三维约束下幂硬化双材料界面裂尖场分析

本文用Ｊ２形变理论分析了三轴应力约束下，由具有不同硬化指数和硬化系数的幂硬化材料构成的界面裂纹问题．通过在本构方程中引入三轴应力约束因子Ｔｚ，我们考虑了三维约束效应对裂尖场的影响．计算结果表明，三轴应力约束对裂尖场的分布，尤其是对径向应力σｒ和有效应力σｅ有重要影响．本文还探讨了三轴约束和材料性能对裂尖应力奇异性的影响

ELASTIC PLASTIC ASYMPTOTIC ANALYSIS OF CRACKS ON BIMATERIAL INTERFACE UNDER THREE DIMENSIONAL CONSTRAINT

An investigation on the near tip fields of cracks lying on the interface of two strain hardening materials has been conducted under three dimensional(3D) stress constraint. By using the J 2deformation theory and cons idering the 3D stress constraint factor T z, an exact asymptotic solution was obtained. It is found that there is strong effect of 3D constraint on the continuities and singularities of radial stress and equivalent stress.