准静态Ⅲ型扩展裂纹尖端的粘塑性场

Viscoplastic Field Near a Quasi-Statically Growing Crack-Tip of Mode Ⅲ

采用一种新的弹性一粘塑性模型,对弹性一粘塑性介质中准静态Ⅲ型扩展裂纹进行了渐近分析.分析计算结果表明,在裂纹尖端附近应力和应变具有幂函数奇异性,文中给出了不同粘性系数情况下裂尖场的奇异性指数,并给出了应力场的角函数变化规律.

Based on a new elastic-viscoplastic mode, the asymptotic behaviour of the mode Ⅲ crack growing quasi-statically has been studied in this paper.It is shown that stress and strain singularities are r ~δ.The singularity indices of crack-tip field are given with various confficients of viscosity.The angular function curve of stress field is given.