汽车侧面碰撞试验B柱耐撞性能优化及轻量化设计

Optimization of crashworthiness and lightweight design of B-pillar in vehicle side impact test

为提高汽车碰撞后侧面的安全性,对汽车B柱进行耐撞性能优化及轻量化设计。利用Hypermesh软件划分车辆网格,建立汽车有限元模型。采用LS-DYNA软件分析优化结果,通过B柱加强版进行总成集合化处理,从而实现B柱加强板总成属性转移。采用CAE软件进行仿真实验,确定2 k因子对性能造成影响的关键与非关键因素,通过B柱热成型优化设计提高车辆轻量化效果。实验结果表明:应用该方法优化后,车辆B柱轻量化比基础模型升高了15.4%,车辆整体质量减轻了19%以上。通过对汽车侧面碰撞试验B柱进行耐撞性能实验,可知汽车B柱几乎没有发生变形,车厢内假人胸腔未出现损伤。

In order to improve the side safety in vehicle impact,the crashworthiness optimization and lightweight design of B-pillar in vehicle side impact test are carried out.The vehicle mesh is divided by HyperMesh software,and the vehicle finite element model is established.LS-DYNA software is used to analyze the optimization results,and B-pillar reinforcement plate is used to conduct assembly aggregation processing,so as to realize attribute transfer of B-pillar stiffener assembly.CAE software is used for simulation experiments to determine the key and non-key factors affecting the performance of 2 k factor,and the vehicle lightweight effect is improved through the optimized design of b-column thermal forming.The experimental results show that the B-pillar lightweight of the vehicle is 15.4%higher than that of the basic model,and the whole body weight of the vehicle is reduced by more than 19%.If the B-pillar of vehicle side impact test is tested for crashworthiness,it can be seen that there is almost no deformation of the B-pillar and no damage of the dummy's chest position in the car.