Nonlinear Considerations in Shock Tower Durability Analysis 2002-01-3483
During usual vehicle life, the shock absorber towers might be submitted to high road impact loads.
After durability tests plastic deformation was observed in the front shock towers, close to the shock absorber bolts attachment neighborhood. Excessive deformation in that area can cause deviation in the suspension system geometry that could drive the shock absorbers to malfunction.
Although the real life load is very intense, it acts during a very short period of time requiring more than a material nonlinear or a large displacements analysis to have the proper strain distribution.
The solution method consists on a local non-linear finite element analysis using incremental loads to simulate the plastic deformation measured in tested vehicles and a finite element fatigue life analysis using a full trimmed body vehicle model subjected to the full test road impact loads.