局部应力应变法已成为预测结构零、部件疲劳寿命的有效方法。 在工程上,常常用近似的方法来计算应力应变。其中最常用的一种近似方法就是Neuber法,其优点是计算比较简单,但是,所得的局部应变往往偏大,用此应变预测疲劳寿命则偏于保守。因此,有人提出用疲劳缺口系数来代替Neuber法中的应力集中系数。 The local stress-strain method has become an effective method to predict the fatigue life of components with zero structure. In engineering, the approximate method is often used to calculate the stress and strain. One of the most commonly used methods is the Neuber method, which has the advantage of relatively simple calculation. However, the local strain obtained tends to be too large, and the fatigue life is predicted to be conservative by this strain. Therefore, it has been proposed to use the fatigue gap factor instead of the stress concentration factor in the Neuber method.