扩展裂纹尖端的弹-粘塑性场

Elastic viscoplastic field at tip of propagating crack

弹性 -粘塑性模型对反平面剪切扩展裂纹尖端的应力应变场进行了分析 .文中给出了适当的位移模式 ,推导了渐近方程 ,并且给出了数值结果 .分析和计算表明对于低粘性情况应变场具有对数奇异性 .

An elastic viscoplastic model is used to analyse stress and strain fields at the tip of a propagating crack under antiplane shear. The proper displacement pattern is given; the asymptotic equations are derived and solved numerically. The analysis and calculation show that for larger viscosity it possesses power law singularity. The result of this paper revealed then important role of viscosity for crack tip field.