Presentations -

Derivation of High-Temperature Fatigue Damage Rule for Aluminum Alloy Based on Plastic and Creep Strains Analysis Using Data Assimilation Technique

Towa HAYASHIBE,　Katsuhiko SASAKI,　Ken-ichi OHGUCHI, Kohei FUKUCHI, Yorimasa TSUBOTA, Takuro MITA, Wataru NAGAI, Kouji OHSATO, Nobuaki SHINYA

the 14th Asia-Pacific Conference on Fracture and Strength (APCFS 2024)  (Matsue)  2024.11  -  2024.11  JSME–MMD, KSME–MFD, CMES–IMME, AFG

Fiber Orientation Mechanism of Aluminum-Based Composite Containing Short Carbon Fibers Having Anisotropic Thermal Conductivity Fabricated by Repeated Rolling and Annealing

Kohei FUKUCHI, Ken-ichi OHGUCHI, Kengo Kurosawa, Katsuhiko SASAKI

the 14th Asia-Pacific Conference on Fracture and Strength (APCFS 2024)  2024.11  -  2024.11  JSME–MMD, KSME–MFD, CMES–IMME, AFG

Identification of Plastic-creep Fatigue Damage Rule for Aluminum Alloys Using Particle Swarm Optimization Method

Towa HAYASHIBE, Ken-ichi OHGUCHI, Kohei FUKUCHI, Katsuhiko SASAKI, Yorimasa TSUBOTA, Takuro MITA, Wataru NAGAI, Kouji OHSATO, Nobuaki SHINYA

13th International Fatigue Congress (FATIGUE2022+1)   (Hiroshima)  2023.11  -  2023.11  the Society of Materials Science, Japan, Committee on Fatigue of Materials

Characterization of low-cycle fatigue fracture surfaces of aluminum alloys at high temperature using fractal dimension analysis

Kohei FUKUCHI, Ken-ichi OHGUCHI, Towa HAYASHIBE, Katsuhiko SASAKI, Yorimasa TSUBOTA, Takuro MITA, Wataru NAGAI, Kouji OHSATO, Nobuaki SHINYA

13th International Fatigue Congress (FATIGUE2022+1)  (Hiroshima)  2023.11  -  2023.11  the Society of Materials Science, Japan, Committee on Fatigue of Materials

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.

Thermal and Tensile Properties of Polyethylene Based Heat Storage Composite Containing Phase Change Material and Copper Sheet

Kohei FUKUCHI, Ken-ichi OHGUCHI, Kengo KUROSAWA, Katsuhiko SASAKI

Asia-Pacific Conference on Fracture and Strength 2020   2020.11  -  2020.11  Korean Society of Mechanical Engineers

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

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