北京航空航天大学学报 ›› 2002, Vol. 28 ›› Issue (1): 113-115.

• 论文 • 上一篇    下一篇

裂纹扩展寿命安全可靠性分析模型研究

罗毅1, 黄培彦1, 刘文珽2   

  1. 1. 华南理工大学 交通学院;
    2. 北京航空航天大学 飞行器设计与应用力学系
  • 收稿日期:2000-07-11 发布日期:2010-11-19
  • 作者简介:罗 毅(1968-),男,江西南昌人,博士生,510640,广州.
  • 基金资助:

    广东省自然科学基金资助项目(960255)

Research on Life Reliability of Fatigue Crack Propagation

LUO Yi1, HUANG Pei-yan1, LIU Wen-ting2   

  1. 1. South China University of Technology, College of Traffic and Communication;
    2. Beijing University of Aeronautics and Astronautics, Dept. of Flight Vehicle Design and Applied Mechanics
  • Received:2000-07-11 Published:2010-11-19

摘要: 通过分析影响裂纹扩展寿命的多个随机因素,就目前较为常用的裂纹扩展寿命安全可靠性分析模型进行比较.在此基础上,本文提出了一种新的模型——裂纹扩展寿命~断裂韧度可靠性分析模型,该模型基于目前比较公认的裂纹扩展寿命分布和断裂韧度分布特性,为工程界进行含裂纹结构的概率损伤容限评估提供一定的理论依据.

Abstract: By analyzing stochastic of effects on the fatigue crack propagation life, a few models on life reliability of fatigue crack propagation in common use were compared. On the base, a kind of reliability model, so called the reliability model of fatigue crack propagation life corresponding to fracture toughness, was proposed in this paper. The model is based on the distributions of fatigue crack propagation life & fracture toughness, which were generally accepted as Weibull distribution or logarithmic normal distribution. The paradox about the distribution of crack size was avoided, especially for three dimensional cracks, two-directional crack sizes were included in the maximum stress strength factor in front of the crack. It was suitable to the probabilistic damage tolerance evaluation of structures including all kinds of cracks or faults.

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