不锈钢点焊车体结构稳定性分析及局部焊点布局优化

Stability Analysis and Weld Spots Layout Optimization for Stainless Steel Spot Weld Carbody

为研究不锈钢点焊车体结构的失稳性问题,首先创建某不锈钢点焊地铁车车体结构有限元模型;在EN12663-2010标准提供的压缩载荷作用下,对车体结构进行稳定性分析,指出车体发生屈曲失稳的部位;然后,对车体失稳部位进行局部结构改进并利用子结构技术和变密度法对车体局部焊点进行布局优化;最后,基于焊点优化结果更新车体模型中的焊点布置,并重新进行稳定性分析,结果表明:车体失稳部位的屈曲因子大于1.5.

In order to study structure stability of stainless steel spot weld carbody, a complex finite element model of the carbody is established and analyzed under compression load according to EN12663-2010 stand- ard. Then buckling parts of the carbody are determined and improved, and optimizations of spot weld layout of these parts are performed by variable density method and substructure analysis method. Based on to the opti- mization results and requirements of weld technology, the weld spot arrangement of the carbody is updated, and linear buckling analysis of the carbody is carried out again. The results show that buckling factors of those buckling parts are all greater than 1.5.