轿车设计中的焊点疲劳寿命预测方法  

Method for Fatigue Life Prediction of Automotive Spot-Welds

作　　者：叶远林 

机构地区：[1]奇瑞汽车有限公司乘用车工程研究院,安徽芜湖241009

出　　处：《计算机辅助工程》2006年第B09期189-192,共4页Computer Aided Engineering

摘　　要：介绍一种焊点疲劳寿命预测的工程计算方法.用有限元分析中的CWELD单元模拟焊核,用壳单元模拟连接板,根据CWELD单元传递力和力矩计算焊核附近连接板和焊核周围的“结构应力”;然后通过一组焊点S—N曲线估计焊点的疲劳寿命.通过分析预测焊点疲劳寿命以及相应位置,发现白车身薄弱环节.An engineering calculation method of spot weld fatigue life prediction is introduced. The method applies the CWELD element to simulate the weld nugget and the shell element to simulate the sheet metal and uses the bar element cross sectional forces and moments to calculate the ＂structural stresses＂ in each spot-weld nugget and the adjacent sheets. These stresses are then used to make fatigue life predictions on the spot weld using the S-N curves method. From the analysis the fatigue lives and the locations of spot-welds can be predicted and the weak area of BIW can be found.

关 键 词：疲劳寿命预测(FLP) 结构应力 S-N曲线 白车身 

分 类 号：U469.11[机械工程—车辆工程]