线性单元对焊接残余应力及变形数值模拟影响的研究  

Study on Effect of Linear Elements on Welding Residual Stress and Deformation Numerical Simulation

作　　者：马锋[1] 梁伟[1] 郭科峰[1] MA Feng LIANG Wei GUO Kefeng(School of Mechanotronics ＆ Vehicle Engineering, Chongqing Jiaotong University, Chongqing 400074, Chin)

机构地区：[1]重庆交通大学机电与车辆工程学院,重庆400074

出　　处：《热加工工艺》2016年第19期206-210,共5页Hot Working Technology

基　　金：重庆市科委基础与前沿研究计划资助项目(cstc2013jcyja70008)

摘　　要：重点研究不同线性单元对焊接残余应力和变形数值模拟的影响,考察各单元对数值模拟过程计算精度以及计算效率的贡献,利用有限元软件ABAQUS进行数值模拟,充分考虑模型的材料非线性和几何非线性,运用热-弹-塑性有限元间接耦合法实现焊接数值模拟全过程。通过数值模拟分析,得到基于不同线性单元类型条件下的应力分布和焊接变形,经对比分析总结出各线性单元对焊接数值模拟的影响。结果表明:不同线性单元对焊接残余应力分析影响不大,但是对于焊接变形的影响较大。与此同时,不同线性单元对数值模拟的计算效率有较大的影响,非协调模式单元耗时冗长,完全积分单元次之,减缩积分单元计算时间最短,该线性单元在保证较高分析精度的同时,能够有效缩减计算时间,提高计算效率。The influence of different linear elements on the numerical simulation of residual stress and welding deformation was studied. The contributions to calculation efficiency and precision of simulation of different linear elements were researched. Based on the finite element software ABAQUS, and considering geometrical nonlinearity and material nonlinearity, a thermo-elastic-plastic finite element indirect coupling method was adopted to simulate the welding process. The residual stress and the welding deformation of each model were derived fi＇om numerical simulation based on different cinear elements. The influence of different linear elements on calculating accuracy and calculating time of welding numerical simulation was drawn after comparing the calculating accuracy and calculating time of welding numerical simulation. The results indicate that various linear elements have little effect on the stress field, but have large influence on the welding distortion. At the same time, diverse linear elements have significant effect on calculation efficiency, the computing time of incompatible modes is longer than that of full-integration, and the computing time of reduced-integration is the shortest. Meanwhile, on the premise of ensuring calculation precision, the reduced-integration can effectively decrease the calculation time, and improve the calculation efficiency.

关 键 词：线性单元 残余应力 焊接变形 数值模拟 

分 类 号：TG404[金属学及工艺—焊接]