静止裂纹尖端的损伤场:反平面问题

Damage Field at Stationary Crack Tip:Shear Problem

采用新的损伤本构模型和自相似假定，对静止裂纹尖端应力、应变场进行渐近分析，在反平面问题中，给出尖端场的构造：在上半平面，场是由一个损伤区和一个弹性区构成的场为单参数场，它由远场外载荷的大小来确定在损伤区中存在应变的奇异性对不同材料常数计算应力（应变）分布。

Using the new damage constitutive model and the self-similar hypothesis,the asymptotic analysis of stress and strain field-near crack tip is investigated.For Ⅲ type crack problem,crack-tip damage field is composed of a damage sector and an elastic sector in half-plane .The size of sectors is determined by the parameter.Strain in damage zone possesses the singularity only.For different material constants the corresponding numerical results of stress field are given and the damage behavior is farther announced.