汽车碰撞仿真研究中点焊连接关系的有限元模拟  

FINITE ELEMENT MODELING OF SPOT-WELDING IN DYNAMIC SIMULATION OF AUTOMOBILES

作　　者：何文[1] 张维刚[1] 钟志华[1] 

机构地区：[1]湖南大学现代车身技术教育部重点实验室,长沙410082

出　　处：《机械工程学报》2005年第9期73-77,共5页Journal of Mechanical Engineering

基　　金：国家973基础研究(2004CB719402)国家自然科学基金(10372029;59375196)资助项目。

摘　　要：在汽车有限元分析仿真计算中,结构中的点焊模拟一直是一个难以解决的问题。综合现有的模拟方法,对点焊提出了一种新的处理对策,即在焊接节点之间引入一个刚性梁单元,单元可承受拉伸力和剪切力,同时引入节点耦合技术,在计算焊接节点受力的时候将节点位移约束作为惩罚项添加进去。当单元内部受力超过点焊的实际承载能力时,焊点脱开,单元自动分解为两部分,且分解后自动进入接触搜寻处理系统。The simulation of spot-welding structure remains to be a critical problem when building the finite element model of an automobile body. A new technology of simulation of spot-welding is presented. The spot-welding is treated as a rigid beam element, which can treat the normal force and shear force. As a penalty, the node-coupling method is introduced to compute the forces of spot-welding nodes. When spot-welding node force meets the failure criterion, nodes of the weld are separated from each other, and the rigid beam is removed from the calculation.

关 键 词：汽车碰撞仿真 点焊 有限元模拟 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]