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Fatigue behaviour of geometric features subjected to laser shock peening: experiments and modelling

Fatigue behaviour of geometric features subjected to laser shock peening: experiments and modelling
Fatigue behaviour of geometric features subjected to laser shock peening: experiments and modelling
Finite element models, using the eigenstrain approach, are described that predict the residual stress fields associated with laser shock peening (LSP) applied to aerospace grade aluminium alloys. The model was used to explain the results of laboratory fatigue experiments, containing different LSP patch geometries, supplementary stress raising features and different specimen thickness. It is shown that interactions between the LSP process and geometric features are the key to understanding the subsequent fatigue strength. Particularly relevant for engineering application, is the fact that not all instances of LSP application provided an improvement in fatigue performance. Although relatively deep surface compressive residual stresses are generated which can resist fatigue crack initiation in these regions, a balancing tensile stress will always exist and its location must be carefully considered.
eigenstrain, fatigue, laser shock peening, residual stress
0142-1123
171-179
Achintha, M.
8163c322-de6d-4791-bc31-ba054cc0e07d
Nowell, D.
587adb58-8b15-4efc-bc16-4071a35747f6
Fufari, D.
6fc0b25d-84bb-4010-97dc-f0e9fd0195b9
Sackett, E.
133ff0c9-b9a5-4128-853f-53f536038e8c
Bache, M.
92a3d294-e933-4517-94de-4bbbde90b5ea
Achintha, M.
8163c322-de6d-4791-bc31-ba054cc0e07d
Nowell, D.
587adb58-8b15-4efc-bc16-4071a35747f6
Fufari, D.
6fc0b25d-84bb-4010-97dc-f0e9fd0195b9
Sackett, E.
133ff0c9-b9a5-4128-853f-53f536038e8c
Bache, M.
92a3d294-e933-4517-94de-4bbbde90b5ea

Achintha, M., Nowell, D., Fufari, D., Sackett, E. and Bache, M. (2013) Fatigue behaviour of geometric features subjected to laser shock peening: experiments and modelling. [in special issue: 9th Fatigue Damage of Structural Materials Conference] International Journal of Fatigue, 62, 171-179. (doi:10.1016/j.ijfatigue.2013.04.016).

Record type: Article

Abstract

Finite element models, using the eigenstrain approach, are described that predict the residual stress fields associated with laser shock peening (LSP) applied to aerospace grade aluminium alloys. The model was used to explain the results of laboratory fatigue experiments, containing different LSP patch geometries, supplementary stress raising features and different specimen thickness. It is shown that interactions between the LSP process and geometric features are the key to understanding the subsequent fatigue strength. Particularly relevant for engineering application, is the fact that not all instances of LSP application provided an improvement in fatigue performance. Although relatively deep surface compressive residual stresses are generated which can resist fatigue crack initiation in these regions, a balancing tensile stress will always exist and its location must be carefully considered.

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e-pub ahead of print date: 3 May 2013
Published date: May 2013
Keywords: eigenstrain, fatigue, laser shock peening, residual stress
Organisations: Infrastructure Group

Identifiers

Local EPrints ID: 352207
URI: https://eprints.soton.ac.uk/id/eprint/352207
ISSN: 0142-1123
PURE UUID: c7007843-5736-4f41-84d9-1156529cff0a
ORCID for M. Achintha: ORCID iD orcid.org/0000-0002-1732-3514

Catalogue record

Date deposited: 07 May 2013 14:02
Last modified: 19 Jul 2019 00:43

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