Fatigue crack growth reliability analysis under random loading
International Journal of Structural Integrity
ISSN: 1757-9864
Article publication date: 4 September 2019
Issue publication date: 18 March 2020
Abstract
Purpose
The purpose of this paper is to investigate the fatigue crack growth (FCG) under random loading using analytical methods.
Design/methodology/approach
For this purpose, two methods of cycle-by-cycle technique and central limit theorem (CLT) were used. The Walker equation was used to consider the stress ratio effect on the FCG rate. In order to validate the results in three random loading group with different loading levels and bandwidths, the results of the analysis, such as the mean lifetime of the specimen and the average crack length were compared with the test results in terms of the number of loading cycles.
Findings
The comparison indicated a good agreement between the results of the analysis and the test. Further, the diagrams of reliability and the probability of failure of the specimen were obtained for each loading group and were compared together.
Originality/value
Applying the cycle-by-cycle and CLT methods for the calculation of fatigue reliability of a CT specimen under random loading by the Walker equation and comparing their results with each other is not observed in other researches. Also in this study, the effect of the loading frequency bandwidth on lifetime was studied.
Keywords
Citation
Salari, M. (2020), "Fatigue crack growth reliability analysis under random loading", International Journal of Structural Integrity, Vol. 11 No. 2, pp. 157-168. https://doi.org/10.1108/IJSI-06-2019-0053
Publisher
:Emerald Publishing Limited
Copyright © 2019, Emerald Publishing Limited