BS960在骨架车大梁上的轻量化CAE分析

Lightweight analysis of skeleton vehicle frame using BS960 super high strength steel

为了骨架车大梁的轻量化,首先对某大梁车架原始方案进行了静态强度有限元分析,结果显示最大的Mises应力位置位于纵梁鹅颈位置。然后针对纵梁的最大应力和位移区域,对上翼板、下翼板、腹板厚度的关系进行了灵敏度分析,得到影响最大应力和位移的关键部件。最后纵梁材料升级为BS960并减小厚度与原始方案进行对比,根据不同目的需要,推荐了上翼板—腹板—下翼板的板厚组合,推荐的纵梁板厚组合轻量化率最大为21%。

In order to decrease the weight of skeleton vehicle frame, static strength finite element analysis is conducted for skeleton vehicle frame, the results show that the maximum stress is on the variable section area of the front beam. The relationship between the thickness of top beam, middle beam and bottom beam and the maximum stress ＆ displacement is analyzed by dynamic sensitivity analysis（DSA） ,the key part influencing the maximum stress ＆ displacement is found out. Finally, the new plan which changes the material to BS960 super high strength beam steel and the beam thickness is compared with the original plan. New beam thickness combinations are introduced based different purposes, and the maximum responding lightweight ratio is 21%.