Fractographic analysis of the overload effect on fatigue crack growth in 2024-T3 and 7075-T6 Al alloys

A. Albedah; B. Bachir Bouiadjra; S.M.A.K. Mohammed; F. Benyahia

doi:10.1007/s12613-019-1896-4

Volume 27 Issue 1

Jan. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(1): 83-90

A. Albedah, B. Bachir Bouiadjra, S.M.A.K. Mohammed, and F. Benyahia, Fractographic analysis of the overload effect on fatigue crack growth in 2024-T3 and 7075-T6 Al alloys, Int. J. Miner. Metall. Mater., 27(2020), No. 1, pp. 83-90. https://doi.org/10.1007/s12613-019-1896-4

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A. Albedah, B. Bachir Bouiadjra, S.M.A.K. Mohammed, and F. Benyahia, Fractographic analysis of the overload effect on fatigue crack growth in 2024-T3 and 7075-T6 Al alloys, Int. J. Miner. Metall. Mater., 27(2020), No. 1, pp. 83-90. https://doi.org/10.1007/s12613-019-1896-4

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Research Article

Fractographic analysis of the overload effect on fatigue crack growth in 2024-T3 and 7075-T6 Al alloys

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Corresponding author:
A. Albedah E-mail: albedah@ksu.edu.sa
Received: 12 July 2019; Revised: 21 September 2019; Accepted: 22 September 2019; Available online: 16 December 2019

Abstract

Abstract

The effect of single overload on the fatigue crack growth in 2024-T3 and 7075-T6 Al alloys was analyzed. Fatigue tests under constant-amplitude loading with overload peak were carried out on V-notched specimens. Fractographic analysis was used as a principal approach to explain the crack growth retardation due to the overload. Scanning electron microscopy (SEM) analyses were conducted on the fractured surface of failed specimens to study the retardation effect. The obtained results show that the overload application generates a plastic zone in both aluminum alloys. The generated plastic zone is three times larger in the case of 2024-T3 compared to 7075-T6, and thus, a significant crack retardation was induced for 2024-T3. The retardation effect due to the overload for 2024-T3 and 7075-T6 lasted for about 10 mm and 1 mm, respectively, from the point of overload application.
- fatigue crack growth;
- overload;
- retardation;
- fractography;
- crack tip plasticity

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References

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