裂纹垂直于双相介质界面时的应力强度因子

Fracture behavior for crack vertical to the interface of bimaterial

本文利用 J积分与应力强度因子的关系 ,采用有限元数值方法研究了当裂纹与双相介质的界面垂直时 ,其裂纹的近界面端和远界面端的应力强度因子随双相介质参数和裂纹端部到界面的距离的变化规律。同时还分析了当边裂纹逐渐扩展时 ,应力强度因子的变化特征。

For a crack being in linear elastic medium, the Strain Energy Release Rate (SERR) of cracktip is equal to the value of J\|integral along path closing the crack\|tip. The Stress Intensity Factor (SIF) is another character in fracture mechanics. The applicable scope of J\|integral for bimaterials is firstly investigated in this paper. When a crack is in one medium of two bonded media and vertical to the interface, the variations of the values of SIF with the bimaterial parameter and the distance between crack and interface are studied by using of Finite Element Method developed by authors. If a crack on the side of one medium in bimaterials is vertical to the interface, the variation of the values of SIF with the expanding crack are also discussed in the paper.