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

A method coupling experiments and simulations, is developed to characterize the yield stress strain hardening of several metals loaded at 106 s?1 < 25 ns, typically involved during Laser Shock Peening. It was applied four materials: pure aluminum, 2024-T3 7175-T7351 aluminum alloys Ti6Al4V-ELI titanium alloy. Thin foils have been irradiated with high-power laser induce high-pressure shock wave. Plastic deformation activated through thickness up rear free-surface foils. These simulated using three material constitutive equations: Elastic–Perfectly model considering static stress, Johnson–Cook without hardening. The parameters law were identified by comparison experimental calculated velocity profiles rear-free surface. Results are shown discussed.