焊接凝固裂纹的数值模拟与预测  

SIMULATING AND PREDICTING WELDING SOLIDIFICATION CRACKS

作　　者：魏艳红[1] 董志波[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实验室,哈尔滨150001 [2]哈尔滨焊接研究所,哈尔滨150080

出　　处：《机械工程学报》2004年第7期93-98,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(50175040)。

摘　　要：研制了一个焊接凝固裂纹数值模拟软件系统。该软件系统可以模拟和预测二维焊接构件是否产生焊接凝固裂纹。首先,系统的前处理部分可以帮助用户对工件进行网格剖分,计算电弧热输入,计算焊缝金属的单元“死”、“活”时间,输入材料性能参数并生成输入卡片。其次,依据生成的输入卡片,该软件系统可以连接Adina&t有限元软件,并对焊接凝固裂纹的温度场和应力、应变场进行模拟计算。然后,系统的后处理部分可以对计算的数据进行处理,并把处理后的结果以平面曲线、云纹图和三维立体图的形式提供给用户。最后,系统还可以把横向可调拘束试验得到的材料的凝固塑性曲线处理、回归成材料的凝固裂纹阻力曲线并将其与计算得到的材料的凝固裂纹驱动力曲线放在同一图形中进行对比,通过对比可预测焊接过程中是否产生凝固裂纹。该软件系统主要采用Visual Basic语言研制,并利用Matlab和Matrix VB软件中的图形函数和矩阵运算函数实现图形的显示。A computer system is developed which can predict the weld solidification cracks for weldment in two dimensions. Firstly, the pre-data-treatment subsystem helped users to discretize the workpiece, calculate heat generation and the time to add or remove the nodes of the welding molten pool, input the physical properties of materials and generate a calculated card for final FEM calculation. Secondly, the system transferred the calculated cards to software package of Adina&t to complete the calculation of thermal, strain and stress distributions. Next, the post-data treatment section could deal with the calculated data and display the results in featured curves, contours and 3D figures. Lastly, the system regressed the experimental data of trans-varestraint test to obtain the resistance curve of weld solidification cracks and had it compared with the driving force in the same figures and thus predicted the possibility of weld solidification cracks. The system is completed with computer languages Visual Basic 6.0 by combining with the matrix calculating and graphic functions of Matlab 5.3 and Matrix VB to realize the display the graphs.

关 键 词：焊接凝固裂纹数值模拟应力、应变场 

分 类 号：TG44[金属学及工艺—焊接]