复合加载方式作用下熔合线上含裂纹焊接接头的裂端场与断裂参量  

Crack-tip stress field and fracture parameter of welded joints with cracks located at fusion line under mixed loading

作　　者：张敏[1] 付翀[1] 李继红[1] 周荣灿[2] 李益民[2] 

机构地区：[1]西安理工大学材料科学与工程学院,西安710048 [2]西安热工研究院材料工程技术研究中心,西安710032

出　　处：《焊接学报》2006年第3期91-95,共5页Transactions of The China Welding Institution

基　　金：陕西省教育厅自然科学基金资助项目(01JK134);教育部激光技术国家重点实验室高级访问学者基金资助项目(2000101)

摘　　要：针对复合载荷作用下熔合线含裂纹的焊接接头,应用弹塑性有限元方法分析了其裂端应力场的分布规律。并对不同组配焊接接头的COD断裂参量及其复合角进行了数值计算,讨论了加载角度和接头强度组配对焊接接头断裂行为及断裂参量的影响机制。研究结果表明,对于复合载荷作用下的熔合线含裂纹焊接接头,其裂端应力场同时受到加载角度以及材料非均匀性的影响。当加载角度较小时,复合载荷对接头性能的影响相对于接头组配的影响更为显著。而当加载角度达到并超过30°时,情况与之相反。Concentrated on the mismatched welded joints contain defects located at its fusion line,the stress-strain fields distribution was analyzed by elasto-plastic finite element method with mixed mode loading.The fracture parameter crack opening displacement and its compound angles were also calculated.The simulated results show that the effects of load angles on the welded joints are more significant than that of strength matching parameters when the loading angle is small.But the effects of strength matching on welded joint are more evident than that of the loading when the loading angle exceeds 30 degree.

关 键 词：有限元方法 焊接接头 复合角 加载角 

分 类 号：TG401[金属学及工艺—焊接]