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考虑到飞机结构的多部位损伤(MSD,Multiple Site Damage)结构裂纹萌生位置的不同可能对结构的安全性能存在影响,分析结构失效概率对各应力集中部位裂纹萌生寿命和应力的敏感性,量化其对结构安全性能的影响.裂纹萌生寿命采用对数正态模型,通过定义核函数建立MSD结构失效的敏感性分析模型,采用Monte-Carlo模拟计算概率敏感度.该方法利用Monte-Carlo概率分析的结果,只需增加少许计算量即可得到失效概率对参数的敏感度.将该方法应用于共线多孔板分析,得到了给定寿命下失效概率对各关键位置应力和裂纹萌生寿命对数均值的敏感度,从而确定了对结构安全影响最大的位置.
Considering that the different locations of crack initiation in multiple site damage (MSD) structures may have an impact on the structural safety performance, the sensitivity of structure failure probability to crack initiation life and stress at each stress concentration area is analyzed, On the structure safety performance.The crack initiation life is lognormal model, the sensitivity analysis model of MSD structural failure is established by defining the kernel function, and the probability sensitivity is calculated by Monte-Carlo simulation.This method uses the Monte-Carlo probability analysis As a result, the sensitivity of the failure probability to the parameters can be obtained with only a small amount of calculation.This method is applied to the analysis of collinear porous plates, and the failure probability of a given life span is obtained for logarithmic mean values of stress and crack initiation lifetimes The sensitivity to determine the location of the greatest impact on structural safety.