疲劳损伤阀值研究

 提出了一种新的疲劳损伤阀值,它是一个随机变量。疲劳寿命在一定显著水平下服从对数正态分布,由此可以证明疲劳损伤阀值服从正态分布。另外,通过统计检验,验证线性累积损伤也服从正态分布。因此,新定义的疲劳损伤阀值与线性累积损伤之间在分布形态上是一致的。还给出了带有可靠度和置信度的疲劳损伤阀值。

Study on Fatigue Damage Threshold

A new fatigue damage threshold is presented in this paper. It is well known that the logarithmic fatigue life observes the normal distribution with a certain significance level. The fatigue damage threshold observes the normal distribution under the condition of the logarithmic fatigue life observing the normal distribution. In addition, it is proved that the lineal cumulative damage also observes the normal distribution by means of statistical testing. Therefore, the distribution configuration of the fatigue damage threshold is the same as the distribution configuration of lineal cumulative damage. The fatigue damage threshold with a reliability and a confidence is suggested in this paper.