【摘要】 本文分析了裂纹扩展之前Ⅰ、Ⅱ混合型应力应变场演变的自相似性,并采用理想弹塑性模型给出了自相似解基本方程及边界条件.对v=1/2情况给出了尖端附近小范围应力应变的渐近解,同时讨论了满塑性区的存在条件.更多还原

【Abstract】 In this paper, the problem of a crack before growing is studied. The basic equations and contiguity conditions of the self-similar fields are given. When the Poisson’s ratio p=1/2, the asymptotic solution of mixed mode crack problem is solved. The solution showsthat when the stress of Mode I is predominant, the elastic zone always exists in general, but in the case of pure Mode I crack, the field of the crack tip may be occupied by plastic zone entirely When the stress of Mode I is predominant, the field of the crack tip can be full plastic. There is not any discontinuous line of a stress, which is different fromn Shih’s result.更多还原