Virtual Proving GroundBased Rear Suspension Fatigue Analysis

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 presents a description of 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 the road load is applied to the 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.

Key words:rear suspension; fatigue; virtual proving ground; road load; elasticplastic material; strainlife method