不锈钢焊接温度场的三维数值模拟  

Three dimensional simulation of thermal distributions of welding statinless steels

作　　者：董志波[1] 魏艳红[1] 刘仁培[2] 董祖珏[2] 

机构地区：[1]哈尔滨工业大学现代焊接生产国家重点试验室,哈尔滨150001 [2]机械科学研究院哈尔滨焊接研究所,哈尔滨150080

出　　处：《焊接学报》2004年第2期9-14,共6页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(E05020104)

摘　　要：分别详细分析了焊接热源的三种计算模型即高斯热源模型、双椭圆高斯热源模型及双椭球热源模型的数学表达式与物理特点。利用三维有限元网格划分技术,对工件进行网格划分,并采用网格自适应技术对焊缝金属的网格进行自动加密与生成,为缩短焊接过程数值模拟时间创造了条件。在此基础上又对其中两种焊接热源模型所建立的温度场进行了计算,得到了不锈钢SUS310材料温度场的分布规律,研究了各种参数对温度场分布的影响,并与工艺试验结果进行了比较,提出了适合三维有限元分析的最佳焊接热源模型。The mathematical models and physical characteristics of three kinds of models representing welding heat sources are presented. Among them, Gaussian model and double ellipsoidal modelare used to analyze the thermal distributions with FE method. At the same time, this paper analyzed the influences of the heat source models, the latent heat,the welding parameters and the fluid flow of liquid metal on the temperature distributions. The comparisons between the simulated results with the experiments show double ellipsoidal model is good for three-dimensional numeral simulations. Furthermore, the adaptive mesh technique is applied in the three-dimensional numeral simulator! by producing a dense mesh of weld moving simultaneously with the heat source and a much coarser mesh in the other area of the structure which greatly reduces the number of nodes and elements in the simulation.

关 键 词：热源模型 焊接 温度场 数值模拟 不锈钢 

分 类 号：TG457.11[金属学及工艺—焊接] TB115[理学—数学]