复杂结构耐久性评定的随机分析方法

ON STOCHASTIC ANALYSIS METHOD OF THE DURABILITY EVALUATION OF COMPLEX STRUCTURE

本文提出了一种随机耐久性分析方法。该方法从耐久性分析的基本原理出发，考虑损伤发展的随机特性，提出用正态随机变量裂纹扩展方程描述裂纹扩展规律，对随机基础的ＥＩＦＳ分布和给定任意时刻的裂纹尺寸分布给出相应的确定方法和推导公式，进而建立较为完善的随机耐久性分析程序。文中通过对实际飞机结构的耐久性分析评估，证明了该方法的有效性。同时该方法可推广应用于其它类似的大型结构。

This paper develops a stochastic durability analysis method. In view of the basic concept of durability analysis, taking into accounts the stochastics of damage process,with the normal-random-variable crack growth equation describing crack propagation,the evaluation methods of ElFS distributions and the formulas of crack size distributions at any time were proposed, and then a complete stochastic durability analysis program was set up.Through practical applications, the method was proved to be applicable for aircraft structures or any other structure.