关于非均质焊接接头中的J积分断裂判据

ON J-INTEGRAL AS A FRACTURE CRITERION IN HETEROGENEOUS WELDED JOINT

采用平面应力弹塑性大变形有限元方法、云纹干涉法以及云纹干涉 有限元混合法 ,从J积分守恒性与J主导有效性两方面仔细考察了非均质焊接接头中的J积分断裂判据 .结果表明 ,至少对于该文所研究的情形而言 ,J积分守恒性及J主导有效性均是有条件存在的 .因此 ,在非均质焊接接头中直接应用J积分作为断裂判据是不合适的 .

The path independence and dominance of J integral fracture criterion for heterogeneous welded joints with different matchings in plane stress case were investigated by means of large elastic plastic deformation finite element method, Moire interferometry method and Moire inferometry finite element hybrid method. The results show that there are some conditions for the path independence and dominance of Jintegral. So, it is irrational to directly use the Jintegral as a fracture criterion in heterogeneous welded joints.