不锈钢厚板焊接凝固裂纹驱动力的三维数值模拟  

3-D NUMERICAL SIMULATION OF DRIVING FORCE OF WELD SOLIDIFICATION CRACKING IN STAINLESS STEEL THICK PLATE

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技术国家重点实验室,哈尔滨150001 [2]哈尔滨焊接研究所,哈尔滨150080

出　　处：《金属学报》2005年第2期214-218,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金资助项目E05020104

摘　　要：利用双椭球形热源模型研究了SUS310不锈钢的三维焊接温度场,并与实验测量进行了比较.在计算温度场的基础上,重点研究了材料在凝固裂纹敏感温度区间内,焊缝金属应变场和位移场的动态场演变过程,得到了10 mm厚板的凝固裂纹驱动力曲线,并利用动态单元再生方法,消除了焊接凝固过程对应变场的影响.模拟计算得到的驱动力曲线与前人实验测量的凝固裂纹阻力曲线进行了比较,初步预测了SUS310不锈钢凝固裂纹敏感性.Double ellipsoidal heat source model and finite element method were used to analyze 3-D welding temperature distributions and the driving force of weld solidification cracking. The comparisons between the simulated and experimental results show the model is good for three-dimensional numerical simulations. The dynamic displacement and strain evolutions were calculated, which induce the formation of solidification cracking in the cracking susceptible temperature range. In the model, the solidification effects were treated by a dynamic element rebirth scheme. Moreover, the calculated driving force of solidification cracking and the measured resistance of solidification cracking were compared and the susceptibility of weld solidification cracking was predicted.

关 键 词：凝固裂纹 应变场 单元再生方法 

分 类 号：TG44[金属学及工艺—焊接]