一类复合缺陷对SH波散射及动应力强度因子

运用Ｇｒｅｅｎ函数法研究圆形弹性夹杂及其侧边径向裂纹，一种新复合型缺陷对ＳＨ波散射问题，求解侧边裂纹的散射和裂纹尖端场动应力强度因子。首先，给出在表面处含有半圆形弹性夹杂的弹性半空间的水平表面上任意一点，承受时间谐和的出平面线源荷载作用时的位移函数。其次，取该位移函数作Ｇｒｅｅｎ函数，推导出该问题的定解积分方程。最后，分析介质参数对面圆形弹性夹杂的动应力强度因子的影响。

Scattering of SH-wave by Cracks Originating at a Circular Inclusion Edge and Dynamic Stress Intensity Factor

The problem of SH_wave scattering by cracks of finite length originating at the boundary of a cylindrical inclusion was investigated, and the solutions of dynamic stress intensify factor at crack tip by means of Green's Function method were given.A special Green's function,which is an essential solution of displacement field for an elastic half space with a half cylindrical inclusion while bearing out_plane harmonic line source load at horizontal surface,was developed for the present problem.The integral equations were set up through crack_division technique and continuity conditions,and the solution of dynamic stress intensity factor was obtained.Finally,some examples and results of dynamic stress intensity factor were given,and the influence of cylindrical inclusion to its crack tip field was discussed.