Nonlinear fatigue damage cumulative rule based on strength degradation and its application to fatigue life reliability analysis

被引：0

作者：

Huang H. ^{[1
]}

Zhu S. ^{[1
]}

Wang Z. ^{[1
]}

Hou M. ^{[2
]}

Fan Z. ^{[2
]}

Zhou L. ^{[2
]}

机构：

[1] School of Mechatronics Engineering, University of Electronic Science and Technology of China

[2] China Gas Turbine Establishment

来源：

Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | 2011年 / 19卷 / 02期

关键词：

Life prediction; Nonlinear fatigue damage cumulative rule; Reliability; Residual strength; Strength degradation;

D O I：

10.3969/j.issn.1005-0930.2011.02.017

中图分类号：

学科分类号：

摘要：

Fatigue is a damage accumulation process in which the material property deteriorates continuously under cyclic loading. Through investigation of strength degradation in the material during the fatigue process, a nonlinear fatigue damage cumulative rule, a modified Corten-Dolan's theory, is proposed based on the definition of fatigue damage by introducing the concept of modulus degradation. This model improves the application of Corten-Dolan's theory, which considers not only the effects of load interaction but also the phenomenon of strength degradation in materials induced by the loading history. Moreover, the expressions for estimating fatigue reliability of structural elements under multiple loading levels are provided based on this model. These expressions can be used to predict the fatigue reliability and the life of structural elements under the assumption that the distribution of the residual strength can be approximated by the log-normal distribution. Two examples of two level stress loading tests are given for structural fatigue life estimation. The examples demonstrate that the fatigue life predicted by the proposed method is more accurate than those by traditional methods. The proposed method can be generalized to the cases of multilevel loading.

引用

页码：323 / 334

页数：11

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