随机载荷下疲劳长裂纹扩展构件可靠性分析  

Reliability Analysis for Fatigue Long Crack Growth Component under Random Load

作　　者：杨智[1] 董华玉[1] 黄松华[1] 

机构地区：[1]镇江船艇学院维修教研室,江苏镇江212003

出　　处：《压力容器》2013年第10期67-71,共5页Pressure Vessel Technology

基　　金：某总部科研项目(装通[2009]83号)

摘　　要：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。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.

关 键 词：动态可靠度 裂纹扩展 Gamma过程 载荷 强度 

分 类 号：TH112[机械工程—机械设计及理论] TB114.3[理学—概率论与数理统计]