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为了研究裂纹在纯Ⅱ型加载下的疲劳扩展特性,本文对十字型试样进行了改进。有限元分析表明这种试样具有较均匀的剪应力场,通过实验应力测试并得到了验证。用曲线拟合法得到了Ⅱ型应力强度因子的表达式。
In order to study the fatigue propagation characteristics of cracks under pure type II loading, the cross type specimens were improved in this paper. The finite element analysis shows that this kind of specimen has a more uniform shear stress field, which has passed the experimental stress test and verified. The expression of type II stress intensity factor was obtained by curve fitting.