耐撞性仿真, 残余应力和应变影响, 三维应力应变网格映射方法, 一步逆成形有限元法

A three-dimensional stress and strain mesh mapping method was proposed based on the one-step inverse FEA to import stress and strain distribution into fine crash simulation, which can present the forming effect of residual stress and strain in a crash simulation. By using LS-DYNA software,numerical simulations of side impact between mobile barrier and vehicle was carried out. As an example, the mesh mapping method was applied on the main energy absorption component B pillar, which verified the accuracy and feasibility of this method. Results demonstrate that different contributions of forming factors on crashworthiness of B pillar, and stress distribution play a relatively important role. Therefore, the forming effect of stress should be considered in fine crash simulation.