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전자빔 용접 수소 균열 가능성 평가와 균열 방지를 위한 용접 조건 최적화
송지민(Jimin Song),이상훈(Sang hun Lee),박승환(Seunghwan Park),송명의(Myeongeui Song) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
A hydrogen-induced crack is referred to as a crack that occurs at temperatures blow approximately 100 oC after solidification in welding. The Hydrogen-induced crack initiation is caused by the combined effects of high brittleness of the weld, residual stress (maximum principal stress) and diffusible hydrogen in the weld. The cooling rate affects the content of diffusible hydrogen in weld. It is generally recognized that a high cooling rate causes a higher hydrogen content. In this study, FE analyses and tests in various welding conditions were performed. T8/5 cooling rate and residual stress results are extracted and plotted on the plane coordinate to estimate the possibility of the occurrence of the hydrogen-induced crack.
EXCEL Code 와 시뮬레이션 기법을 이용한 고속 충돌 해석에 관한 연구
홍창우(Changwoo Hong),송명의(Myeongeui Song),민준호(Junho Min) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
A fast moving system’s fragments are produced during an unexpected event and it can be incurred an impact with the case of fast moving system(CFMS). To prevent the fragment of fast moving system from penetrating the CFMS, the collided body is required to design not to be penetrated using analysis of simulation method and test. In this study, the simulation of collision is performed by the explicit FEM software LS-DYNA. The material type used in CFMS is a Johnson and Cook model. The input parameters of flow stress and strain of fracture in Johnson and Cook model are calculated using EXCEL. The results of this simulation by EXCEL Code were verified by the results of Simplified Johnson and Cook model simulation.
옵셋각 설계변수를 통한 등속조인트 케이지 강도 개선에 대한 연구
서정호(Jongho Seo),송명의(Myeongeui Song),김필기(Pilki Kim),민준호(Jun-ho Min) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In order to achieve a robust design of CVJ (constant velocity joint), it is the most important thing to increase the fracture torque of the quasi-static torsional fracture test. The fracture torque is decided by the cage of the BJ(ball joint) composition and most broken position is the column of cage. For this reason, Offset angle method has been developed to improve the strength of the cage in this study. The thickness of the cage can be increased than an existing size by using the offset angle method. The fact means that the cage has an advantage for the strength. The analysis simulation on verification for the parameter of offset angle is composed of the strength part and the dynamic part in this study. As a result for the analysis simulation, the strength of the cage has improved 10% compare to the existing offset method. and, the quasi-static torsional fracture test has been carried with CVJ applied to the offset angle parameter. In this test, we identified that the fracture torque has been increased by 10% from existing products.