疲劳裂纹扩展规律Paris公式的一般修正及应用

General Modification and Application of the Paris Law for Fatigue Crack Propagation

介绍了疲劳裂纹扩展规律Paris公式及其与传统应力疲劳S-N曲线的关系,分析了计算疲劳裂纹扩展寿命的一般过程。阐述了当前Paris公式在工程中的一般修正,具体描述了不同的修正形式及其主要特征,简要介绍了Paris公式在弹塑性断裂力学和连续损伤力学中的修正及应用。各种应用实践表明,对于不同要求的工程问题要采用相应的修正形式。

The paper has reviewed the Paris law for fatigue crack pwpagation, the relationship between the Paris equation and the traditional stress fatigue S - N curve of material, and the common process of calculating the lifetime for fatigue crack propagation. The general modification and application of the Paris law in engineering is discussed, and the different forms and characteristics of modification are analyzed and explicated. The modification and application in the elastoplastic fracture mechanics and the continuum damage mechanics is briefly introduced. It has been shown that, the appropriate modification forms should be adopted for different problems in engineering.