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Proceedings Paper

Experimental and numerical study of laser-driven spallation on aluminum with VISAR diagnostic
Author(s): L. Tollier; Eric Bartnicki; Remy Fabbro
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Paper 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.

Paper Details

Date Published: 23 September 1996
PDF: 10 pages
Proc. SPIE 2789, High-Power Lasers: Applications and Emerging Applications, (23 September 1996); doi: 10.1117/12.251186
Show Author Affiliations
L. Tollier, Lab. d'Applications des Lasers de Puissance/ETCA (France)
Eric Bartnicki, Lab. d'Applications des Lasers de Puissance/ETCA (France)
Remy Fabbro, Lab. d'Applications des Lasers de Puissance/ETCA (France)

Published in SPIE Proceedings Vol. 2789:
High-Power Lasers: Applications and Emerging Applications
Georges Sayegh; Michael R. Osborne, Editor(s)

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