基于虚拟试验场的后悬架疲劳分析

The Rear Suspension Fatigue Analysis on the basis of the Virtual Proving Ground

摘要:

利用虚拟试验场技术建立耐久性强化路面和整车有限元模型，考虑轮胎的结构非线性因素、轮胎和路面的接触非线性以及橡胶连接件的刚度和阻尼特性等传统CAE分析常使用的人为假定，通过显示时间积分获得道路载荷。基于弹塑性材料模型对后悬架施加道路载荷得到其应力应变历程，应用应变寿命法预测疲劳裂纹萌生寿命,并考虑了平均应力对疲劳寿命的影响。

Abstract:

Considering common artificial assumptions in traditional CAE analysis such as the structural nonlinear of tire , contact nonlinear between tire and road surface，stiffness and damping characteristics of rubber connector ，this paper describes the process of calculating road load by using explicit time integration in virtual proving ground where builds an integrated intensify road and full vehicle finite element model . Then apply the road load on rear suspension model which is described by elastic-plastic material to obtain stress-stain time history. Fatigue crack initiation life can be got by strain-life method and effect of mean stress is also considered.