薄壁低碳钢管焊接变形的数值模拟  

Numerical modeling of welding distortion in thin-walled mild steel pipe

作　　者：邓德安[1] 童彦刚[1] 周中玉[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400045

出　　处：《焊接学报》2011年第2期81-84,117,共4页Transactions of The China Welding Institution

基　　金：重庆市自然科学基金资助项目(CSTC;2010BB4060)

摘　　要：基于泛用软件ABAQUS,开发了适用于模拟熔化焊产生的温度场、应力场和应变场的热弹塑性非线性有限元计算方法.通过建立三维有限元模型和采用双椭球高斯体积移动热源,对低碳钢薄壁钢管的焊接温度场和焊接变形进行了数值模拟.同时还采用焊接机器人实际进行了低碳钢薄壁钢管的焊接,并实测了钢管的焊接变形.结果表明,数值模拟得到的变形和试验测量值十分吻合,验证了所开发数值计算方法的有效性.A thermal-mechanical nonlinear finite element method based on ABAQUS was developed to simulate the temperature,residual stress and strain fields in thin-walled structures welded by arc fusion welding processes.The welding temperature field and the welding distortion in a thin-walled mild steel pipe were predicted by using the developed finite element method.Meanwhile,experiments were carried out to measure the actual welding distortion in the thin-walled pipe welded by an arc-welding robot.The coincidence between the simulation and the experimental results confirmed the validity of the numerical simulation method.The numerical simulation method has established a foundation for prediction of welding distortion in thin-walled structure used in practical engineering.

关 键 词：有限元 数值模拟 焊接温度场 焊接变形 

分 类 号：TG115.25[金属学及工艺—物理冶金]