基于轴向耐撞效能薄壁管材料轻量化设计

A Study of Steel Material Substitution for Lightweight Thin-Walled Tube Design Subject to Axial Crashworthiness

为使汽车节能减排,材料轻量化是其基本方法之一。车身前纵梁截面形状通常是矩形和六边形薄壁管,文章基于BCE单元研究了基于等轴向耐撞效能的矩形和六边形截面薄壁管材料替代轻量化设计分析方法,给出了用高强度钢替代低碳钢的结构轻量化设计实例,并对其碰撞特性进行了有限元计算模拟,验证了理论分析结果。指出以BCE单元模型为基础的材料替代轻量化设计方法对矩形和六边形截面薄壁管是行之有效的。

To save energy and reduce emission,material lightweight in car is one of the basic methods.Longitudinal rails of car body are closed thin-walled tubes.The cross-section shape is mostly square and sometimes hexagon.For the closed thin-walled square and hexagon tube,steel material substitution method for lightweight thin-walled square and hexagon tube design subject to axial crashworthiness is developed.To validate the method,we set up a lightweight design sample of substituting HSS and AHSS for mild steel,then a crash simulation with FEA is built.Through the research and numerical calculation,the validity of the steel material substitution method for lightweight thin-walled square and hexagon tube design based on BCE element is proved.