새클부를 고려한 자동차 겹판스프링의 마찰해석

Abstract

유한요소해석 프로그램인 ABAQUS를 이용하여 자동차용 겹판스프링을 모델링하고 판사이의 마찰에 의해 생기는 하중-변위 히스테리시스 곡선을 재현하여 겹판스프링의 특성을 해석하였다. 상용 트럭의 전륜에 장착되는 스프링에 대한 굽힘시험을 하였고 ABAQUS를 이용하여 접촉뿐만 아니라 마찰까지 고려한 비선형해석을 시도하였다. 또한 스트레인 측정실험은 물론, 동적인 하중하에서의 스프링의 거동에 대해 시험하고, 이를 바탕으로 실제 차량부착시 경관스프링의 거동에 대해 해석을 시도하였다. 섀클의 길이와 각도를 변화시키면 스프링상수값에 영향을 미치게 되는 것을 확인할 수 있었다. 실제로 유한요소 해석을 설계에 이용하기 위해서는 음력집중이 일어나는 센터볼트부를 고려해 3차원 모델링이 필요하며 조립단계의 응력이 고려되어야 한다는 것을 알 수 있었다.

Frictional analysis for the automotive leaf spring was performed by using finite element analysis program ABAQUS and the load-displacement hysteresis curve could be successfully simulated which was caused by interleaf friction. Effect of shackle part on the frictional behavior was found to be significant.

Compression test was performed for the leaf spring used for front suspension of commercial truck from which load-displacement and load-strain results were obtained. It was found that the spring rate could be controlled by changing the length and the angle of a shackle and static spring rates were in good agreements with finite element results, However, measured strain values and friction forces were different fron those of finite element results because of improper modelling of center bolt part and insufficient consideration of friction factors.

3-D modelling and implementation of exact friction data e.g. initial stress in a leaf and friction in the shackle eye are recommended in order to yield better results.

Frictional analysis for the automotive leaf spring was performed by using finite element analysis program ABAQUS and the load-displacement hysteresis curve could be successfully simulated which was caused by interleaf friction. Effect of shackle part on the frictional behavior was found to be significant.

Compression test was performed for the leaf spring used for front suspension of commercial truck from which load-displacement and load-strain results were obtained. It was found that the spring rate could be controlled by changing the length and the angle of a shackle and static spring rates were in good agreements with finite element results, However, measured strain values and friction forces were different fron those of finite element results because of improper modelling of center bolt part and insufficient consideration of friction factors.

3-D modelling and implementation of exact friction data e.g. initial stress in a leaf and friction in the shackle eye are recommended in order to yield better results.