结构系统静强度与疲劳耦合可靠性的当量寿命分析

基于结构系统静强度和疲劳耦合可靠性分析方法，给出了元件静强度失效的当量寿命和当量损伤的概念。结合蒙特卡罗分析方法，讨论了当量损伤服从正态分布、对数正态分布、极值Ⅰ型分布和威布尔分布时当量寿命的概率分布形式。分析结果表明：当量损伤服从正态分布、对数正态分布、极值Ⅰ型分布时，当量寿命服从对数正态分布；当量损伤服从威布尔分布...

Equivalent Life Analysis of Structural System Coupled Reliability for Static Strength and Fatigue

Based on the coupled reliability method of structural system for static strength and fatigue, the equivalent life and equivalent damage of elements for static strength failure were put forward in this paper. The probability distribution of equivalent life was discussed when the equivalent damage obeyed normal distribution, lognormal normal distribution, I extreme value distribution and Weibull distribution. The results showed that the equivalent life would obey lognormal normal distribution when the equivalent damage obeyed normal distribution, lognormal normal distribution and I extreme value distribution, and the equivalent life would not obey lognormat normal distribution when the equivalent damage obeyed Weibull distribution, in general. But, the results of example showed that the error of failure probability was accepted if equivalent damage was regarded as lognormal normal distribution. It could avoid the equivalent normal transform and simplify the calculation, and improve the calculation efficiency.