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

• Published in: Journal of physics. D, Applied physics Vol. 45; no. 33; pp. 335304 - 1-9
• Main Authors: Peyre, P, Berthe, L, Vignal, V, Popa, I, Baudin, T
• Format: Journal Article
• Language: English
• Published: IOP Publishing 22.08.2012
• Subjects: aluminum; ALUMINUM ALLOYS (50 TO 99 AL); Aluminum base alloys; COMPRESSIVE PROPERTIES; COMPUTER SIMULATION; COPPER ALUMINUM ALLOYS; DEFORMATION; Elastic deformation; ELASTIC STRAIN; Engineering Sciences; Fatigue (materials); FSW; laser; Laser shock processing; LASERS; Materials; modelling; PROPERTIES; Shock wave propagation; SHOCK WAVES; SIMULATION
• ISSN: 0022-3727; 1361-6463
• DOI: 10.1088/0022-3727/45/33/335304

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.