疲劳强度概率分布的统计推断

 本文就疲劳强度概率分布问题从统计角度出发,利用统计推断方法处理。通过三组较大子样的疲劳试验数据的统计分析,得出与在假定一定的疲劳寿命概率分布下由数学分析方法推导出的理论概率分布完全不同的结论。该法中疲劳强度概率分布与疲劳寿命分布没有直接关系。

THE STATISTICAL INFERENCE OF THE FATIGUE STRENGTH PROBABILISTIC DISTRIBUTION

This paper deals with the fatigue testing results by the method of statistical inference. Firstly, the fatigub life distributions and the P-S-N curve equations are estimated. Secondly, the fatigue strength data corresponding to given fatigue lives are deduced by using the P-S-N curve equations. Finally, the fatigue strength probability distribution is inferred. This paper gives three examples, their results of statistical inference are not the same as the theoretical distributions deduced from the distributions of fatigue life being assumed. While the distribution of fatigue strength probability distributions cannot reject Weibull distribution as well. On the other hand, when fatigue life distributions are neither the two-parameter log-normal nor the three-parameter WeibulJ distribution, the fatigue strength data can still be described as three-parameter Weibull.