) were synthesized under vacuum condition. Some specimens were evaluated by friction tester and their lubricity, not only sintered sulfied but also blended and sintered sulfides with bronze powders were compared. Other specimens were evaluated their seebeck coefficients, that is one of the thermoelectric properties. Experiments results of the seebeck coefficients were compared with simulation results. As a result, it was found that SnS and blended SnS with bronze had indicated better friction properties. For thermoelectric properties, seebeck coefficient of Cu<sub>2</sub>S had matched with experiments and simulation. Totally, Cu<sub>2</sub>S (chalcocite) has superior properties as both solid lubricant and thermoelectric material.

    DOI: 10.1299/jsmeiip.2017.A-14

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  • Combined effects of graphite and sulfide on the tribological properties of bronze under dry Conditions Reviewed

    HIRAI,Yoshimasa, SATO,Tomohiro, USAMI,Hatsuhiko

    Jurnal Tribologi   Vol.11 (2016) 14-23.   2016.11

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  • Molecular Dynamics Study on Plastic Deformation Behavior of Mg Polycrystal: Dislocation Emission and Twinning Mechanism from Grain Boundary

    Kohei Kuramitsu, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    No.16-4 (2016),(CD-ROM #260),   2016.9

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  • Molecular Dynamics Simulation of Iron and Steel Wiredrawing: Influence of Nano-scale Surface Texturing

    Takayuki Niki, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    No.16-4 (2016),(CD-ROM #249),   2016.9

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  • Molecular Dynamics Analysis of Hydrogen under Microscopic Stress Field of \alpha-Fe Crystal and Grain Boundaries

    Haruka Koga, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    No.16-4 (2016),(CD-ROM #212),   2016.9

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  • Molecular Dynamics Study on Mechanical Functions of Cellulose Nanofiber Material

    Ken-ichi Saitoh, Daisuke Sakimoto, Tomoki Makita, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    Vol.21 , (2016-5), F-5-2(CD-R   2016.6

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  • Friction Property of Lead-free Bronze Castings Disperesed with Sulfide Particles for Sliding Reviewed

    HIRAI,Yoshimasa, SATO,Tomohiro, KOBAYASHI,Takeshi

    Journal of Japan Foundry Engineering Society   第88巻第6号pp.325-331 ( 6 )   325 - 331   2016.6

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    <p>  Comparative testing for frictional properties of castings between lead-free bronze dispersed with sulfide particles, leaded bronze, and phosphor bronze was carried out. The composition of the lead-free bronze was determined by referring to calculated phase diagrams. A pin-on-disk friction tester was used for the comparative testing of the castings between the lead-free bronze and leaded bronze. A ball-on-disk friction tester was used for the comparative testing of castings between the lead-free bronze and phosphor bronze. Seizure resistance of the bronze castings was evaluated by changing the friction coefficient with sliding time at various load conditions. The influence of sulfide particles dispersion on the lead-free bronze castings was evaluated by microstructure observation before and after the friction tests and results of elemental mapping by EPMA. The seizure resistance of the lead-free bronze castings was better than that of the leaded bronze castings. Sulfide and oxide existed on the friction surface after the friction tests, suggesting that the sulfide and oxide prevent transfer to counterparts.</p>

    DOI: 10.11279/jfes.88.325

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  • Molecular Dynamics Simulation of Steel Wiredrawing: Analyses of Residual Stress and Hydrogen Diffusion

    Ken-ichi Saitoh, Haruka Koga, Masanori Takuma, Yoshimasa Takahashi, Tomohiro Sato

    (2016), pp.233-234   2016.5

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  • Evaluation of radial crushing strength on bronze sintered in vacuum atmosphere-effect of sulfide and tin

    Tomohiro Sato, Takehiro Muraoka, Ken-Ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi, Yoshimasa Hirai

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   63 ( 5 )   255 - 260   2016.5

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    Copper (Cu) alloys are used as sliding materials. Especially, bronze (Cu-Sn alloy) is popular material for sintered bearings. In the sintering process, the reductive atmosphere is generally adopted on an industrial field to reduce the oxide which exists on the surface of Cu-Sn alloy powders as atomized. However, sintering in the vacuum atmosphere is useful because of disusing any kinds of gases. It was reported that sintering in the vacuum atmosphere gives better properties unless the alloy powder is heavily oxidized. In this report, the radial crushing strengths was investigated for the sintered Cu-Sn alloys which were the bronze and the sulfide dispersed bronze (Sulfide bronze). Especially tin powder and fine tin powder were used as the additives mixed for the Cu-Sn alloys to compare the radial crushing strengths. With increasing compacting pressure and sintering temperature, the pores in the sintered specimen were decreasing, and the sintered specimen which had lower porosity indicated high radial crushing strength. And on the sulfide bronze the feature of the fracture surface depended on tin content. In the specimen with lower tin content the interface between the bronze matrix and sulfide particle became the origin of the fracture, while in the one with higher tin content the Cu-Sn intermetallic compound which was so hard and brittle became the origin of the fracture.

    DOI: 10.2497/jjspm.63.255

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  • Mg多結晶における塑性変形挙動の分子動力学解析 −粒界構造が変形機構に及ぼす影響−

    倉光航平, 齋藤賢一, 宅間 正則, 高橋可昌, 佐藤知広

    日本機械学会講演論文集(関西支部第91期定時総会講演会(メカボケーション学生研究発表セッション)),   No.164-1, (2016), (#P045), pp.   2016.3

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  • 残留応力を考慮した水素環境下におけるα-Fe結晶の変形挙動: 双結晶の原子シミュレーション

    古賀悠, 齋藤賢一, 宅間 正則, 高橋可昌, 佐藤知広

    日本機械学会講演論文集(関西支部第91期定時総会講演会(メカボケーション学生研究発表セッション)),   No.164-1, (2016), (#P050), pp.   2016.3

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  • 鉄鋼材料の伸線加工に関する分子動力学シミュレーション 〜摩擦モデルの検討およびナノトライボロジー的考察〜

    仁木貴之, 齋藤賢一, 宅間 正則, 高橋可昌, 佐藤知広

    日本機械学会講演論文集(関西支部第91期定時総会講演会(メカボケーション学生研究発表セッション)),   No.164-1, (2016), (#P051), pp.   2016.3

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  • Effects of sulfur and tin contents on hardness of copper-tin alloy under reduced atmosphere in sintering process Reviewed

    Tomohiro SATO, Yoshimasa HIRAI

    Mechanical Engineering Journal   http://doi.org/10.1299/mej.15-00704   2016.2

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  • Tribological properties of bronze containing micro sized sulfide-application of atomic force microscopy

    Tomohiro Sato, Yoshimasa Hirai, Takehisa Fukui, Hatsuhiko Usami

    Tribology Online   11 ( 2 )   195 - 202   2016

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Japanese Society of Tribologists  

    The present study describes the tribological properties of a bronze alloy used as a sliding interface for operation under dry conditions. Many industrial slide bearings are made from bronze alloy. To achieve easy running-in and enhanced anti-seizure, solid lubricants are added to the alloys. However, it is difficult to simultaneously achieve easy running-in and anti-seizure with one solid lubricant. Thus, the combined effects of a solid lubricant and a dispersed sulfide layer on reducing and stabilizing the friction coefficient were also examined. The tribological properties of the resulting alloy were evaluated with a 3-ball on disc type testing apparatus under dry conditions and in air atmosphere. The surface state of the solid lubricant and dispersed sulfide layer was evaluated by observation of the morphology and phase states via atomic force microscopy. Distinctive features of a phase comprising mixed stiff and soft regular regions on the micrometer scale were observed. These two regular regions are considered to be formed from graphite and sulfide by burnishing. The effect of the dual phase state leads to achievement of both easy running-in and anti-seizure.

    DOI: 10.2474/trol.11.195

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  • Study on damage evaluation of magnesium alloy with acoustic emission method (Discrimination of {1012} and {1011} twin)

    TAKUMA Masanori, YAMASHITA Naoto, MATSUDA Shigeru, ASAGOE Yoshinori, HINOHARA Yuu, OOSUMI Keisuke, SAITOH Kenichi, TAKAHASHI Yoshimasa, SATO Tomohiro

    Transactions of the JSME (in Japanese)   82 ( 839 )   16 - 00027-16-00027   2016

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    <p>Recently, the fuel consumption improvement by weight saving is required in transportation machine. Therefore, Mg alloy is expected as the alternative material of Al alloy and resin material, because it is the lightest in the practical metals and its specific intensity is high. However, twin crystal deformation occurs easily, and there are the two kinds types (i.e. {10<span style="text-decoration: overline;">1</span>2} and {10<span style="text-decoration: overline;">1</span>1} twin crystal) in that deformation. It has been reported that the {10<span style="text-decoration: overline;">1</span>2} twin crystal has work to relax the stress concentration and the {10<span style="text-decoration: overline;">1</span>1} twin crystal has close relation to fracture. Our aim is to evaluate the kinds and the conditions of those types with AE method. In this study, Mg alloy AZ31 was used, and the AE signals of the alloy were detected in compression, tensile and CT test. After that, the analysis of those signals were done. From the results obtained under this experimental conditions, the following things became clear. (1) The frequency components near 250, 550 and 850 kHz are caused by slip, twin crystal deformation and crack growth respectively. (2) It is possible that the two kinds crystal deformation types are discriminated by the identification standards decided by the AE count and fractal dimension Fd of the detected signals.</p>

    DOI: 10.1299/transjsme.16-00027

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  • Molecular dynamics study on ductile behavior of SiC during nanoindentation

    Takuya Hanashiro, Ken-Ichi Saitoh, Tomohiro Sato, Kenji Nishimura, Masanori Takuma, Yoshimasa Takahashi

    Tribology Online   11 ( 2 )   183 - 188   2016

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    In order to clarify the plastic deformation mechanism of silicon carbide in cubic phase (3C-SiC), molecular dynamics (MD) simulations are performed on the nanoindentation using a spherical indenter. Transition from elastic deformation to plastic deformation has been confirmed by the phenomenon called pop-in in the load-displacement curves during nanoindentation. Dislocations on {1 1 1} slip planes are found during indentation. In order to analyze internal defects, common neighbor analysis (CNA) is slightly modified so that it is suitable for the analysis of slips of zinc-blend structure. In our method, the CNA is applied separately to sub-lattice of Si or C in the same SiC. By this method, structural changes are confirmed in a region with the shape of square pyramid when the pop-in behavior occurs. By measuring the atomic distances along the region of misalignment, it was confirmed that there is certainly atomic sliding by crystalline slip. Furthermore, it is found that, with increase of loading, dislocation loops spread along {1 1 1} slip planes.

    DOI: 10.2474/trol.11.183

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  • Interfacial fracture strength property of micro-scale SiN/Cu components Reviewed

    Yoshimasa Takahashi, Kazuya Aihara, Itaru Ashida, Masanori Takuma, Kenichi Saitoh, Tomohiro Sato, Kimitaka Higuchi, Yuta Yamamoto, Shigeo Arai, Shunsuke Muto

    21ST EUROPEAN CONFERENCE ON FRACTURE, (ECF21)   2   1367 - 1374   2016

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    The strength against fracture nucleation from an interface free-edge of silicon-nitride (SiN)/copper (Cu) micro-components is evaluated. A special technique that combines a nano-indenter specimen holder and an environmental transmission electron microscope (E-TEM) is employed. The critical load at the onset of fracture nucleation from a wedge-shaped free-edge (opening angle: 90 degrees) is measured both in a vacuum and in a hydrogen (H-2) environment, and the critical stress distribution is evaluated by the finite element method (FEM). It is found that the fracture nucleation is dominated by the near-edge elastic singular stress field that extends about a few tens of nanometers from the edge. The fracture nucleation strength expressed in terms of the stress intensity factor (K) is found to be eminently reduced in a H-2 environment. Copyright (C) 2016 The Authors. Published by Elsevier B.V.

    DOI: 10.1016/j.prostr.2016.06.174

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  • Tribological properties of bronze containing micro sized sulfide-application of atomic force microscopy

    Tomohiro Sato, Yoshimasa Hirai, Takehisa Fukui, Hatsuhiko Usami

    Tribology Online   11 ( 2 )   195 - 202   2016

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    The present study describes the tribological properties of a bronze alloy used as a sliding interface for operation under dry conditions. Many industrial slide bearings are made from bronze alloy. To achieve easy running-in and enhanced anti-seizure, solid lubricants are added to the alloys. However, it is difficult to simultaneously achieve easy running-in and anti-seizure with one solid lubricant. Thus, the combined effects of a solid lubricant and a dispersed sulfide layer on reducing and stabilizing the friction coefficient were also examined. The tribological properties of the resulting alloy were evaluated with a 3-ball on disc type testing apparatus under dry conditions and in air atmosphere. The surface state of the solid lubricant and dispersed sulfide layer was evaluated by observation of the morphology and phase states via atomic force microscopy. Distinctive features of a phase comprising mixed stiff and soft regular regions on the micrometer scale were observed. These two regular regions are considered to be formed from graphite and sulfide by burnishing. The effect of the dual phase state leads to achievement of both easy running-in and anti-seizure.

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  • セルロースナノファイバーの分子動力学解析 —高強度をもたらす水素結合ネットワークの解明—

    咲本大輔, 齋藤賢一, 宅間 正則, 高橋 可昌, 佐藤知広

    日本機械学会 講演論文集 (第28回計算力学講演会(CMD2015))   No.15-19, (2015),(CD-ROM #047)   2015.10

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  • SiCの転位挙動における温度依存性のMD法による検討

    花城卓也, 齋藤賢一, 西村憲治, 宅間 正則, 高橋 可昌, 佐藤知広

    日本機械学会 講演論文集 (第28回計算力学講演会(CMD2015))   No.15-19, (2015),(CD-ROM #114)   2015.10

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  • Peridynamicsを用いた伸線加工における塑性・破壊モデルの構築

    有馬大貴, 齋藤賢一, 宅間 正則, 高橋 可昌, 佐藤知広

    日本機械学会 講演論文集 (第28回計算力学講演会(CMD2015))   No.15-19, (2015),(CD-ROM #029)   2015.10

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  • 原子論的シミュレーションによるパーライト鋼の伸線加工時の挙動解析 ---微視組織および相変態の検討---

    齋藤賢一, 鮫島洋平, 宅間 正則, 高橋 可昌, 佐藤知広

    平成27年度(第46回)塑性加工春季講演会 講演論文集   pp.93-94   2015.5

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  • Evaluation of generation conditions for phase transformations of Ti-Ni alloy with AE method(Comparison with results of structural analysis by MD method) Reviewed

    Tomohiro SATO, Masanori TAKUMA, Ken-ichi SAITOH, Yusuke NAKANO, Atsushi MORIKAMI

    Transactions of the JSME (in Japanese)   81巻・825号・1-14頁 ( 825 )   14 - 00436-14-00436   2015.3

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    SMA (Shape Memory Alloy) is utilized in various fields. Especially, Ti-Ni alloy has excellent features than other SMA. And, the alloy has two kinds of the phase transformations of rhombohedral (R) and martensitic (M) phase. Though R-phase transformation is not suitable for large deformation, it has been reported that its function for the cyclic deformation is steady. However, the detailed regulation for evaluating the function deterioration and life of the transformations has not been determined, because each factor affects the complexity to each other. Therefore, the establishment of the technique which evaluates the deterioration by the cyclic deformation is desired. In this study, the features of the AE (Acoustic Emission) signals detected in tensile and cyclic deformation test and the structure analysis results of the simulation with MD (Molecular Dynamics) method were compared. As the results, the following things became clear. The frequency components of the signals detected by R- and M-phase were about 750 and 350 kHz respectively. The properties of the signals in each phase showed the chaoticity, and they changed with the increase in the stress. The occurrence behaviors and features of the signals changed with the transitions of the hysteresis loop of σ-ε diagram by cyclic deformation. The generation condition of the R-phase seldom changed in the deformation until rearrangement of R-phase. On the other hand, the conditions on R- and M-phase decreased in the cyclic deformation until M transformation, because the residual phases disturbed the occurrence of M-phase. By observing the simulation results, it was possible to show the existence of the phase transformations of "Austenite (A) phase→R-phase→M-phase" and "A-phase→M-phase". And the correlations between those generation behaviors and the characteristics changes of the signals were recognized.

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  • Molecular dynamics study on lubrication mechanism in crystalline structure between copper and sulfur Reviewed

    Ken-ichi SAITOH, Tomohiro SATO, Masanori TAKUMA, Yoshimasa TAKAHASHI, Ryuketsu Chin

    Journal of Materials   Vol.2015, (2015), pp.963257,1-13   2015

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  • Effects of dispersed sulfides in bronze under line contact conditions

    T. Sato, Y. Hirai, T. Fukui, K. Akiyama, H. Usami

    PROCEEDINGS OF MALAYSIAN INTERNATIONAL TRIBOLOGY CONFERENCE 2015   Vol.8 pp.1-11.   84 - 85   2015

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    A Sintered bronze system is applied to plane bearings with some lubricants. A bronze-based, sulfide-dispersed Cu-alloy was developed via sintering. Sulfides have some functions that reduce friction resistance, thereby preventing scoring and seizures. Effects of the developed sulfide-containing bronze were investigated using a journal-type testing apparatus in wet conditions; results indicate that the developed bronze may have some anti-scoring properties.

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  • 銅合金Cu2S結晶の温度変化に依存した摺動機構に関する分子動力学解析

    齋藤 賢一, 大津 賢吾, 佐藤 知広, 平井 良政, 宅間 正則, 高橋 可昌

    日本機械学会M&M2014材料力学カンフアレンス   2014.7

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  • Study on damage evaluation of bimetal with lead-free copper alloy Reviewed

    Toshinori SASAKI, Masanori TAKUMA, Ken-ichi SAITOH, Tomohiro SATO, Yoshimasa HIRAI, Shinichi SAYAMA, Yoshimasa TAKAHASHI

    Transactions of the JSME (in Japanese)   Vol.80,No.813,pp1-12   2014

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  • Atomic-modeling and simulation of copper sulfide as micro solid lubricant

    Tomohiro Sato, Yoshimasa Hirai, Takehisa Fukui, Takahiro Ejima, Masanori Takuma, Ken-Ichi Saitoh

    Materials Research Society Symposium Proceedings   1513   42 - 47   2013

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    Many industries have developed new materials as substitutes for lead in solid lubricants. For example, lead bronze, a Cu-Pb alloy that has been used for slide bearings, has been replaced by a Cu alloy containing sulfide. The development of Pb-free Cu alloys has received considerable attention recently. Pb and sulfide are types of solid lubricants
    in particular, MoS 2(molybdenum disulfide) is a popular sulfide lubricant. This study focuses on a material that contains Cu2S. The properties of Cu 2S as a solid lubricant are unknown. First principles (FP) and molecular dynamics (MD) are used to clarify the lubrication mechanism of Cu 2S. The atomic-level stable structure of Cu2S is evaluated by FP under specific sliding conditions. The Cu2S lubrication mechanism is clarified by MD using the FP results for the interatomic potential functions. It is clarified that there is a specific slip system and the Cu-S bonds that exists above and below the layers of the slip system are very strong. © 2013 Materials Research Society.

    DOI: 10.1557/opl.2013.563

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  • Effect of surface groove and graphite penetration on friction properties of sulfide containing copper alloy journal bearing in dry condition

    Yoshimasa Hirai, Tomohiro Sato, Takehisa Fukui, Kento Yamada, Kazuki Tanizawa, Hatsuhiko Usami

    INTERNATIONAL TRIBOLOGY CONFERENCE MALAYSIA 2013   68   37 - 42   2013

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    The present study describes friction properties of sintered copper alloy journal bearing. Sulfide contained copper alloy material studied as the material of the journal bearing. The micro structure of the copper alloy was consisted from micro sized pores and sulfide phase mainly dispersed at the boundary region. For the purpose of friction study, the sliding surface of the journal bearing was in the form of machined texture. A spiral groove was applied to the inner surface of the journal and graphite was occasionally penetrated into the groove. The experiment was carried out using a developed testing apparatus that consists of a spindle driven with an air cooled DC motor and a disc shape bearing holder in air atmosphere without lubricants. The hardened steel shaft having fine ground surface was used as the mating specimen. The results found that the application of spiral groove with graphite penetration was effective to increase the sliding distance up to the occurrence of seizure. In particular, the graphite penetration resulted in significant increase in the sliding distance despite that the decrease in friction coefficient. It was estimated that the application of the groove with graphite penetration restricted the transfer of the journal elements on the mating steel surface. (C) 2013 The Authors. Published by Elsevier Ltd.

    DOI: 10.1016/j.proeng.2013.12.144

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  • 分子動力学法による硫化銅(Cu2S)の結晶構造および摺動機構の解明

    江島貴裕, 齋藤賢一, 宅間 正則, 佐藤知広, 平井良政

    日本材料学会 第17回分子動力学シンポジウム   講演論文集(USB-data), P35   2012.6

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  • Atomic-level analysis of copper sulfide (Cu2S): Crystalline structure and sliding characteristics

    Takahiro Ejima, Ken-ichi Saitoh, Noboru Shinke, Takuma Masanori, Tomohiro Sato, Yoshimasa Hirai

    No.54, pp.23-33   2012.3

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  • 硫化銅(Cu2S)の摺動特性に関する分子動力学解析

    江島貴裕, 齋藤賢一, 宅間正則, 佐藤知広, 平井良政

    日本機械学会関西支部第87期定時総会講演会   No.124-1, pp.(4-)12   2012.3

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  • Tribological Properties of Porous Cu Based Alloy Containing Nano Sized Sulfide Particles

    Tomohiro Sato, Yoshimasa Hirai, Takehisa Fukui, Kazuki Tanizawa, Hatsuhiko Usami

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   6 ( 1 )   158 - 167   2012

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    The present study describes tribological properties of copper based porous alloy containing nano-sized sulfide particles. The porous alloy was fabricated with sintering on the steel plate using the developed powders consisted from Cu with dispersed sulfides. The micro structure of the alloys consisted from micro sized open pores and sintered particles. The measurement of tribological properties were carried out with a ring on disc testing apparatus with a steel ring as the mating specimen. First, comparison of friction behavior between the developed material and the lead-bronze alloy used as traditional materials for bearings are evaluated. As results, the friction coefficient of the developed material was stable and lower than that of the lead one and larger adhesion resulted in the higher friction resistance was found on the ring surface. In order to enhance porous structure on the reduction and stabilization of the friction resistance, graphite powder was penetrated into the pores by rubbing with the graphite rod. It was found that the further reduction of friction resistance was obtained.

    DOI: 10.1299/jamdsm.6.158

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  • Effects of penetrated graphite on tribological properties of copper based journal bearing

    Kazuki Tanizawa, Hatsuhiko Usami, Tomohiro Sato, Yoshimasa Hirai, Takehisa Fukui

    EMERGING TECHNOLOGY IN PRECISION ENGINEERING XIV   523-524   805 - +   2012

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    Tribological properties of copper based porous alloy with penetrated micro size graphite layer were evaluated using a ring on disc testing apparatus in dry condition. A shot peening treatment was applied to ensure the dimple for the graphite penetration. Specimens with various area fraction of the graphite layer were prepared. It was found that the friction coefficient and the wear loss decreased with the increase in the area fraction. However, the decrease of the friction and the wear loss became smaller at excess graphite area fraction.

    DOI: 10.4028/www.scientific.net/KEM.523-524.805

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  • Sintering and tribological properties of lead-free bronze alloy for friction materials

    Tomohiro Sato, Yoshimasa Hirai, Toru Maruyama, Takeshi Kobayashi

    POWDER METALLURGY   54 ( 1 )   10 - 12   2011.2

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    DOI: 10.1179/003258911X12959522442673

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  • Characteristic Deformation and Structural Changes of Ni-Ti alloys by Molecular Dynamics; Phase Transformation and Amorphization

    Tomohiro Sato, Ken-ichi Saitoh, Noboru Shinke

    Shape Memory Alloys: Manufacture, Properties and Applications (ed. H.R.Chen, )   pp.231-246, Nova Science Publi   2010

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  • Atomic-level Structural Change in Ni-Ti Alloys under Martensite and Amorphous Transformations Reviewed

    Ken-ichi SAITOH, Keisuku KUBOTA, Tomohiro SATO

    Technische Mechanik   Vol.30, No.1-3, pp.269-279   2010

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  • Ni-Ti合金における応力誘起非品質化および結晶変態の原子レベル解析

    久保田啓介, 齋藤賢一, 佐藤知広, 新家 昇

    日本機械学会2008年度年次大会   (1), 11-12   2008.8

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  • Atomistic modelling of reversible phase transformations in Ni-Ti alloys: A molecular dynamics study

    T. Sato, K. Saitoh, N. Shinke

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   481   250 - 253   2008.5

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    Ni-Ti thin films for micro actuators is the focus of intense research. Such films have precipitates with a unique micro-structure. By molecular dynamics simulation (MDS) using embedded-atom potentials, we construct nano-sized Ni-Ti model systems including plate shape precipitates. First, the energetics of such plate precipitates is evaluated. The simulations show that there is a lower energy precipitate which is actually observed in experimental studies. Second, uniaxial-tensile loading is conducted for the MDS model which contains the precipitate. For the relaxed state, the precipitate sufficiently matches the Ni-Ti parent phases at the interfaces, whereas during the loading, mismatch as well as nucleation of martensite occurs there. (C) 2007 Published by Elsevier B.V.

    DOI: 10.1016/j.msea.2007.01.190

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  • 616 Atomic-level analysis of amorphization and crystalline transformation in Ni-Ti alloy

    KUBOTA Keisuke, SAITOH Ken-ichi, SATOH Tomohiro, SHINKE Noboru

    The proceedings of the JSME annual meeting   2008   11 - 12   2008

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    The mechanism of stress-induced amorphization and martensite transformation is analyzed at an atomic level by using molecular dynamics (MD). Calculation model for MD is made of Ni-Ti (B2 structure) alloy which has edge cracking. The framework of modified embedded atom method (MEAM) potential and its approximated expression are attempted to be adopted in order to reproduce amorphous structure. The pentagonal bipyramid which is used as one of noncrystalline models is focused on, and short-range order of amorphous is distinguished by detecting indices of (1551) and (1541) for bond pairs defined in CNA. Martensite phase (B19' structure) is distinguished by the analysis of lattice constants of primitive crystal unit. As a result, it is found that amorphous structure has concentrated on nearby crack. The change of shear component in stress tensor shows very similar trend for change of amorphization ratio defined here. On the other hand, the results show that tensile stress plays an important role in martensite transformation.

    DOI: 10.1299/jsmemecjo.2008.1.0_11

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  • モンテカルロ法を用いたNi-Ti合金に関する相変態現象の解析

    米田知哉, 齋藤賢一, 新家 昇, 佐藤知広

    日本機械学会関西支部第82期定時総会講演会講演論文集   074-1, 612   2007.3

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  • Molecular dynamics study on morphology and mechanical properties of atomic-cluster-assembled structure

    Ken-Ichi Saitoh, Noboru Shinke, Syuuichi Nagase, Tomohiro Sato

    Zairyo/Journal of the Society of Materials Science, Japan   55 ( 8 )   746 - 753   2006.8

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    Morphology and mechanical properties of atomic-cluster-assembled structures, which are generated from nanosize cluster of metallic atoms, are studied by using molecular dynamics with many-body interatomic potential. Generation of the structures is carried out by configuring copper clusters (made up of 683 atoms) in regular array with initial approaching velocities. It is confirmed that one-dimensional, two-dimensional, and three-dimensional structures can be designed and fabricated from clusters. Shape of the structures is largely dependent on initial velocities, that is, initial kinetic energy attributed to clusters. In two-dimensional model with low approaching velocity, some structures have voids and show large surface ratio. Subsequently, tensile test is conducted on the structures. By chucking two end regions and pulling them in opposite direction, tensile straining of the structures is carried out. Strain energy calculated from stress-strain curve over testing process can be used as an effective evaluation value for distinguishing ductile structures from brittle structures. On the other hand, tensile strength (maximum stress) does not have marked variation as to the shape of structures. It is found that, in two-dimensional structures, existence of voids enhances the brittleness. It is because, when the structure has void inside, stacking faults appear and disappear more easily than when the structure gets rid of void by clusters being packed closely. Strain rate, as another factor which may alter the mechanical properties, is diminished from that of principal result to smaller value, corresponding to tensile velocity from 100 m/s to 5 m/s. Though the tensile strength and strain energy are influenced slightly by strain rate, they are always low for the structure with voids.

    DOI: 10.2472/jsms.55.746

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  • Molecular dynamics study on microscopic mechanism for phase transformation of Ni-Ti alloy

    T Sato, K Saitoh, N Shinke

    MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING   14 ( 5 )   S39 - S46   2006.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    Molecular dynamics simulation (MDS), using the embedded atom method for interatomic interactions, is performed to reveal the microscopic mechanism of stress-induced martensitic transformation of Ni - Ti alloys. Stress-induced martensitic transformation was observed for tensile simulation using four different strain rates. The relationship between stress and martensite ratio does not depend on the strain rate. Investigation of the results of MDS for the transformation pathway makes it clear that there are multiple pathways between the parent phase and the martensite phase regardless of the strain rate. Multiple pathways appear owing to differences in the relationship ( angle) between the tensile direction and the specific lattice lengths of the parent or martensite unit cell. Increase and decrease in the martensite ratio during tensile simulation varies according to the pathways, depending on the strain rate.

    DOI: 10.1088/0965-0393/14/5/S05

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  • Atomic dynamics and energetics of martensitic transformation in nickel-titanium shape memory alloy

    Ken-ichi Saitoh, Tomohiro Sato, Noboru Shinke

    MATERIALS TRANSACTIONS   47 ( 3 )   742 - 749   2006.3

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    Microscopic mechanism of martensitic transformation in nickel (Ni)-titanium (Ti) alloy is investigated by molecular dynamics (MD) simulation using embedded atom method (EAM) potentials. The computational parallelepiped specimen with nano-size dimension is surrounded by Ti-terminated free surfaces and constrained regions for loading. The detection method of martensite phase is newly exploited. The crystalographic B19' monoclinic crystal form can be identified as martensite phase by checking up atomic lengths and angles of neighborhood and by comparing them with possible values of lattice parameters already proposed. In tensile loading, the specimen shows a kind of stress-induced transformation from parent phase (B2 structure) to martensite phase (B19' structure). Outbreak of martensitic transformation occurs immediately after stress reaches maximum value. In outbreak of martensite, distortion of unit structure is observed as an actual change in atomic coordinates. It is found that there are two major transformation paths both resulting in martensite structure, each of which has contrary sequence of changes in atomic length or angle. There is also the other route of atomic movement for completing martensitic transformation with relatively long-range atomic migration. The EAM potential used in the present study is discussed as to crystalline energies of periodic B2 or B19' unit structures. Dynamic energies in transformation are also obtained from MD results and they show that there are energy barriers in martensitic transforming. Static evaluation of energy, on the assumption of uniform transformation, is carried out and is compared with energy change obtained by MD method.

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  • Molecular Dynamics Study on Microscopic Mechanism forStress Induced Phase Transformation of Ni-Ti Alloy Reviewed

    Tomohiro SATO, Ken-ichi SAITOH, Noboru SHINKE

    Transactions of the JSME (A)   72巻, 714号, pp.232-238 ( 714 )   232 - 238   2006.2

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    Ni-Ti alloy, one of well-known shape memory alloys, attracts attention by their functional advantages in thin films or their nanostructures. Stress induced martensitic transformation (SIMT) is recognized as a principal deformation mechanism, while its atomistic view on nucleation or prematensitic transformation is left unrevealed. Therefore, we computationally investigate microscopic mechanism of SIMT in Ni-Ti alloy using molecular dynamics simulation (MDS) with embedded atom metod (EAM) potential function. The Ni-Ti simulation model consisted of 19 404 atoms and surrounded by free surfaces is subjected to loading and unloading with appropriate structural relaxations. To identifying crystalline phase changes from B 2 (parent) to B 19' (martensite) in the alloy under loading, we monitor lattice parameters, ratio of two lattice parameters, and their angles from instantaneous atomic positions. We define the martensite phase by specifying possible combination of the parameters according to literatures. In loading process, with rapid stress descent, the MDS model deforms and shows maximal ratio of martensite phase. We find that there are two major paths of atomic configurational change from B 2 to B 19' in these martensite structures and there is also another kind of long-range atomic migration whose distance is larger than single lattice constant. The separation into these multiple paths is caused by discrepancy in angles between interatomic connecting line in unitcell and the tensile direction. It is also find that each paths have characteristic activation energies during configurational change (i.e. during phase transformation). It is ensured that SIMT is microscopically constructed by various types of structural changes and their energetics.

    DOI: 10.1299/kikaia.72.232

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  • Ni-Ti合金の相変態シミュレーションにおける原子間ポテンシャルの影響

    齋藤賢一, 佐藤知広, 新家 昇, 佐々木利幸

    日本機械学会関西支部第81期定時総会講演論文集   064-1,(10-)7   2006

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  • Ni-Ti合金の欠陥・析出物に関するミクロ計算力学モデル

    佐藤知広, 米田知哉, 齋藤賢一, 新家 昇, 久保田啓介

    日本機械学会計算力学講演会講演論文集   Vol. 19, 373-374   2006

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  • Ni-Ti合金の析出物による局所変形と相変態の関係-分子動力学的研究

    佐藤知広, 齋藤賢一, 新家 昇

    日本計算工学会講演会論文集   11, 597-600   2006

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  • Ni-Ti合金の相変態に欠陥が及ぼす影響:分子動力学法による検討

    佐藤知広, 齋藤賢一, 新家昇, 高橋明紘

    日本機械学会講演論文集(第18回計算力学講演会)   05-2, 481-482   2005.11

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  • 分子動力学法によるNi-Ti合金のマルテンサイト変態経路の観察

    齋藤 賢一, 佐藤知広, 新家昇, 秋山賢二

    日本機械学会講演論文集   No.054-1, (2005), pp.(5-)11-12   2005.3

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  • 分子動力学法を用いたNi-Ti合金に対する相変態の観察と構造解析 Reviewed

    Tomohiro SATO, Ken-ichi SAITOH, Noboru SHINKE

    J. Soc. Mat. Sci., JAPAN   54巻, 2号,pp.193-200.   2005.2

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  • Observation of phase transformation and structural analysis for Ni-Ti alloy by molecular dynamics simulation Reviewed

    Tomohiro Sato, Ken-Ichi Saitoh, Noboru Shinke

    Zairyo/Journal of the Society of Materials Science, Japan   54 ( 2 )   193 - 200   2005

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Society of Materials Science Japan  

    An SMA (shape memory alloy) is a functional material with a unique property known as the shape memory effect, or superelasticity. Microscopically, the mechanical actuation of this effect is based on reversible transformation between different crystal phases. To clarify the atomistic mechanism in SMA, we perform molecular dynamics simulation (MDS) of phase transformations for a Ni-Ti alloy, a typical alloy used for engineering SMAs. EAM potential, which can produce both B2 and B19' structures (stable crystal phases of Ni-Ti), is adopted to model the interatomic interaction of the nickel and titanium atomic systems. Two different-sized MDS models are constructed with unit cell structures of B2 phase. These structures are surrounded by free surfaces and constrained regions so as to be subjected to uniaxial tensile loading. A series of reversible processes likely to occur in SMA, including loading, unloading, heating, and cooling, is reproduced by corresponding stages of the MDS. Phase transformation is thought to be observable by detecting the local interatomic distances and bonding angles peculiar to B19' structure (martensite). During tensile loading simulations, the martensite crystal structure is always observed, having transformed from the B2 structure. At a large strain, models exhibit a rapid propagation of local lattice distortions accompanied by the formation of martensite. In unloading simulations, the larger model contains relatively less martensite than the smaller model. The discrepancy with regards to model size may depend on a different degree of constraint strength. Reverse transformation (from B19' to B2) occurs mainly in the subsequent heating stage, in which the stress is observed to increase under constant residual strain.

    DOI: 10.2472/jsms.54.193

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  • Molecular Dynamics Simulation on Phase Transformation of Ni-Ti Alloy

    No.04-40,177-178   2004.11

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  • Molecular dynamics study on nano structure and shape-memory property of Ni-Ti alloy Reviewed

    Tomohiro SATO, Ken-ichi SAITOH, Takuya UEHARA, Noboru SHINKE

    Trans.Mat.Res.Soc.J   Vol.29, No.8, pp.3615-3618   2004.8

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  • Molecular Dynamics Study on Shape Memory Mechanism in Ni-Ti alloy

    pp.49-54   2004.5

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  • Molecular Dynamics Observation on Phase Transformation from Inhomogeneity in Ni-Ti Alloy

    SAITOH Ken-ichi, Tomohiro Sato, Noboru Shinke

    No.044-1, pp.(3-)17-18.   2004.3

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  • ナノ単結晶Ni-Ti合金における局所構造変化の分子動力学解析

    齋藤 賢一, 佐藤知広, 新家 昇

    日本機械学会講演論文集   No.03-26, (2003), pp.483-484   2003.11

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  • 分子動力学法によるナノサイズNi-Ti合金の挙動解析と原子間ポテンシャルの評価

    齋藤 賢一, 佐藤知広, 新家 昇

    日本機械学会講演論文集   No.03-1, (VI), pp.43-44   2003.8

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  • Mechanism of Phase Transformation in Nanosize Ni-Ti Alloy: Construction of Molecular Dynamics Model

    SAITOH Ken-ichi, Tomohiro Sato, Noboru Shinke

    52-57   2003.5

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  • 分子動力学法を用いたNi-Tiナノ合金の変形挙動に関する研究

    齋藤 賢一, 佐藤知広, 新家昇

    日本機械学会講演論文集   No.034-1, pp.(7-)13-14   2003.3

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Books

  • Non-firing Solidification of Ceramics Using Powder Surface Activation by Attrition Reviewed

    Masayoshi Fuji, Hadi Sena, Tomohiro Sato, Chika Takai

    Journal of the Society of Powder Technology, Japan  2020.4 

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  • Sulfide dispersed bronze Reviewed

    SATO,Tomohiro( Role: Contributor)

    IntechOpen,Design and Manufacturing(ex.Sinering)  2019.5 

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  • Improvement of Manufacturing Process Technology of Ceramics

    Chika Yamashita TAKAI, Masayoshi FUJI, Tomohiro SATO, Razavi-Khosroshahi Hadi, Yuki NAKASHIMA, Seizo OBATA, Kenji TATEISHI

    Tribologist  2018.12 

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  • 焼結金属のトライボロジー技術

    佐藤 知広( Role: Sole author)

    月刊トライボロジー  2018.9 

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  • 数値解析と表面分析によるトライボロジーの解明と制御

    佐藤知広( Role: Joint author)

    テクノシステム  2018.3 

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  • Technical Trends on "Lead-free" -Based on Cu-alloy Materials-

    SATO,Tomohiro( Role: Sole author)

    Engineering & technology  2016.11 

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  • Characteristic Improvement of Sintered Materials by Surface Texturing

    Tomohiro SATO( Role: Sole author)

    J.Jpn.Soc.Tribologists  2015.3 

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  • 銅合金摺動部材の開発―固体潤滑成分・テクスチャリングの適用

    佐藤知広( Role: Sole author)

    潤滑経済  2012.12 

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  • ナノダイヤモンド配合黒鉛のトライボロジー Reviewed

    佐藤知広( Role: Sole author)

    トライボロジスト  2012.10 

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  • Sintering and tribological properties of lead-free bronze alloy for friction materials Reviewed

    SATO,Tomohiro, HIRAI,Yoshimasa, MARUYAMA,Toru, KOBAYASHI,Takeshi

    Powder Metallurgy  2011.1 

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  • Characteristic Deformation and Structural Changes of Ni-Ti alloys by Molecular Dynamics; Phase Transformation and Amorphization

    Tomohiro SATO, Ken-ichi SAITOH, Keisuku KUBOTA, Noboru SHINKE( Role: Joint author)

    Nova Science Publishers,Shape Memory Alloys: Manufacture, Properties and Applications , (ed. H.R.Chen)  2010 

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MISC

  • 粉末冶金技術をベースとした新材料開発

    佐藤 知広

    MOBIO-Cafe ここからはじまる産学連携『関西大学』   2022.12

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  • 機械工学年鑑2022、6.機械材料・材料加工

    佐藤 知広

    機械工学年鑑2022、6.機械材料・材料加工、6.3評価、6.3.3トライボロジー   https://www.jsme.or.jp/kikainenkan2022/chap06/   2022.4

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  • オーダーメイド可能な 3次元造形用金属-樹脂系複合材料

    佐藤 知広

    2021.8

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  • オーダーメイド材料設計のための材料およびプロセス開発

    佐藤 知広

    NEDO   2021.8

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  • 銅含有樹脂を用いた3D造形による材料開発と抗菌性の検証

    佐藤知広

    はりま産学交流会 創造例会   2020.10

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  • Lubricity of synthesized sulfides

    SATO,Tomohiro, ISHIKAWA,Shuhei, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    Japan-Taiwan Tribology Symposium 2019 (JTTS 2019)   Proceedings,pp11-12.   2019.9

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  • 高温での使用も可能な摺動材料の開発

    佐藤知広

    (イノベーションジャパン2017・大学見本市)   2017.8

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  • 銅合金と硫化物による焼結部材の 機能発現について

    佐藤知広

    粉体工学会若手勉強会   2017.8

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  • 硫化物を中心とした材料の機能発現に関する計算および実験的アプローチ

    佐藤知広

    トライボロジー学会分子シミュレーション研究会   2017.3

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  • Development of high performance materials using powder metallurgy

    SATO,Tomohiro

    2016.8

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  • P047 Evaluation of strength against interfacial crack initiation from free-edges in micro-components : effect of free-edge shape

    AIHARA Kazuya, TAKAHASHI Yoshimasa, TAKUMA Masanori, SAITOH Ken-ichi, SATOH Tomohiro

    2016 ( 91 )   421 - 421   2016.3

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

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  • M319 Study on effect of excess Mg on static and fatigue strength properties of A6061-T6

    KAWATA Yuji, TAKAHASHI Yoshimasa, TAKUMA Masanori, SAITOH Ken-ichi, SATOU Tomohiro

    2016 ( 91 )   271 - 271   2016.3

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

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  • P046 Static and fatigue strength properties of A6061-T6-based new Al alloys

    KITA Shuzaburo, TAKAHASHI Yoshimasa, TAKUMA Masanori, SAITOH Ken-ichi, SATO Tomohiro

    2016 ( 91 )   420 - 420   2016.3

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  • M311 Gaga-cycle fatigue properties of A6061-T6-based new Al alloy : effect of environment

    WADA Takuya, TAKAHASHI Yoshimasa, TAKUMA Masanori, SAITOH Kenichi, SATO Tomohiro

    2016 ( 91 )   263 - 263   2016.3

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  • トライボマテリアルとしての銅合金加工プロセスと摩擦特性の評価

    佐藤知広

    第23回機械材料・材料加工技術講演会(M&P2015)   2015.11

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  • 摺動部材ブロベアの開発-固体潤滑成分の適用

    佐藤知広, 平井良政

    クリモト技報   63 ,28-33   2014.1

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  • 銅合金基焼結体の摩擦特性に及ぼすテクスチュアの効果

    佐藤知広

    ターボ機械協会トライボロジー研究分科会 第6回研究会   2013.7

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  • 銅合金摺動部材の開発―固体潤滑成分・テクスチャリングの適用

    佐藤知広

    日本トライボロジー学会テクスチャリング研究会   2012.7

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  • 銅合金摺動部材の開発

    佐藤知広

    日本建設機械施工協会関西支部,第237回摩耗対策委員会   2012.5

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  • 928 Study on Damage Evaluation of Bimetal using Lead-free Bronze

    SAYAMA Shinichi, SHINKE Noboru, TAKUMA Masanori, SAITO Kenichi, TAKAHASHI Yoshimasa, SATO Tomohiro, HIRAI Yoshimasa

    2012 ( 87 )   "9 - 28"   2012.3

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  • 非鉄金属(機能材料)の実験とシミュレーション

    佐藤知広

    日本技術士会金属部会講演会   2012.2

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  • 摩擦特性に優れた鉛フリー銅合金の研究・開発−硫化物分散型銅合金のしゅう動材料としての適用−

    佐藤知広, 平井良政

    クリモト技報   60,9-13   2011.1

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  • Microscopic Behavior and Development of Shape-memory Materials (advanced Study by Computer Simulations)

    Saitoh Ken-ichi, Sato Tomohiro, Shinke Noboru

    Engineering & technology   13 ( 3 )   43 - 48   2005.11

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    Language:Japanese   Publisher:Kansai University  

    CiNii Books

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Presentations

  • Molecular dynamics method for surface reaction of silica as non-firing ceramic model

    KUBOTA,Atsuto, SATO,Tomohiro, SAITOH,Ken-ichi, FUJI,Masayoshi, TAKAI,Y,Chika, SENA,hadi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    2020.12 

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    Event date: 2020.12

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  • Simulated generation of sintered material surface image and verification of superiority to discrimination problems(Applying Generative Adversarial Network)

    KURIBAYASHI,Daiki, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JSME M and P 2020 Online  2020.11 

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    Event date: 2020.11

    Venue:Online  

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  • Molecular dynamics method for reaction at silica interface as non-firing ceramic model

    KUBOTA,Atsuto, SATO,Tomohiro, SAITOH,Ken-ichi, FUJI,Masayoshi, TAKAI,Y,Chika, SENA,hadi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JSME M and P 2020 Online  2020.11 

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    Event date: 2020.11

    Venue:Online  

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  • Evaluation of sliding properties of Cu-Ni-Sn-S alloy ~influence of sulfide change by heat treatment~

    ASADA,Hiroki, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JAST 2020 Fall meeting Beppu(Online)  2020.11 

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    Event date: 2020.11

    Venue:Online  

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  • Evaluation of sulfides as solid lubricant -Lubricity of compounded sulfides -

    SATO,Tomohiro, ISHIKAWA,Shuhei, Okuno,Masahiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    International Conference on Engineering Tribology and Applied Technology  2020.11 

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    Event date: 2020.11

    Venue:Online(Conference was held in Taiwan,hybrid session)  

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  • Evaluation of mechanical properties in heat treatment of sulfide-dispersed Ni bronze alloy -Effect of sulfur dispersion-

    ASADA,Hiroki, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    2020.10 

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    Event date: 2020.10

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  • Cu-Ni-Sn-S 合金の機械的特性評価 ~熱処理及び表面制御に よる影響~

    浅田宏樹, 佐藤知広, 齋藤賢一, 宅間正則, 高橋可昌

    日本機械学会 2020年度年次大会  2020.9 

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    Event date: 2020.9

    Venue:オンライン  

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  • 合成硫化物を用いた接触センサの開発

    吉原雅貴, 佐藤知広, 齋藤賢一, 宅間正則, 高橋可昌

    日本機械学会 2020年度年次大会  2020.9 

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    Event date: 2020.9

    Venue:オンライン  

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  • PLA 系樹脂を用いた FDM 造形物の機械的特性評価

    若林智也, 佐藤知広, 齋藤賢一, 宅間正則, 高橋可昌

    日本機械学会 2020年度年次大会  2020.9 

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    Event date: 2020.9

    Venue:オンライン  

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  • 硫化物複合化による摩擦・摩耗特性への影響

    奥野雅大, 佐藤知広, 齋藤賢一, 宅間正則, 高橋可昌

    日本機械学会 2020年度年次大会  2020.9 

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    Event date: 2020.9

    Venue:オンライン  

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  • Study on improving frictional performance by complex sulfides

    OKUNO,Masahiro, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JSME,Kansai  2020.3 

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    Event date: 2020.3

    Venue:Doshisya Uniy.Kyoto,Japan  

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  • Characteristics evaluation of sliding members using 3D printing technology

    WAKABAYASHI,Tomoya, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JSME,Kansai  2020.3 

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    Event date: 2020.3

    Venue:Doshisya Univ.,Kyoto,Japan  

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  • Development of thermoelectric conversion element using synthetic sulfide

    YOSHIHARA,Masaki, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JSME,Kansai  2020.3 

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    Event date: 2020.3

    Venue:Doshisya Univ.Kyoto,Japan  

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  • Molecular Dynamics Modelling of Non-firing Solids on SiO2 Interfaces-

    SATO,Tomohiro, KUBOTA,Atsuto, SAITOH,Ken-ichi, FUJI,Masayoshi, TAKAI,Y,Chika, RAZAVI,Hadi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    2019.12 

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    Event date: 2019.12

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  • 金属含有樹脂系複合材料の摩擦特性評価-3Dプリンティング技術の活用-

    松竹祐哉, 若林智也, 佐藤知広, 齋藤賢一, 宅間正則, 高橋可昌

    日本機械学会  2019.11 

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    Event date: 2019.11

    Venue:福井  

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  • 固体潤滑剤を含む銅系焼結合金の摩擦特性評価

    相茶将紀, 佐藤知広, 齋藤賢一, 宅間正則, 高橋可昌

    日本機械学会  2019.11 

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    Event date: 2019.11

    Venue:福井  

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  • 硫化物分散Cu-Sn合金の熱処理と表面改質による摩擦特性評価

    浅田宏樹, 佐藤知広, 齋藤賢一, 宅間正則, 高橋可昌, 宇佐美初彦

    日本機械学会  2019.11 

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    Event date: 2019.11

    Venue:福井  

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  • Non-firing process of active particle surface - Molecular dynamics simulation of silica -

    SATO,Tomohiro, KUBOTA,Atsuto, SAITOH,Ken-ichi, FUJI,Masayoshi, TAKAI,Y,Chika, RAZAVI,Hadi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    2019.10 

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    Event date: 2019.10

    Venue:Czech Republic  

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  • Wear Properties Of Vacuum Sintered Copper Alloy As Bimetal

    AICHA,Masanori, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    EURO PM2019 congress & exhibition  2019.10 

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    Event date: 2019.10

    Venue:Maastricht,Netherlands  

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  • Study on Reaction of Silica Surface by Molecular Dynamics Method as the Model of Non-Firing Ceramics

    KUBOTA,Atsuto, SATO,Tomohiro, SAITOH,Ken-ichi, FUJI,Masayoshi, TAKAI,Y,Chika, RAZAVI,Hadi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JAST(Japanese Scociety of Tribologists)  2019.9 

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    Event date: 2019.9

    Venue:Sendai,Japan  

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  • Wear Properties of Sintered Copper Alloy as Bimetal

    AICHA,Masanori, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JAST(Japanese Scociety of Tribologists)  2019.9 

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    Event date: 2019.9

    Venue:Sendai,Japan  

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  • Stress Evaluation of Composites Containing Hard Coating by Peridynamics Theory - on Deformation of Steel Base

    KURIBAYASHI,Daiki, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JAST(Japanese Scociety of Tribologists)  2019.9 

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    Event date: 2019.9

    Venue:Sendai,Japan  

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  • Study on Heat Treatment of Cu-Ni-Sn-S Alloy -Effect of Heat Treatment on Hardness and Sliding Property-

    ASADA,Hiroki, SATO,Tomohiro, NAKANO,Ryo, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JAST(Japanese Scociety of Tribologists)  2019.9 

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    Event date: 2019.9

    Venue:Sendai,Japan  

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  • Performance Evaluation of Three Dimensional Molded Object Using Resin Metal Composite Material -Application to Tribo Material-

    MATSUTAKE,Yuya, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JAST(Japanese Scociety of Tribologists)  2019.9 

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    Event date: 2019.9

    Venue:Sendai,Japan  

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  • Evaluation of Friction Characteristics of Cu-Ni-Sn-S Alloy by Heat Treatment and Surface

    ASADA,Hiroki, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa, USAMI,Hatsuhiko

    2019.9 

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    Event date: 2019.9

    Venue:Iwate,Japan  

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  • Peridynamicsを用いた硬質膜と基材の応力解析

    佐藤知広, 栗林大樹, 齋藤賢一, 宅間正則, 高橋可昌

    東洋大学  2019.9 

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    Event date: 2019.9

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  • Evaluation of Thermoelectric Properties of Sulfides as Solid Lubricants Application to Thermoelectric Conversion Device

    SATO,Tomohiro, TERANISHI,Kai, ISHIKAWA,Shuhei, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JSME  2019.3 

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    Event date: 2019.3

    Venue:Toyo Univ.,Saitama,Japan  

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  • Friction Properties of Sintered Al Bronze containing Dispersed Sulfides

    SATO,Tomohiro, JINGU,Akihiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    2019.2 

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    Event date: 2019.2

    Venue:Pune,India  

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  • Fatigue wear characteristics of iron based sintered materials- Influence of eccentric load -

    INOUE,Masato, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JSME  2018.11 

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    Event date: 2018.11

    Venue:Yamagata Univ.,Yonezawa,Yamagata,Japan  

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  • Strength Evaluation of Three Dimensional Printer Model Using Metal-Containing PLA Resin - Application to Tribo material -

    MATSUTAKE,Yuya, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JSME M&P  2018.11 

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    Event date: 2018.11

    Venue:Yamagata Univ.,Yonezawa,Yamagata,Japan  

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  • Modelling and analysis of SiO2 interfaces of non-firing solids

    SATO,Tomohiro, KUBOTA,Atsuto, SAITOH,Ken-ichi, FUJI,Masayoshi, TAKAI,Y,Chika, RAZAVI,Hadi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    2018.10 

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    Event date: 2018.10 - 2018.11

    Venue:Osaka,Japan  

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  • Molecular Dynamics Study on SiO2 Interfaces as Non-fire Solids

    SATO,Tomohiro, SAITOH,Ken-ichi, FUJI,Masayoshi, TAKAI,Y.,Chika, RAZAVI,Hadi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    2018.10 

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    Event date: 2018.10

    Venue:Columbus,Ohio,USA  

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  • Study on Joining Process of Sulfide Dispered Bronze and Steel Plate

    YAMASAKI,Hirozazu, SATO,Tomohiro, TAKUMA,Masanori, SAITOH,Ken-ichi, TAKAHASHI,Yoshimasa

    2018.10 

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    Event date: 2018.10

    Venue:Columbus,Ohio,USA  

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  • Molecular Dynamics Study on SiO2 Surface as Non-fire Solids

    SATO,Tomohiro, SAITOH,Ken-ichi, FUJI,Masayoshi, TAKAI,Y.Chika, RAZAVI,Hadi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    2018.9 

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    Event date: 2018.9

    Venue:Kuching,Malysia  

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  • Influence of dezincification on characteristics of brass sintered alloy

    AICHA,Masanori, SATO,Tomohiro, TAKUMA,Masanori, SAITOH,Ken-ichi, TAKAHASHI,Yoshimasa

    JSME  2018.9 

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    Event date: 2018.9

    Venue:Kansai Univ.Osaka,Japan  

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  • Evaluation of sliding properties ofCorson Alloy sintered material ~Effect of additives on sliding properties ~

    SAWAI,Yasumasa, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JSME  2018.9 

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    Event date: 2018.9

    Venue:Kansai Univ.Osaka,Japan  

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  • Fundamental study on functionality of synthetic sulfides -Evaluation of metal sulfides as solid lubricant-

    ISHIKAWA,Shuhei, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    2018.9 

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    Event date: 2018.9

    Venue:Kuching,Malysia  

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  • Fundamental Study on Functionality of Synthetic Sulfides

    ISHIKAWA,Shuhei, SATO,Tomohiro, TAKUMA,Masanori, SAITOH,Ken-ichi, TAKAHASHI,Yoshimasa

    JSPM International Conference on Powder and Powder Metallurgy -60th Anniversary-  2017.11 

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    Event date: 2017.11

    Venue:Kyoto University  

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  • Evaluation of sintering process of sinter-resistant copper alloy

    SAWAI,Yasumasa, SATO,Tomohiro, TAKUMA,Masanori, SAITOH,Ken-ichi, TAKAHASHI,Yoshimasa

    JSPM International Conference on Powder and Powder Metallurgy -60th Anniversary-  2017.11 

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    Event date: 2017.11

    Venue:Kyoto University  

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  • Study on joining process of sulfide dispersed bronze and steel plate

    YAMASAKI,Hirozazu, SATO,Tomohiro, TAKUMA,Masanori, SAITOH,Ken-ichi, TAKAHASHI,Yoshimasa

    JSPM International Conference on Powder and Powder Metallurgy -60th Anniversary-  2017.11 

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    Event date: 2017.11

    Venue:Kyoto University  

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  • Molecular Dynamics Study on Silica Surface as Non-fire Solids

    SATO,Tomohiro, SAITOH,Ken-ichi, FUJI,Masayoshi, TAKAI,Y,Chika, HADI,Razavi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    Sustainable Tribology Conference 2017 AMAMI(STCA2017)  2017.10 

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    Event date: 2017.10

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  • Synthesis and Functional Evaluation of Sulfides:Application of Solid Lubricant and Thermoelectric Material

    SATO,Tomohiro, Shuhei Ishikawa, Toshiki Akamune, Ken-ichi Saitoh, Masanori Takuma, Yoshimasa Takahashi

    EURO PM2017 Congress & Exhibiton  2017.10 

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    Event date: 2017.10

    Venue:Milano Congressi Milan, Italy  

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  • Modelling and analysis of SiO2 for Strengthening Mechanisms of non-firing solids

    SATO,Tomohiro, SAITOH,Ken-ichi, FUJI,Msayoshi, TAKAI,Chika, HADI, Razavi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    The 30th Computational Mechanics Conference,JSME CD-ROM  2017.9 

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    Event date: 2017.9

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  • Applied to Vacuum Atmosphere on Sinter-Resistant Cu Alloy

    SATO,Tomohiro, SAWAI,Yasumasa, TAKUMA,Masanori, SAITOH,Ken-ichi, TAKAHASI,Yoshimasa, HIRAI,Yoshimasa

    4th International Conference on Powder Metallurgy in Asia  2017.4 

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    Event date: 2017.4

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  • Evaluation of Thermoelectric Properties of Synthesized Sulfides as Solid Lubricants

    SATO,Tomohiro, AKAMUNE,Toshiki, ISHIKAWA,Shuhei, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    2017.3 

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  • Thermoelectric properties of synthesized sulfides –Adjusted on first principle calculation for screening-

    SATO,Tomohiro, ISHIKAWA,Shuhei, AKAMUNE,Toshiki, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    TMS2017 146th Annual Meeting & Exhibition abstract  2017.2 

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    Event date: 2017.2

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  • Effects of Vacuum Sintering for Cu-alloy -Application of Sulfide Disperesed Cu-alloy-

    SATO,Tomohiro, JINGU,Akihiro, TAKUMA,Masanori, SAITOH,Ken-ichi, TAKAHASHI,Yoshimasa, HIRAI,Yoshimasa

    JSME  2016.11 

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    Event date: 2016.11

    Venue:Waseda Univ.Tokyo,Japan  

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  • Effects of mixing conditions on strength and wear of Cu-Sn system sintered in vacuum atmosphere

    SATO,Tomohiro, JINGU,Akihiro, MURAOKA,Takehiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa, HIRAI,Yoshimasa, USAMI,Hatsuhiko

    Asia-Pacific Conference on Fracture and Strength 2016(APFSC2016)  2016.9 

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    Event date: 2016.9

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  • Tribological Properties of Cu-alloy sintered in Vacuum Atmosphere~Application of Sulphide Dispersed Bronze~

    SATO,Tomohiro, JINGU,Akihiro, TAKUMA,Masanori, SAITOH,Ken-ichi, TAKAHASHI,Yoshimasa, HIRAI,Yoshimasa

    The 17th Nordic Symposium on Tribology - NORDTRIB 2016  2016.6 

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    Event date: 2016.6

    Venue:Hämeenlinna, Finland  

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  • 金属硫化物の熱電特性評価~第一原理計算の適用と合成硫化物の評価~

    佐藤知広, 石川修平, 宅間正則, 齋藤賢一, 高橋可昌

    日本材料学会  2016.5 

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    Event date: 2016.5

    Venue:富山大学  

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  • Development of lead free bronze with sulfide dispersion for sliding members.

    SATO,Tomohiro, HIRAI,Yoshimasa, KOBAYASHI,Takeshi

    World Foundry Congress 2016(WFC2016)  2016.5 

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  • Effects of dispersed sulfides in bronze under line contact conditions

    SATO,Tomohiro, HIRAI,Yoshimasa, FUKUI,Takehisa, AKIYAMA,Keisuke, USAMI,Hatsuhiko

    International Tribology Conference 2015(ITC2015)  2015.11 

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    Event date: 2015.11

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  • 微細硫化物分散青銅鋳造部材の摩擦特性

    平井良政, 佐藤知広, 宇佐美初彦, 秋山敬介

    日本トライボロジー学会  2014.11 

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    Event date: 2014.11

    Venue:盛岡  

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  • 線接触における青銅部材への硫化物物分散効果

    佐藤知広, 平井良政, 宇佐美初彦

    日本トライボロジー学会  2014.11 

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    Event date: 2014.11

    Venue:盛岡  

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  • 円錐ころ軸受の摩擦低減に関する基礎研究

    佐藤知広, 平井良政, 山田健斗, 堀場有真, 宇佐美初彦

    日本トライボロジー学会  2014.5 

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    Event date: 2014.5

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  • 硫化物が分散されたSUJ2の摩擦特性

    佐藤知広, 平井良政, 福井武久, 山田健斗, 宇佐美初彦

    日本機械学会  2013.11 

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    Event date: 2013.11

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  • 硫化物が圧入されたクロム軸受鋼の摩擦特性

    佐藤知広, 平井良政, 山田健斗, 宇佐美初彦

    2013.10 

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    Event date: 2013.10

    Venue:福岡  

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  • Tribological properties of textured copper alloy surface containing micro sized sulfide phase

    SATO,Tomohiro, HIRAI,Yoshimasa, FUKUI,Takehisa, TANIZAWA,Kazuki, USAMI,Hatsuhiko

    World Tribology Congress 2013  2013.9 

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    Event date: 2013.9

    Venue:TorinoItaly  

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  • Tribological properties of copper based alloy journal bearing

    SATO,Tomohiro, HIRAI,Yoshimasa, FUKUI,Takehisa, TANIZAWA,Kazuki, USAMI,Hatsuhiko

    2013.5 

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    Event date: 2013.5

    Venue:Busan,South Korea  

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  • 銅合金基焼結体の摩擦特性に及ぼすテクスチャの効果

    佐藤知広, 宮本武明, 平井良政, 堀場有真, 宇佐美初彦

    2013.5 

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    Event date: 2013.5

    Venue:東京  

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  • Effects of surface machining process on tribological properties of copper based sintered alloy containing nanosiZed su 置 血des

    SATO,Tomohiro, MIYAMOTO,Takeaki, HIRAI,Yoshimasa, TANIZAWA,Kazuki, UsAMI,Hatsuhiko

    JSME  2012.12 

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    Event date: 2012.12

    Venue:Osaka Institute of Technology, Osaka,Japan  

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  • Atomic-modeling and Simulation of Copper Sulfide as Micro Solid Lubricant

    SATO,Tomohiro, HIRAI,Yoshimasa, FUKUI,Takehisa, EJIMA,Takahiro, TAKUMA,Masanori, SAITOH,Ken-ichi

    MRS  2012.12 

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    Event date: 2012.12

    Venue:Boston,USA  

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  • 微細硫化物を分散させた銅合金基焼結体の潤滑摩擦特性に及ぼすテクスチャの効果

    佐藤知広, 宮本武明, 平井良政, 谷澤和紀, 宇佐美初彦

    2012.9 

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    Event date: 2012.9

    Venue:室蘭  

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  • Tribological properties of copper based porous materials with nano size sulfide particle

    SATO,Tomohiro, HIRAI,Yoshimasa, FUKUI,Takehisa, TANIZAWA,Kazuki, USAMI,Hatsuhiko

    JAST  2011.10 

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    Event date: 2011.10 - 2011.11

    Venue:Hiroshima,Japan  

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  • 銅合金に硫化物を均一分散した焼結体の摩擦特性

    佐藤知広, 平井良政, 福井武久, 宇佐美初彦

    2011.5 

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    Event date: 2011.5

    Venue:東京  

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  • Tribological Properties of Porous Cu based Nano Sized Sulfide Particles

    SATO,Tomohiro, HIRAI,Yoshimasa, FUKUI,Takehisa, TANIZAWA,Kazuki, USAMI,Hatsuhiko

    JSME/KSME  2011.4 

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    Event date: 2011.4

    Venue:Gamagori,Japan  

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  • Sintering Processes of Pb-Free Copper Alloy for Friction Materials

    SATO,Tomohiro, HIRAI,Yoshimasa, MARUYAMA,Toru, KOBAYASHI,Takeshi

    EPMA  2010.10 

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    Event date: 2010.10

    Venue:Firenze,Italy  

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  • Friction and Wear Properties of Pb-free Cu Alloy contained Sulfide

    SATO,Tomohiro, HIRAI,Yoshimasa, MARUYAMA,Toru, KOBAYASHI,Takeshi

    JSME,Kansai  2010.3 

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    Event date: 2010.3

    Venue:Kobe Univ.,Hyogo,Japan  

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  • 硫化物分散型鉛フリー銅合金を用いた摺動材料の開発

    平井良政, 佐藤知広(発表者), 丸山徹, 小林武

    日本鋳造工学会関西支部  2009.11 

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    Event date: 2009.11

    Venue:近畿大学  

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  • Atomistic modelling of Ni-Ti alloy on reversible phase transformations : a molecular dynamics study

    SATO,Tomohiro, SAITOH,Ken-ichi, SHINKE,Noboru

    2006.9 

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    Event date: 2006.9

    Venue:Germany  

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  • Molecular dynamics study on microscopic mechanism for phase transformation of Ni-Ti alloy

    SATO,Tomohiro, SAITOH,Ken-ichi, SHINKE,Noboru

    JSMS  2005.8 

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    Event date: 2005.8

    Venue:Osaka,Japan  

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  • Ni-Ti合金における形状記憶メカニズム解明のための分子動力学的研究

    佐藤知広, 齋藤賢一, 新家昇

    日本材料学会  2004.5 

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    Event date: 2004.5

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  • Molecular Dynamics Observation on Phase Transformation from Inhomogeneity in Ni-Ti Alloy

    SATO,Tomohiro, SAITOH,Ken-ichi, SHINKE,Noboru

    2004.3 

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    Event date: 2004.3

    Ni-Ti alloy is used as shape memory alloy. Reversible phase transformation is basic mechanism of shape memory effect(SME). In addition to the mechanism, it is also important that SME begins with a region of inhomogeneity induced by lattice strain. Now we can obsreve on phase transformation from inhomogeneous structure in Ni-Ti alloy by means of molecular dynamics simulation. For interactions in Ni-Ti alloy, we use EAM potential function. In uniaxial tensile test of B2 structured-Ni-Ti monocrystal composed of 2176 atoms, martensite phase is formed around the model surface via stress induced phase transformation. Constrained atoms for giving displacement speed to the specimen prevent deformation from propagating through the model. This is necessary to make martensite phase remain in the model. It shows that inhomogeneity is essential factor for producing martensite phase in this simulation model.

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  • Molecular Dynamics Study on Local Structural Changes of Nano-single Crystal Ni-Ti Alloy

    SATO,Tomohiro, SAITOH,Ken-ichi, SHINKE,Noboru

    2003.11 

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    Event date: 2003.11

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  • Molecular dynamics study on nano structure and shape-memory property of Ni-Ti alloy

    SATO,Tomohiro, SAITOH,Ken-ichi, UEHARA,Takuya, SHINKE,Noboru

    MRS-J  2003.10 

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    Event date: 2003.10

    Venue:Yokohama,Japan  

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  • Molecular Dynamics Study on Behavior and Interatomic Potential of Nano-scale Ni-Ti alloy

    SATO,Tomohiro, SAITOH,Ken-ichi, SHINKE,Noboru

    2003.8 

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    Event date: 2003.8

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  • ナノサイズNi-Ti合金における相変態の機構:分子動力学モデルの構築

    佐藤知広, 齋藤賢一, 新家昇

    日本材料学会  2003.5 

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    Event date: 2003.5

    Venue:工学院大学  

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  • Molecular Dynamics Study on Deformation Behavior of Ni-Ti Nano-alloy

    SATO,Tomohiro, SAITOH,Ken-ichi, SHINKE,Noboru

    JSME,Kansai  2003.3 

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    Event date: 2003.3

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  • 水アトマイズ法で作製された硫化物分散青銅粉末の真空焼結性評価

    今井 優希, 佐藤 知広, 齋藤 賢一, 宅間 正則, 高橋 可昌, 宍戸 了

    2022年度関西学生会卒業研究発表講演会  2023.3 

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    Venue:京都工芸繊維大学  

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  • ガスアトマイズ法で作製された青銅合金粉末の焼結性および焼結体の機械的特性評価

    宮本 航汰, 佐藤 知広, 齋藤 賢一, 宅間 正則, 高橋 可昌, 宍戸 了

    2022年度関西学生会卒業研究発表講演会  2023.3 

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    Venue:京都工芸繊維大学  

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  • Fracture surface observation of hard-sintering Cu alloy

    SATO,Tomohiro, SAWAI,Yasumasa, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    Asia-Pacific Conference on Fracture and Strength, Conference on Structural Integrity and Failure (APCFS & SIF 2022)  2022.12 

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    Venue:The university of Adelaide. Australia  

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  • Evaluation of mechanical properties of metal sulfide dispersion composites

    ONO,Kazuyoshi, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JSME International Conference on Materials and Processing 2022(ICM&P2022)  2022.11 

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    Venue:Okinawa,JAPAN  

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  • Effects of phosphorus on Friction Surface in Sulfide Dispersed Bronze

    GOTO,Kenta, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori

    JSME International Conference on Materials and Processing 2022(ICM&P2022)  2022.11 

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    Venue:Okinawa,JAPAN  

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  • Improvement of thermoelectric performance of mechnochemical manufactured Bi₂S₃ -experimental and simulation studies-

    TANAKA,Masahiro, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JSME International Conference on Materials and Processing 2022(ICM&P2022)  2022.11 

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    Venue:Okinawa,JAPAN  

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  • Peridynamics on surface modified SiO2 based ceramics

    SATAKE,Shintaro, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JSME International Conference on Materials and Processing 2022(ICM&P2022)  2022.11 

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    Venue:Okinawa,JAPAN  

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  • Analysis of images of sulfide dispersion bronze microstructure by machine learning

    WAKAI,Atsushi, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JSME International Conference on Materials and Processing 2022(ICM&P2022)  2022.11 

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    Venue:Okinawa,JAPAN  

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  • Material development for efficiently detecting the contact state of sulfide-based solid lubricants

    SATO,Tomohiro, YOSHIHARA,Masaki, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    2022 JSME-IIP/ASME-ISPS Joint International Conference on Micromechatronics for Information and Precision Equipment (MIPE2022)  2022.8 

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    Venue:Nagoya University, JAPAN  

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  • Evaluation of strength and sliding characteristics of copper containing resin material using powder metallurgy

    YAMASHITA,Taiki, SATO,Tomohiro, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    JSME,Kansai  2022.3 

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    Venue:Online  

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  • Effects of Additives for Hard-Sintering Copper Alloys

    SATO,Tomohiro, SAWAI,Yasumasa, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    The 6th Asian Symposium on Materials and Processing 2022  2022.1 

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    Venue:Online  

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  • Evaluation of Antibacterial and Mechanical Properties of 3D Shaped Metal-containing PLA resin

    SATO,Tomohiro, WAKABAYASHI,Tomoya, SAITOH,Ken-ichi, TAKUMA,Masanori, TAKAHASHI,Yoshimasa

    The 10th International Conference on Leading Edge Manufacturing in 21st Century(LEM21)  2021.11 

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    Venue:Online  

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  • 硫化物分散型Ni青銅合金の熱処理における機械的特性および摩擦特性評価

    佐藤 知広, 浅田 宏樹, 齋藤 賢一, 宅間 正則, 高橋 可昌

    日本銅学会第61回講演大会  2021.10 

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    Venue:オンライン  

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  • 機械学習を用いた金属組織データの解析

    若井 篤志, 佐藤知広, 齋藤賢一, 宅間正則, 高橋可昌

    日本機械学会 関西学生会2020年度学生員卒業研究発表講演会  2021.3 

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    Venue:オンライン  

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  • ペリダイナミクスによる無焼成シリカのマクロ強度評価

    佐竹慎太郎, 佐藤知広, 齋藤賢一, 宅間正則, 高橋可昌

    日本機械学会 関西学生会2020年度学生員卒業研究発表講演会  2021.3 

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    Venue:オンライン  

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  • 焼結銅合金の耐摩耗性向上に関する研究-固体潤滑剤の影響-

    後藤健太, 佐藤知広, 齋藤賢一, 宅間正則, 高橋可昌

    日本機械学会 関西学生会2020年度学生員卒業研究発表講演会  2021.3 

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    Venue:オンライン  

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  • 銅をドープ材とした硫化ビスマスの熱電特性評価

    田中将大, 佐藤知広, 齋藤賢一, 高橋可昌

    日本機械学会 関西学生会2020年度学生員卒業研究発表講演会  2021.3 

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    Venue:オンライン  

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Industrial property rights

  • 銅合金粉末の製造方法

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    Patent/Registration no:6104348  Date registered:2017.3  Date issued:2017.3

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  • 銅合金摺動部材

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    Patent/Registration no:6139208  Date registered:2017.5  Date issued:2017.5

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  • 摺動部材用銅合金及びそれを用いた摺動部材

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    Patent/Registration no:6224992  Date registered:2017.10  Date issued:2017.10

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  • Copper alloy for sliding materials(US Pat.)

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    Patent/Registration no:8906129  Date registered:2014  Date issued:2014

    United States Patent

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  • 摺動部材用銅合金

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    Patent/Registration no:5902615  Date registered:2016.3  Date issued:2016.3

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  • クランクプレス及びそれに使用するギブライナ

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    Patent/Registration no:5977188  Date registered:2016.7  Date issued:2016.7

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  • 摺動部材

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    Patent/Registration no:5980492  Date registered:2016.8  Date issued:2016.8

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Works

  • Surface Modification for Tribo Materials

    SATO,Tomohiro, USAMI,Hatshiko, YAMASHITA,Akinobu

    2022.11

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  • Tribology and surface design

    SATO,Tomohiro, ENOMOTO,Kazuki, USAMI,Hatsuhiko, SASAKI,Shinya

    2021.11

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  • トライボロジーと表面設計

    佐藤知広, 榎本和城, 宇佐美初彦, 佐々木信也

    2019

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Awards

  • Best Oral Presentation Award

    2015.11   Malaysian International Tribology Conference 2015  

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  • 第31回素形材産業技術賞奨励賞

    2015.11   素形材センター  

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    Country:Japan

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  • 日本鋳造工学会技術賞受賞

    2014.5   日本鋳造工学会  

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    Country:Japan

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  • 日本機械学会奨励賞(技術)

    2014.4   日本機械学会  

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    Country:Japan

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  • 日本鋳造工学会関西支部 奨励賞

    2010   日本鋳造工学会関西支部  

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    Country:Japan

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