铝热焊的温度场及残余应力场有限元分析  

Finite element analysis of welding temperature and residual stress field of thermit welding

作　　者：何波[1] 孙长青[2] 陈威[2] 

机构地区：[1]沈阳航空工业学院机电工程学院,辽宁沈阳110136 [2]装甲兵工程学院机械工程系,北京100072

出　　处：《焊接技术》2010年第1期20-23,共4页Welding Technology

基　　金：国家自然科学基金项目(50275149)

摘　　要：应用ANSYS软件对焊接模型进行了有限元建模，并利用单元生死技术和热一结构耦合功能仿真了焊接过程，模拟出铝热焊动态温度场和动态残余应力场。结果表明：加压的最佳时间在55～255s之间，焊接结构中最大残余应力多出现在熔合区附近，熔合区横向多为拉应力，最大值约212MPa。The welding model of finite element was established and the welding process was simulated by means of the unit’s living and dying technique and the coupling function between heat and structure by the ANSYS software, during which the dynamic temperature and the dynamic residual stress fields were achieved, and the simulation results were almost identical with the measuring results. The simulation results showed that the optimal pressing time was from 55 s to 255 s after welding, the residual stress was probably the most on the locations of fusion zone, transverse tensile stress occurred mostly in fusion zone, and maximal tensile stress had approached 212 MPa, and some data which could provide reference for the welding technical design had been acquired .

关 键 词：铝热焊 温度场 残余应力 有限元法 

分 类 号：TG457.1[金属学及工艺—焊接] O242.21[理学—计算数学]