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https://hdl.handle.net/2440/91433
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Type: | Journal article |
Title: | A fatigue crack growth model for interacting cracks in a plate of arbitrary thickness |
Author: | Chang, D. Kotousov, A. |
Citation: | Fatigue and Fracture of Engineering Materials and Structures, 2014; 37(11):1254-1267 |
Publisher: | Wiley |
Issue Date: | 2014 |
ISSN: | 8756-758X 1460-2695 |
Statement of Responsibility: | D. Chang and A. Kotousov |
Abstract: | Fatigue and fracture assessment of structures weakened by multiple site damage, such as two or more interacting cracks, represents a very challenging problem. A proper analysis of this problem often requires advanced modelling approaches. The objective of this paper is to develop a general theoretical approach and investigate the fatigue behaviour of two interacting cracks. The developed approach is based on the classical strip yield model and plasticity induced crack closure concept. It also utilises the 3D fundamental solution for an edge dislocation. The crack advance scheme adopts the cycle-by-cycle calculations of the effective stress intensity factors and crack increments. The modelling results were validated against experimental data available in the literature. Further, the nonlinear effects of the crack interaction and plate thickness on the crack opening stresses and crack growth rates were studied with the new approach for the problem geometry. It was demonstrated that the both effects could have a significant influence on fatigue life and cannot be disregarded in life and integrity assessments of structural components with multiple site damage. |
Keywords: | crack interaction; edge dislocation; fatigue crack growth; multiple site damage (MSD); plasticity induced closure; strip yield model |
Rights: | © 2014 Wiley Publishing Ltd. |
DOI: | 10.1111/ffe.12208 |
Published version: | http://dx.doi.org/10.1111/ffe.12208 |
Appears in Collections: | Aurora harvest 2 Mechanical Engineering publications |
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