Fatigue Life Extension of AA2024 Specimens and Integral Structures by Laser Shock Peening

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The goal of the present study is to understand the effects of laser shock peening (LSP)-induced residual stresses on the fatigue crack propagation (FCP) behaviour of the commonly used aircraft aluminium alloy AA2024 in T3 heat treatment condition. LSP treatment was performed using a pulsed Nd:YAG laser on compact tensile C(T)50-specimens with a thickness of 2.0 mm. LSP-treated specimens reveal a significant retardation of the fatigue crack propagation. The fatigue crack retardation effect can be correlated with the compressive residual stresses introduced by LSP throughout the entire specimen thickness. A possible application of the LSP process on a component like panel with three welded stringers representing a part of a fuselage structure was performed as well. The skin-stringer AA2024-AA7050 Tjoints were realised through stationary shoulder friction stir welding (SSFSW), a variant of the conventional friction stir welding process. In this relatively new process, the shoulder does not rotate and therefore does not contribute to the heat generation. Consequently, a reduced and more homogeneous heat input leads to a less affected microstructure and better mechanical properties. The efficiency of the LSP process has been demonstrated resulting in an increase of 200 – 400% in fatigue lifetime.
Original languageEnglish
Title of host publicationMATEC Web of Conferences : 12th International Fatigue Congress (FATIGUE 2018)
EditorsHenaff G
Number of pages6
Volume165
PublisherEDP Sciences
Publication date25.05.2018
Article number18001
DOIs
Publication statusPublished - 25.05.2018
Event12th International Fatigue Congress (FATIGUE 2018) - Poitiers, Poitiers, France
Duration: 27.05.201801.06.2018
Conference number: 12
http://www.fems.org/event/fatigue-2018-12th-international-fatigue-congress

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Publisher Copyright:
© The Authors, published by EDP Sciences, 2018.

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