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Issue J. Phys. IV France
Volume 07, Number C3, August 1997
EURODYMAT 1997 - 5th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) C3-205 - C3-210
DOI 10.1051/jp4:1997337

EURODYMAT 1997 - 5th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading

J. Phys. IV France 07 (1997) C3-205-C3-210
DOI: 10.1051/jp4:1997337

Measurement of the Effects of High-Pressure Laser Shocks on Metallic Targets

T. De Rességuier1, S. Couturier1, J. David2 and G. Niérat2

1  Laboratoire de Combustion et de Détonique, UPR 9028 du CNRS, ENSMA, Site du Futuroscope, BP. 109, 86960 Futuroscope cedex, France
2  Centre CEA de Limeil-Valenton, EIL-DLP-MOE, 94195 Villeneuve-St-Georges cedex, France


Abstract
Piezoelectric measurements have been performed behind metallic samples submitted to short laser shocks of intensities up to 7 TW/cm2, using recently developed polymeric transducers. Some records exhibit a recompression indicating spall damage, confirmed by post-test microscopic observations. Computations involving a laser-matter interaction model and a wave-propagation code lead to a correct agreement on the gauge records. They indicate peak pressures of 7 to 150 GPa in the targets. A phenomenological spall model of the literature provides an approximated description of the relaxation associated with spallation, and a fair estimate of the damage level and location in the target.


Résumé
Des mesures piézoélectriques ont été réalisées à l'arrière de cibles métalliques soumises à des chocs laser brefs d'intensité pouvant atteindre 7 TW/cm2, au moyen de capteurs polymériques. Certains signaux comportent une recompression traduisant un écaillage des cibles, confirmé par un examen post-test. La simulation des expériences avec un modèle d'interaction laser-matière et un code de propagation est en accord correct avec les enregistrements. Elle indique des pressions maximales de 7 à 150 GPa dans les cibles. Un modèle phénoménologique d'écaillage fournit une description approximative de la relaxation associée à la rupture, et de la distribution de l'endommagement dans la cible.



© EDP Sciences 1997


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