北京航空航天大学学报 ›› 2000, Vol. 26 ›› Issue (5): 556-560.

• 论文 • 上一篇    下一篇

腐蚀环境下的随机耐久性分析方法

张建宇, 刘爱民, 费斌军   

  1. 北京航空航天大学 飞行器设计与应用力学系
  • 收稿日期:1999-04-09 出版日期:2000-05-31 发布日期:2010-09-27
  • 作者简介:张建宇(1973-),男,黑龙江肇东人,博士生,100083,北京.
  • 基金资助:

    国家部委基金资助项目

Stochastic Crack Growth Approach under Corrosive Environment for Durability Analysis

ZHANG Jian-yu, LIU Ai-min, FEI Bin-jun   

  1. Beijing University of Aeronautics and Astronautics,Dept. of Flight Vehicle Design and Applied Mechanics
  • Received:1999-04-09 Online:2000-05-31 Published:2010-09-27

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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