疲劳裂纹扩展的概率分析模型

A PROBABILISTIC MODEL FOR FATIGUE CRACK GROWTH

本文提出了一个新的疲劳裂纹扩展的概率分析模型，对裂纹扩展速率表达式中参数Ｃ和ｍ的概率特性进行理论分析，由Ｃ和ｍ的相关关系得到该分析模型的一个数学论证，并采用△Ｋ控制的裂纹扩展实验对模型的正确性和可行性进行了验证，给出了各参数的解析方法和该模型的应用例。

This paper deals with a new probabilistic model to present the behaviorwith respect to the fatigue crack growth. The crack growth law is proposed, and alsothe probabilistic properties of the parameters, C and m, are discussed. The mathematicmethod with respeCt to the relationship between C and m, and the experimental methodusing the AK controlled fatigue crack growth test are proposed to expound and provethe validity and feasibility of the model.The method for the determination of theparameters of the model is presented, and applied to estimate the fatigue crack growthlives.