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Identification of constitutive equations at very high strain rates using shock wave produced by laser

Article dans une revue avec comité de lecture
Author
SEDDIK, Raoudha
RONDEPIERRE, Alexandre
PRABHAKARAN, Subramaniyan
MORIN, Léo
ccFAVIER, Véronique
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
ccPALIN-LUC, Thierry
1002421 Institut de Mécanique et d'Ingénierie [I2M]
BERTHE, Laurent

URI
http://hdl.handle.net/10985/21225
DOI
10.1016/j.euromechsol.2021.104432
Date
2021
Journal
European Journal of Mechanics, A/Solids

Abstract

A method coupling experiments and simulations, is developed to characterize the yield stress and strain hardening of several metals loaded at 10⁶ s−ⁱ and < 25 ns, typically involved during Laser Shock Peening. It was applied to four materials: pure aluminum, 2024-T3 and 7175-T7351 aluminum alloys and Ti6Al4V-ELI titanium alloy. Thin foils have been irradiated with high-power laser to induce high-pressure shock wave. Plastic deformation is activated through the thickness up to the rear free-surface of the foils. These experiments have been simulated using three material constitutive equations: Elastic–Perfectly Plastic model considering static yield stress, Johnson–Cook model without strain hardening and Johnson–Cook model with strain hardening. The material parameters of Johnson–Cook law were identified by comparison of the experimental and calculated velocity profiles of the rear-free surface. Results are shown and discussed.

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