力学不均匀性对焊接接头动态J积分影响的实验研究  

Experimental Study on the Effect of Mechanical Heterogeneity on Dynamic J-integral for Welded Joints

作　　者：张秀英[1] 贺定勇[1] 李晓延[1] 严永长[1] 

机构地区：[1]北京工业大学

出　　处：《中国机械工程》2001年第10期1189-1190,共2页China Mechanical Engineering

基　　金：国家自然科学基金资助项目 ( 5 95 0 10 11);北京市科技新星计划资助

摘　　要：用真空电子束焊的方法建立焊接接头的“软夹硬”非均匀体模型 ,用示波冲击的试验方法测出试件的动态断裂韧性 ,用该模型研究了焊接接头的力学不均匀性对其动态 J积分的影响。结果表明 ,裂纹位于硬区材料 ,断裂韧性值更接近硬区材料 ,与软区材料的断裂韧性值差别较大 ;随夹层宽度增加、断裂韧性值减小、夹层宽度到某一值时 ,断裂韧性值趋于稳定。A soft-between-hard welded joint heterogeneity model was built by vacuum electron-beam welding. The dynamic fracture toughness of the established model is measured by instrumented impact test. With this model, the influence on the dynamic J-integral of the welded joint mechanical heterogeneity was studied. The result shows that while the crack locates the hard layer material, the fracture toughness will be closed to the hard layer material. The fracture toughness is quite different from that of the soft layer material. The fracture toughness decreases with the width's increase of the hard layer. While the width of the layer reaches to some value, the fracture toughness tends to be stabilized.

关 键 词：焊接接头 力学不均匀性 动态断裂韧性 动态J积分 

分 类 号：TG407[金属学及工艺—焊接]