薄壁结构点焊组装回弹分析

Analysis on Springback of Thin-walled Structures Assembled by Spot Welding

采用初始应力法预测点焊组装薄壁构件的释放回弹和残余应力.组装件分析模型为无翘曲偏差理想设计模型,施加等值位移获得夹具校正组件初始翘曲产生的初始应力场.基于理想设计模型和初始应力场,使用耦合节点位移法等效模拟组装件的点焊连接,释放回弹分析得到点焊完毕夹具释放后组装件的回弹变形和残余应力.采用Ansys有限元软件,以某汽车后围裙板为例进行分析,预测组合件的回弹量,通过实验测量数据和模拟结果的对比,验证模拟方法的可靠性.

A method of initial stress is applied in the present paper to predict the springback and residual stress of the assembled thin-walled structure by spot welding. The analysis is based on the ideal design model and an initial stress field. The coupling of nodal displacements is used to represent the equivalence of connections by spot-welding. The springback and residual stress after spot-welding and release of the clamping are obtained by analysis of the welding-release process. The finite element software Ansys is used for the analysis of a car rear section, the springback of assembled part is predicted. By comparison between the measured values in experiment and the simulated results, reliability of the simulation method is validated.