包含过热区的焊接接头强度组配对CTOD的影响  

Influence of Weld-Joint Strength Mismatching on Crack Tip Opening Displacement Including Heat Affected Zone

作　　者：雷永平[1] 张清 史耀武[1] 夏志东[1] 田志凌[3] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100022 [2]新疆工业设备安装工程公司,乌鲁木齐830013 [3]北京钢铁研究总院,北京100081

出　　处：《核动力工程》2002年第3期40-45,共6页Nuclear Power Engineering

基　　金：国家973项目‘新一代钢铁材料重大基础研究’(G1998061500);留学回国人员基金资助项目;教外司留[1998]679号

摘　　要：利用试验研究和数值分析方法,对模拟焊接接头三点弯曲试样不同强度组配对裂纹尖端张开位移(CTOD)的影响进行了研究。本研究的模拟焊接接头试样是通过电子束焊接法焊制的。数值分析中采用了三金属模型,较以往的二金属模型更接近于实际。结果表明,不同的焊接接头强度组配对CTOD有不同程度的影响;无量纲载荷P/PY和CTOD裂纹扩展驱动力关系曲线与极限载荷的选取有很大关系;二维数值计算与试验结果在无量纲载荷P/PY较小时具有良好的一致性,但随P/PY的增加,二者的偏差增大。Combining experimental and numerical simulation methods, the effects of weld-joint strength matching on the crack tip opening displacement (CTOD) of three point bending specimen are investigated. The specimens are composed of different steels and are welded by electronic welding method. The electronic beam welds are treated as a strength zone, and the weld joint specimens are simulated by tri-metal model, which is more approaches the real weld joints, for the numerical calculations. The results indicated that the different strength matching of the weld joints affect the CTOD with different degree, and the relation of CTOD versus normalized load P/PY is greatly related with the selection of limited load PY (base metal limited load BMYPor weld metal limited loadWMYP). When the applied load is relative small the calculated CTOD results are good agreement with the experimental results. However, with the increasing of P/PY, the difference between them is also increases.

关 键 词：裂纹尖端张开位移(CTOD) 有限元分析 强度组配 极限载荷 

分 类 号：TG115.5[金属学及工艺—物理冶金]