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유한요소해석을 이용한 자동차용 2-piece 단조 휠의 굽힘하중 내구수명 예측
김만섭(Manseob Kim),고길주(Kilju Ko),송현우(Hyunwoo Song),양창근(Changgeun Yang),김관묵(Kwanmuk Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
2-piece forged wheels show the propagation of bending fatigue in welding area against common casting wheels. Accordingly, this paper described the fatigue life prediction of 2-piece forged wheel by simulating the experimental method using finite-element program. 2-piece forged wheel composed of a casting disk(A356.2) and a forged rim(A5052). After bidirectional strain gages sticked to welding area of inner rim and outer rim, wheel was tested using a bending fatigue tester. Results from bending fatigue test showed a linear correlation between bending moment and strain amplitude in welding area of rim. Also, in order to find stress-cycles curves, specimens made of welding filler(A5356) were tested using a rotary bending fatigue tester. Regression lines and confidence intervals from these results are used to predict the fatigue life of the wheel.
자동차용 휠(wheel)의 충격해석 신뢰도 향상을 위한 13도법 충격시험기의 강성 연구
고길주(Kilju Ko),김만섭(Manseob Kim),송현우(Hyunwoo Song),양창근(Changgeun Yang) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.4
It is positively necessary to study on the stiffness of a 13degree-type impact tester in order to improve the fracture prediction of impact testing in wheels using FE(finite-element) analysis. The 13degree-type impact tester consists of an impact striker, a wheel fixer, a steel plate, and four cylindrical rubbers. Important parts of the tester are the steel plate and four cylindrical rubbers which play a role of absorbing impact energy during impact testing. Because of these buffers, the RF(reaction force) variation of the lower part in the 13degree-type impact tester showed the tendency like a damped harmony oscillation during impact testing. In order to investigate the stiffness of a 13degree-type impact tester, this work measured each stiffness of a steel plate and cylindrical rubbers. The stiffness of a cylindrical rubber was measured using a compressive tester. On the other hand, the stiffness of a steel plate was predicted by simulating experimental method using FE analysis.