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考虑腐蚀环境的影响,建立了预腐蚀后结构耐久性分析的概率断裂力学方法。预腐蚀疲劳是影响飞机结构经济性和安全性的最重要因素,考虑地面停放预腐蚀的影响,建立预腐蚀条件下的相对小裂纹扩展规律,以裂纹萌生寿命(TTCI)服从双参数威布尔分布和对数正态分布为基础,反推得到预腐蚀条件下的当量初始缺陷尺寸分布(EIFSD),从而得到任意时刻裂纹尺寸分布函数,进行损伤度分析和经济寿命预测,并进行了预腐蚀后的某型飞机机翼副梁的经济寿命评定。
Considering the influence of the corrosive environment, a probabilistic fracture mechanics method of structural durability analysis after pre-corrosion is established. Pre-corrosion fatigue is the most important factor affecting the economy and safety of the aircraft structure. Considering the influence of pre-corrosion on the ground, the relatively small crack growth law under pre-corrosion conditions is established. The TTCI obeys the two-parameter Weibull distribution And the logarithm normal distribution, the equivalent initial defect size distribution (EIFSD) under the pre-corrosive condition is deduced backwards to obtain the crack size distribution function at any time, the damage degree analysis and the economic life expectancy are predicted, and after the pre-corrosion Estimation of the Economic Life of Wing Poles of a Certain Aircraft.