易产生MSD结构的耐久性/损伤容限综合分析方法

为了同时满足飞机结构寿命和安全性的要求,提出一种耐久性/损伤容限综合分析方法,用以同时对多部位损伤（MSD）结构进行耐久性和损伤容限分析。耐久性分析时采用概率断裂力学方法结合串联可靠性模型,给出给定可靠度要求下的经济维修寿命估计；损伤容限分析中通过抽样模拟结果拟合参数得到剩余寿命的概率分布函数,进而通过寿命干涉模型得到不同裂纹扩展寿命下的结构可靠度。结合工程实例并与现有方法进行对比分析,结果表明：该方法是合理的、有效的；实现了寿命分析和可靠度分析的有机结合,可用于对飞机MSD结构的综合设计和分析。

Comprehensive Analysis Method on Structural Durability and Damage Tolerance for Multiple Site Damage-susceptible Structures

A comprehensive probabilistie analysis method on structural durability and damage tolerance is presen- ted for Multiple Site Damage-prone（MSD） structure to analyze the flight structure service life and reliability in the same time. The probabilistic fracture mechanics method and a series reliability model are used to get the e- conomic service life under given reliability requirement. Monte-Carlo simulations are conducted in conjunction with a three parameter lognormal probability distribution for the residual life. The reliability of the structure un- der differenl crack propagation life is obtained through life interference model. This method implements the combination of life and reliability analysis. It is propitious to analysis and optimizing the design of MSl）-suscep- tible structures. Through a comparison of the results with those yielded by other method, it is concluded that the proposed method is reasonable and efficient.