Probability Damage Tolerance Evaluation Method for Multi-Cracked Structure under Pre-corrosion
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摘要: 为了对恶劣停放环境下的飞机结构进行可靠性分析,利用Wei-Landes线性假设建立预腐蚀条件下的单裂纹扩展随机模型,结合含多裂纹结构的裂纹扩展随机模型,建立了预腐蚀条件下含多裂纹结构的概率损伤容限评定方法.运用于结构的可靠性评定,给出了寿命-可靠度曲线.通过对不同飞行使用强度下的可靠度曲线的比较,得出了飞行使用强度与预腐蚀对裂纹扩展寿命的影响关系.Abstract: For analyzing the aircraft structural reliability under bad parking conditions, probability damage tolerance evaluation method is established. This method is used to analyze the reliability of multi-crack structure considering the influence of pre-corrosion. This method comprehensively surveys the existed single-crack propagation random model under pre-corrosion conditions using Wei-Landes linear theory and the crack propagation random model with multi-crack structure. Finally, the life-reliability curves are given in an illustrative example using the method as indicated above. Comparing the reliability curves of different SUS(Service Usage Severity), the influence of pre-corrosion and SUS to crack propagation life can be obtained.
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