Abstract: In the case of sub-brittle fracture, at the crack tip there is a small plastic region of which effect should not be neglected. In this paper, the authors consider that both the crack length and the stress at infinity change are due to plasticity, and compared the results calculated by five different methods.

摘要： 在准脆性断裂情况下,裂纹顶端存在一个不能忽略其影响的小范围塑性区。本文中我们考虑了幂硬化材料工型裂纹由于塑性变形时,裂纹长度和外加应力同时变化的情况。据此,用五种不同的方法进行了计算和相互比较。