Stochastic Crack Growth Approach under Corrosive Environment for Durability Analysis
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摘要: 为了对恶劣环境下工作的飞机结构进行耐久性分析,建立了腐蚀环境下的随机耐久性分析方法.假设地面停放预腐蚀和空中飞行腐蚀疲劳相互独立,腐蚀环境下的结构疲劳质量服从威布尔分布,采用对数正态随机变量模型描述裂纹扩展过程,得到了裂纹超越概率的表达式.通过与一般环境下和腐蚀环境下的概率断裂力学方法的对比,证实方法更接近于飞机结构的真实使用情况,可以用于腐蚀环境下工作的飞机结构的耐久性评定.Abstract: In order to analyze the aircraft structural reliability under corrosive environment, stochastic crack growth approach (Cor-SCGA) for durability analysis is established. Assuming the influence of the pre-corrosion in parkand the influence of corrosion in flight are independent, the fatigue quality of structure under corrosive environment has a Weibull distribution. Using a log-normal stochastic variable model to describe crack propagation, an equation for predicting the probability of crack exceedance is established. Compared with the probability fracture mechanics approach under corrosive environment (Cor-PFMA) and probability fracture mechanics approach under normal environment (Nor-PFMA), Cor-SCGA is more efficient. This approach will be better used for durability-based design.
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Key words:
- structural reliability /
- structural life-time /
- corrosion fracture /
- durability
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