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Analysis of laser shock waves and resulting surface deformations in an Al-Cu-Li aluminum alloy

Type
Articles dans des revues avec comité de lecture
Author
PEYRE, Patrice
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
BERTHE, Laurent
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
VIGNAL, Vincent
496957 Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] [LICB]
POPA, Ioana
496957 Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] [LICB]
BAUDIN, T.
33665 Institut de Chimie Moléculaire et des Matériaux d'Orsay [ICMMO]

URI
http://hdl.handle.net/10985/17635
DOI
10.1088/0022-3727/45/33/335304
Date
2012
Journal
Journal of Physics D: Applied Physics

Abstract

Laser shock processing is now a recognized surface treatment for improving fatigue or corrosion behaviour of metallic materials through the generation of a compressive stress field. In turn, the analysis of shock wave propagation is of primary importance to predict numerically morphological and mechanical surface modifications. Considering experimental and numerical analyses of shock wave propagation, and surface deformations induced by single impacts, a 2050 aluminum alloy having different microstructures was investigated under laser-shock loading. In a first step, the evolution of shock wave attenuation and elastic precursor amplitude was correctly reproduced by finite element simulations, and in a second step, surface deformations induced by 1-6 local impacts were also compared satisfactorily with experiments. This allowed us to validate mechanical loading and materials' constitutive law, but did not allow accurate determination of residual stress fields on a single impact.

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