随机载荷下疲劳长裂纹扩展构件可靠性分析

摘要

Conventional methods have some insufficiencies for reliability analysis of fatigue long crack growth component.Assuming the load-range course was a stochastic process,the crack growth length and corresponding strength were obtained based on Paris formula.Then the dynamic reliability of component was obtained based on loading-strength interference model and implemented based on Monte Carlo simu-lation method.Finally an apply case was given assuming the loading process was Gamma process,which demonstrated the feasibility of the method.%对于随机载荷下疲劳长裂纹扩展构件可靠性分析，传统方法存在一些不足。在假设载荷加载历程服从某随机过程的情况下，利用Paris公式，得到了历次加载的裂纹扩展长度及相应的强度指标；然后利用载荷-强度干涉模型，得到了构件的动态可靠度，并基于蒙特卡罗仿真方法，介绍了其具体的实现过程；最后，在假设载荷加载历程服从Gamma过程情况下，通过应用实例验证了该方法的有效性。