针对儿童座椅拉拽失效的车身结构改进

在乘用车前期设计阶段,为让儿童保护的安全性能得到控制和优化,以某乘用车根据国家安全法规要求进行儿童座椅拉拽台架试验时,ISOFIX固定装置出现焊点从车身上拉脱失效为例,基于焊点热影响区损伤的焊点失效准则和钣金断裂失效准则,运用有限元分析对其进行虚拟评估和结构改进,有限元分析与试验结果吻合良好。改进结构通过了儿童座椅拉拽台架试验,表明了基于儿童座椅拉拽安全性能的车身结构强度分析具有很好的可靠性和适用性。

Vehicle Body Structure Improvement for Child Seat Pull Failure

In order to control and optimize the child protection performance in the early stage of passenger vehicle design,taking a case as an example that the spot welds of ISOFIX fixing device in a passenger vehicle are pulled off from vehicle body,leading to a failure.Based on the spot weld heat affected zone failure criteria and the sheet metal fracture failure criteria,finite element analysis(FEA)is used to conduct virtual evaluation and structure improvement,and the FEA results well agrees with test ones.Finally,it passes the child seat pull bench test,show?ing that the strength analysis of body structure based on child seat pull safety performance has good reliability and applicability.