Crash analyses was carried out to characterize crash behavior and injury of a wheelchair user in a train during collision based on SAFETRAIN PROJECT and AV/ST 9001, train safety regulations. There is no restraint system such as seat belt or air-bag in train, a wheelchair user is normally injured by bumping against wall. Crash behavior and injury of a wheelchair user was evaluated with respect to the distance (Dw) of the wheelchair from the wall and the wall foam thickness (tF). Additional crash analysis for a wheelchair user with seat belt was also performed in order to check the significance of the seat belt effect during crash.
FE analyses have been performed to characterize triaxiality of Eco-Al7021-T6, one of representative environmentally-friendly materials with lightweight effect, in this study. Also, a novel shape specimen with double notched and a central hole, i.e., DNC specimen, was suggested to obtain two different values of triaxiality from one trial simultaneously. Tensile tests for the standard type specimen were conducted and true stress-true strain relationship, as well as force-displacement curve were obtained. It was revealed that two different values of triaxiality were successfully achieved from the novel DNC specimen, and the number of tests for triaxiality can be reduced with the use of the DNC specimen.
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Comparative Study on J-Integrals of SM45C, Short Fiber GFRP and Woven Type CFRP Shown at Crack through Analytical Method Jae Woong Park, Sung Ki Lyu, Jae Ung Cho Journal of the Korean Society for Precision Engineering.2019; 36(6): 567. CrossRef
In this paper, we focus on the numerical modeling of the reliability of the self-piercing rivet process. Tensile tests were conducted on SPR joining Al (ECO Al7021-T7) specimens. In addition, a 2D axisymmetric FE model was generated to characterise the SPR joining process on the extruded Al sheets. The simulations were carried out using the LS-DYNA, one of the representative explicit finite element codes. A tensile simulation of the riveted two Al plates was performed to investigate the tensile behaviour of self-piercing rivet parts. An FE analysis results showed comparatively good agreement with experiments.
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Strength Prediction by Simulating the Cross-Tension Test for Triple Riveted Joints of Aluminum Dissimilar Materials Using 9 mm Self-Piercing Rivet Seung-Min Yuna, Hyeong-seok Jang, Dae-guk Lee, Hee-soo Park, Sang-Yeol Kim Journal of the Korean Society of Manufacturing Technology Engineers.2024; 33(1): 11. CrossRef
Validation of the Joinability of 9 mm SPR for Automotive Dissimilar Material Three-Joint Configurations Using Joining Parameters Hyeongseok Jang, Seungmin Yun, Heesoo Park, Daeguk Lee, Sangyeol Kim Transaction of the Korean Society of Automotive Engineers.2024; 32(4): 387. CrossRef
Comparative Study on J-Integrals of SM45C, Short Fiber GFRP and Woven Type CFRP Shown at Crack through Analytical Method Jae Woong Park, Sung Ki Lyu, Jae Ung Cho Journal of the Korean Society for Precision Engineering.2019; 36(6): 567. CrossRef
This study uses finite element analysis to evaluate the forming load of tool entrance angle of the cold forward extrusion molding process of helical gear; this can replace the spur gear applied to the Electronic Parking Brake (EPB) system. A cold forging process is often used in the automobile industry as well as in various industrial machines due to its high efficiency. Finite element analysis is frequently used when interpreting results of the forging process. Formality was evaluated by calculating tooth profile filling rate of helical gear. Change in required forming load was investigated when the entrance angle of forward extrusion tool die was changed from 30° to 60°, also by finite element analysis. We suggest suitable tool entrance angles.
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