某车型侧面碰撞B柱结构优化仿真研究

Optimization Simulation of B-pillar Structure in Side Impact of a Vehicle

一般汽车的侧面结构较为薄弱,相比正面没有较大的吸能空间,所以汽车侧面碰撞带来的人员伤害风险较高,汽车侧面的安全性就显得尤为重要。要提高汽车侧面碰撞安全性,B柱的吸能和变形就显得尤为重要。基于LS_DYNA分析方法,运用HyperWorks软件对某车型进行整车建模,搭配当下的主流热成型材料,对一体式、分体式和变厚度式3种B柱加强板设计进行50 km/h侧面碰撞的仿真和结果分析,变厚度式(variable-thickness rolled blanks,VRB)B柱加强板在变形和侵入量方面表现最高,安全性最高。

Generally,the side structure of a car is relatively weak,and there is no larger energy absorpti,on space than the front side,so the risk of injury caused by the side impact of a car is higher,and the safety of the side of the car is particularly important.In order to improve the safety of vehicle side impact,the energy absorption and deformation of B pillar are very important.Based on Ls_DYNA analysis method,this paper uses Hper Works for vehicle modeling,combined with the current mainstream thermal forming materials,Simulation and analysis of side-impact of 50km/h were carried out for three kinds of B-pillar designs:integrated,split-thickness and VRB(Variable-thickness Rolled Blanks).The results show that VRB(variablethickness rolled blanks)has the highest performance in terms of deformation and intrusion and security.