Fatigue life improvement of cracked aluminum 6061-T6 plates repaired by composite patches

Yousefi, A., Jolaiy, S., Hedayati, R., Serjouei, A. ORCID: 0000-0002-7250-4131 and Bodaghi, M. ORCID: 0000-0002-0707-944X, 2021. Fatigue life improvement of cracked aluminum 6061-T6 plates repaired by composite patches. Materials, 14 (6): 1421. ISSN 1996-1944

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Bonded patches are widely used in several industry sectors for repairing damaged plates, cracks in metallic structures, and reinforcement of damaged structures. Composite patches have optimal properties such as high strength-to-weight ratio, easiness in being applied, and high flexibility. Due to recent rapid growth in the aerospace industry, analyses of adhesively bonded patches applicable to repairing cracked structures have become of great significance. In the present study, the fatigue behavior of the aluminum alloy, repaired by a double-sided glass/epoxy composite patch, is studied numerically. More specifically, the effect of applying a double-sided composite patch on the fatigue life improvement of a damaged aluminum 6061-T6 is analyzed. 3D finite element numerical modeling is performed to analyze the fatigue performance of both repaired and unrepaired aluminum plates using the Abaqus package. To determine the fatigue life of the aluminum 6061-T6 plate, first, the hysteresis loop is determined, and afterward, the plastic strain amplitude is calculated. Finally, by using the Coffin-Manson equation, fatigue life is predicted and validated against the available experimental data from the literature. Results reveal that composite patches increase the fatigue life of cracked structures significantly, ranging from 55% to 100% for different applied stresses .

Item Type: Journal article
Publication Title: Materials
Creators: Yousefi, A., Jolaiy, S., Hedayati, R., Serjouei, A. and Bodaghi, M.
Publisher: MDPI AG
Date: 15 March 2021
Volume: 14
Number: 6
ISSN: 1996-1944
Rights: © 2021 by the authors. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
Divisions: Schools > School of Science and Technology
Record created by: Jeremy Silvester
Date Added: 26 Mar 2021 12:31
Last Modified: 31 May 2021 15:05
URI: https://irep.ntu.ac.uk/id/eprint/42606

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