Experimental and numerical study of laser-driven spallation on aluminum with VISAR diagnostic

L. Tollier; Eric Bartnicki; Remy Fabbro

doi:10.1117/12.251186

23 September 1996 Experimental and numerical study of laser-driven spallation on aluminum with VISAR diagnostic

L. Tollier, Eric Bartnicki, Remy Fabbro

Proceedings Volume 2789, High-Power Lasers: Applications and Emerging Applications; (1996) https://doi.org/10.1117/12.251186
Event: Lasers, Optics, and Vision for Productivity in Manufacturing I, 1996, Besancon, France

Abstract

Laser-driven shock experiments in combination with VISAR technique have been performed to study the ablation pressure, the dynamic damage and spallation for aluminum targets with thicknesses in the 25-500 micrometers range. Shock- waves up to 100 kbar have been generated by laser irradiation intensities from 10¹⁰-10¹² W/cm² with a wavelength of 1.06 micrometers and pulses duration of 20-30 ns. The pressure profile has been determined using the laser-matter interaction code FILM, its amplitude has been compared with the one inferred by the VISAR velocity measurements. This temporal profile has been also used as a boundary condition applied at the front face of the target in the hydrodynamic code SHYLAC. Recorded free surface velocities from VISAR measurements exhibiting spallation features have been compared with numerical SHYLAC simulations to asses a continuous kinetic model of ductile spallation implemented in the code. Good agreement has been found between measured and predicted rear surface velocities for irradiation conditions leading to damage from void nucleation to complete spallation. Recovered samples have been examined by means of metallographic methods to compare the simulated damage with the experimental one tin terms of spall thickness and damage zone size.

Citation Download Citation

L. Tollier, Eric Bartnicki, and Remy Fabbro "Experimental and numerical study of laser-driven spallation on aluminum with VISAR diagnostic", Proc. SPIE 2789, High-Power Lasers: Applications and Emerging Applications, (23 September 1996); https://doi.org/10.1117/12.251186

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