Analysis of the single overload effect on fatigue crack growth in AA 2024-T3 plates repaired with composite patch

[Display omitted] •The fatigue crack leads to retardation followed by overload or bonded patch repair with different consequences.•If the patch is bonded before the overload, the two effects nullify partially and the effect the overall fatigue life of the structure.•If the patch is bonded after the...

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Veröffentlicht in:Engineering fracture mechanics 2018-10, Vol.202, p.147-161
Hauptverfasser: Mohammed, Sohail M. A. Khan, Bouiadjra, B. Bachir, Benyahia, F., Albedah, A.
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Sprache:eng
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Zusammenfassung:[Display omitted] •The fatigue crack leads to retardation followed by overload or bonded patch repair with different consequences.•If the patch is bonded before the overload, the two effects nullify partially and the effect the overall fatigue life of the structure.•If the patch is bonded after the overload, the combined effect complement each other resulting in higher fatigue life.•Thus, it is suggested to the designer of the bonded composite repair to couple the repair with an overload in the hope to get a total arrest of the crack growth. In this study, the effect of a single overload on the fatigue life of cracked aluminum 2024-T3 alloy repaired with a bonded composite patch were studied. Special consideration was given to the load history, sequence of the bonded patch repair and the overload application (repair-overload and overload-repair). The two cases were compared to a reference case involving a single overload on unrepaired specimen. Fatigue tests were performed on V-notched repaired and unrepaired specimens naturally pre-cracked under constant amplitude loading. Fractographic analysis on the failed specimens was carried out to analyze the obtained fatigue results. It was found that when the crack is repaired before the overload application, the retardation effect due to the overload is attenuated by the patch. Nonetheless, when the patch precedes the overload, very high fatigue life extension of about 38.9 times is observed due to a cumulative retardation effect of the two events (patching and overload).
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2018.09.008