整车焊点失效预测的研究及应用  

Research and Application of Vehicle Welding Spot Failure Prediction

作　　者：季钰荣[1] 孙晓屿 Ji Yurong;Sun Xiaoyu(SAIC Motor Technical Center, Shanghai 201804)

机构地区：[1]上海汽车集团股份有限公司技术中心,上海201804

出　　处：《汽车工程》2019年第2期219-224,共6页Automotive Engineering

摘　　要：通过在CAE模型中对焊点添加失效判据,解决了汽车碰撞有限元模拟中难以准确预测焊点失效的问题。基于焊点力学性能试验获取的焊点失效参数建立焊点失效判据;通过多焊点部件的仿真与试验对比,验证了焊点失效判据的有效性。结果表明,添加焊点失效判据能反映真实的焊点受力和失效情况。在整车碰撞模型中进行焊点失效预测,并通过与实车碰撞结果的对比,表明该方法能准确预测出实车碰撞中的焊点失效情况,对整车碰撞安全设计具有指导意义。By adding failure criterion on welding spots in CAE model, the difficulty in accurately predicting welding spot failure during vehicle crash simulation with finite element analysis is overcome. Welding spot failure criteria are set up based on welding spot failure parameters obtained from the mechanical performance test of welding spots, and the effectiveness of welding spot failure criteria is verified by comparing the results of simulation and test on multi-welding-spot components. The results show that adding failure criterion on welding spots can truly reflect the loading and failure conditions of welding spots. Then the prediction on welding spot failure is conducted on vehicle crash model and is compared with the results of real-vehicle crash test. The outcomes indicate that the method adopted can accurately predict the welding spot failure situation in real vehicle crash, having guiding significance for the crash safety design of vehicle.

关 键 词：焊点失效 碰撞仿真 整车安全 

分 类 号：U467.14[机械工程—车辆工程]