幂软化损伤材料Ⅲ型动态裂纹尖端的渐近场

The Asymptotic Field near a Mode-Ⅲ Propagating Crack-tip in a Power-low Soften-damage Material

利用幂软化损伤模型，对Ⅲ型裂纹进行了详细的研究，给出了本构方程及渐近方程。位移、应变和应力用对数级数展开，揭示了场的渐近特性。其结果表明，应力和应变分别具有如下的奇异性：

For the antiplane shear problem the constitutive relations are derived and the asymptotic equationsof the dynamic elastic-plastic field are given by means of a power-low softening model. The displace-ments,strains and stresses are expanded in series of In,the asymptotic behaviors of the field are re-vealed .The results show that at the crack-tip.