裂纹长度、焊缝宽度及强度组配对焊接接头J积分的影响  

EFFECTS OF CRACK LENGTH,WELD WIDTH AND STRENGTH MATCHING ON J- INTEGRAL FOR WELDED JOINTS

作　　者：贺定勇[1] 李晓延[1] 史耀武[1] 沙鹏[1] 

机构地区：[1]北京工业大学材料科学与工程学院,100022

出　　处：《焊接》2002年第6期10-13,共4页Welding & Joining

基　　金：国家自然科学基金资助项目 (5950 1 0 1 1 );北京市科技新星资助项目

摘　　要：采用虚拟裂纹扩展法对焊接接头力学不均匀体的断裂参量J积分进行了数值模拟分析。考察了焊接接头J积分的守恒性以及不同的裂纹长度 (a/W =0 .1～ 0 .5 )、焊缝宽度 (H/c =0 .1～ 0 .5 )和强度组配 (M =0 .6～1.4)在加载过程中对J积分的影响。计算结果表明 :焊接接头裂纹尖端近场的J积分具有路径依赖性 ,而在远离裂尖的J积分表现出路径无关性。强度组配因子M对J积分值有很大的影响 ,焊缝宽度、裂纹长度对J积分值也有影响。The virtual crack extension method has been utilized to simulate the J-integral of non-uniform welded joints. The conservation of J-integral of welded joint has been investigated. The effects of crack length(a/W=0.1～ 0.5) , weld width (H/c=0.1～0.5) and strength matching (M=0.6～1.4) on J-integral are discussed. The results show that the J-integral is path-independent except for contours very close to the crack tip. The factor M of strength matching has a great influence on the J-integral. The J-integral value is variable with the diversity of weld width and crack length.

关 键 词：焊接接头 J积分 裂纹长度 强度组配 焊缝宽度 

分 类 号：TG407[金属学及工艺—焊接]