We investigate how the fatigue limit of notched specimens calculated with the Theory of Critical Distance (TCD) changes when variations in the value of the critical distance itself are considered. We motivate our study by showing how attempts at introducing a plastic zone correction in the derivation of the formula for the critical distance lead to a new length which can be significantly larger than the original one. The predictions effected with both lengths were not found to be so different, though. And this led us to study circular holes and V-notches, for which solutions for the ratio $K_f∕K_t$ can be derived analytically.

中文翻译：

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临界距离主题的变化

我们研究了在考虑临界距离值本身的变化时，使用临界距离理论 (TCD) 计算的缺口试样的疲劳极限如何变化。我们通过展示在推导临界距离公式时尝试引入塑性区校正如何导致新长度显着大于原始长度来激发我们的研究。然而，没有发现对两种长度影响的预测有如此大的不同。这导致我们研究了圆孔和 V 型缺口，对于这些比率的解决方案${钾}_F∕{钾}_{吨}$ 可以解析导出。