一种新型固有应变法的焊接变形仿真

以T形焊接接头为算例,结合热弹塑性有限元法和映射应变分量法研究角焊缝角变形的产生机制,认为固有剪切应变才是产生角变形的主要根源,而不是传统思维认为的横向固有正应变.随后,以此观点为基础,对比分析了两种不同的加载方位对横向约束度、横向固有应变及残余角变形的影响.沿焊缝表面斜向加载更接近于实际测量值和热弹塑性模拟值,表明了此种加载方位的合理性,为更合理的利用固有应变法预测焊接残余变形提供了有益的参考.

NUMERICAL SIMULATION OF THE WELDING DEFORMATION BASED ON A NEW INHERENT STRAIN METHOD

Take a welded T-joint as example,the formation mechanism of angle distortion of fillet weld was studied by combining thermal elastic plastic analysis with mapping strain component method.The results show that the main source of angle distortion of fillet weld is the inherent shear strain instead of the transverse inherent normal strain.Then,based on the view,two different loading directions that influence transverse restraint degree,transverse inherent strain and residual angle distortion were analyzed.The result made by the diagonal load along the weld surface is closer to the measured values and the thermal-elastic-plastic simulated values,which indicate the rationality of the diagonal loading along weld surface.This paper provides beneficial reference for more rational utilization inherent strain predicting weld residual deformation.