中文摘要：

激光拼焊板在汽车工业有重要的作用，可是它仍然存在着一些缺点（成形性能低，焊缝移动1，阻碍了它的应用。通过成形极限图预测成形性能能够使工程技术人员考虑成形参数对拼焊板成形性能的影响。不同的数值方法已经被用来预测试验的成形极限图。Gurson．Tvergaard．Needleman（GTN）模型被用作失效准则。通过响应面法的应用，首先得到拼焊板的单个薄、厚板的GTN模型参数，然后模拟得到成形极限图，应用有限元软件进行横向焊接拼焊板的成形极限图预测。结果表明，所研究拼焊板的成形极限低于相应板材的成形极限，拼焊板预测成形极限图和实际极限图一致性较好。

英文摘要：

Tailor welded blanks （TWBs） have great function in auto industries, however, there are some drawbacks （low formability and weld line movement）, which hinders its applications. Forecasting the formability through forming limit diagrams （FLDs） can make the engineering and technical personnel consider the effects of forming parameters on forming behavior of TWBs. Different numerical approaches have been applied in predicting the experimental FLD of these blanks. Gurson-Tvergaard-Needleman （GTN） model was applied as failure criterion. The parameters of GTN model were firstly derived for both thin and thick solitary blanks of TWBs by the application of response surface methodology. Then FLD of experimental method was obtained by simulation. And FLD of transverse welded TWBs was predicted using FE sottware. The results indicate that FLD of studied TWBs is lower than FLD of corresponding sheets, the predicted and experimental FLDs of TWBs have good agreement.