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Affiliation |
Graduate School of Engineering Science Department of Materials Science Materials Science and Engineering Course |
OHGUCHI Ken-ichi
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Graduating School 【 display / non-display 】
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-1992.03
Hokkaido University Graduated
Graduate School 【 display / non-display 】
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-1997.03
Hokkaido University Graduate School, Division of Engineering Doctor's Degree Program Completed
Campus Career 【 display / non-display 】
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2015.04-Now
Akita University Abolished organization Deparment of Materials Science and Engineering Professor
Thesis for a degree 【 display / non-display 】
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Fatigue Strength Evaluation for Pb/Sn Alloy Using Viscoplastic Constitutive Model
1997.03
Single author
Research Achievements 【 display / non-display 】
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A material constants estimation method for efficient elastic–plastic–creep simulation of aluminum alloys by effective utilization of stored test data
Ken-ichi Ohguchi, Katsuhiko Sasaki, Kohei Fukuchi, Yorimasa Tsubota, Takuro Mita, Wataru Nagai, Kouji Ohsato and Nobuaki Shinya
Mechanics of Time-Dependent Materials ( Springer Nature ) 26 ( 4 ) 2022.11 [Refereed]
Research paper (journal) Domestic Co-author
アルミニウム合金製の自動車エンジン部品の耐疲労性は，弾・塑性・クリープ有限要素解析（FEA）を実行して評価する必要がある。そのためには，引張試験に加えて，長時間におよぶクリープ試験を実施してFEA用の材料定数を決定しなければならない。しかし，長時間におよぶ試験の実施は，製品開発において大きな障害となる。そこで，アルミニウム合金製自動車部品の性能評価試験などの結果を解析して，クリープ試験を行わずに弾・塑性・クリープFEA用の材料定数を導出することを試みた。その結果，この方法により導出した材料定数を用いれば，熱負荷と機械負荷を同時に受ける疲労負荷のシミュレーションが可能であることが判明した。
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Evaluation of high-temperature fatigue life of aluminium alloys using plastic-creep separation method
Kohei FUKUCHI, Ken-ichi OHGUCHI, Katsuhiko SASAKI, Yorimasa TSUBOTA, Takuro MITA, Wataru NAGAI, Kouji OHSATO and Nobuaki SHINYA
Transactions of the JSME 2021.02 [Refereed]
Research paper (journal) Domestic Co-author
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Evaluation of material nonlinearity of Cu/Sn IMCs based on FEA of shear test using copper-solder joints
Kengo KUROSAWA, Ken-ichi OHGUCHI, Kohei FUKUCHI and Atsuko TAKITA
Quarterly Journal of the Japan Welding Society ( JAPAN WELDING SOCIETY ) 38 ( 4 ) 429 - 437 2020.12 [Refereed]
Research paper (journal) Domestic Co-author
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Synthesis and Mechanical Properties of AlN–WC Ceramics
akashi SEKINE, Akihiro NINO, Yasushi SUGAWARA, Shigeaki SUGIYAMA, Ken-ichi OHGUCHI and Hitoshi TAIMATSU
Journal of the Japan Society of Powder and Powder Metallurgy ( Japan Society of Powder and Powder Metallurgy ) 67 ( 10 ) 581 - 587 2020.10 [Refereed]
Research paper (journal) Single author
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Fatigue life estimation of SAC solder based on inelastic strain analysis using stepped ramp wave loading
K. OHGUCHI, K. SASAKI, Y. YUZE, K. FUKUCHI
Mechanical Engineering Journal 6 ( 5 ) 1 - 11 2019.08 [Refereed]
Research paper (journal) Domestic Co-author
◆Original paper【 display / non-display 】
Grant-in-Aid for Scientific Research 【 display / non-display 】
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Grant-in-Aid for Scientific Research(C)
Project Year： 2024.04 - 2027.03
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Development of Microsoldering Method Based on High Accuracy FEA Regarding Primary Tin Crystal and Intermetallic Compounds as Structural Members
Grant-in-Aid for Scientific Research(C)
Project Year： 2018.04 - 2021.03
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Grant-in-Aid for Scientific Research(C)
Project Year： 2014.04 - 2017.03
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Grant-in-Aid for Scientific Research(C)
Project Year： 2010.04 - 2013.03
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Grant-in-Aid for Scientific Research(C)
Project Year： 2007.04 - 2009.03
Acceptance of contract business 【 display / non-display 】
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Contract period： 2023.07.05 - 2024.02.29
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Contract period： 2011.12.01 - 2012.07.31
Presentations 【 display / non-display 】
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An Efficient Parameter Estimation Method for Elastic-Plastic-Creep Simulation of Aluminum Alloys
Ken-ichi Ohguchi, Katsuhiko Sasaki, Kohei Fukuchi, Yorimasa Tsubota, Takuro Mita, Wataru Nagai, Kouji Ohsato, Nobuaki Shinya
WCCM-APCOM 2022 (Yokohama, Japan Virtual) 2022.07 - 2022.08 International Association for Computational Mechanics (IACM) and The Japan Society for Computational Engineering and Science (JSCES)
Automotive engine components made of aluminum alloys are often subjected to loading in a high-temperature range that exceeds 1/2 of the melting temperature Tm of aluminum alloys. Therefore, the strength reliability of the aluminum alloy components should be evaluated by conducting elastic-plastic-creep finite element analysis (FEA). However, in fact, elastic-plastic FEAs have been conducted for the evaluation to avoid long-term product development time, because the elastic-plastic-creep FEA requires long-time creep tests under at least three stress levels at several temperatures to determine material constants. This is not a favorable situation to ensure the strength reliability of the aluminum alloy engine components. In this study, we propose an estimation method for the material constants used in a creep model for an aluminum alloy without conducting any creep test. The method utilizes stored heat cycle test data that are closely related to the strength reliability evaluation for aluminum-alloy engine components. The research and development departments of car companies often have stored a lot of test data related to practical use even though they do not have enough time to carry out creep tests. In addition, we introduce the “plasticity-creep separation method” [1], [2] which employs the estimated creep material constants to obtain time-independent stress-elastoplastic strain relations. Using these relations, the material constants for the plastic model considering the kinematic hardening can be estimated systematically. The elastic-plastic-creep simulations of time and temperature dependent cyclic deformations of the aluminum alloy are conducted using the estimated material constants. The simulations successfully predict both the time and temperature dependent deformations.
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微小SACはんだの引張強さに対する初晶Snの形状と分布形態の影響
大口健一，菅絢一郎，福地孝平，黒沢憲吾，瀧田敦子
日本機械学会M&M2019材料力学カンファレンス (福岡市) 2019.11 - 2019.11 日本機械学会 材料力学部門
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Fatigue Life Evaluation for Cu-Solder Joint Showing Biaxial Ratchetting Deformation under Simulated HALT Loading Condition
Ken-ichi OHGUCHI, Katsuhiko SASAKI, Yusuke TOMIZAWA, Daisuke ECHIZENYA and Nobuaki ANDO
Mechanical Engineering Congress, 2018 Japan (Suita, Osaka) 2018.09 - 2018.09 The Japan Society of Mechanical Engineers
Academic Activity 【 display / non-display 】
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2024.04-2026.03
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2024.03-2025.02
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2023.05-2025.05
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2023.04-2025.03
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2022.04-2022.09