Fatigue Life Analysis of Automotive Stabilizer Bar Based on FEA
Due to the lack of scientific basis in fatigue design,the traditional fatigue reliability design of automotive stabilizer bar is rather conservative,which results in longer development period,cumbersome components and low fatigue reliability,etc.A combination method of FEA calculation and fatigue life analysis of stabilizer bar was proposed in this paper.Based on real CAD model,the FEA model was established.During model establishment of stabilizer bar,two problems were countered,bushing contract area constraints definition and stress extraction accuracy.For bushing constraints,two represent methods were used,in which one is zero width RBE2 with linear solver,and the other one is REB3 with nonlinear solver for the bushing contact area constraint.Stiffness was calculated for each method.Simulation was conducted in NX NASTRAN to determine bushing constraint and stress extraction.For bushing constraints,stiffness comparison was also conducted between REB2 and REB3 with real testing stiffness curve data.Simulation results showed that the solid Von Mises stress of RBE3 constrains with bush element was decreased by 4%than that of RBE2 constrains.And the simulation stiffness with RBE3 constraint was basically the same as the test curve.It was indicated that REB3 constraint was more effective than REB2.For stress extraction,the surface stress of skin elements is relatively less than solid stress,and the plate top stress and the plate bottom stress is roughly equal.Thus,the stress of coat elements(skin elements)was used to describe the surface stress of stabilizer bar and can also maintain the accuracy.Then,fatigue analysis was conducted in Designlife based on skin stress and strain under RBE3 constraint.It was shown that the fatigue life of the stabilizer bar can be up to 530000 times.This fatigue life completely meets the minimum fatigue requirements of the new product development.It was illustrated that the combined FEA calculation and fatigue life method can provides a reference for the fatigue design of the stabilizer bar.
Stabilizer bar NX NASTRAN bushing constraint fatigue design
刘学文 陈浩 戚文
上海工程技术大学,上海,中国,201620 上海中国弹簧制造有限公司,上海,中国,201901
国内会议
2016 Siemens PLM Software 仿真与试验技术大会
大连
英文
1-10
2016-07-11（万方平台首次上网日期，不代表论文的发表时间）