DYMAT 1991 - 3rd International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading

J. Phys. IV France 01 (1991) C3-581-C3-587
DOI: 10.1051/jp4:1991382

ÉTUDE DE L'ÉCAILLAGE DANS DES MATÉRIAUX DUCTILES ET FRAGILES SOUS L'ACTION D'UNE ONDE DE CHOC DE DURÉE TRÈS FAIBLE INDUITE PAR UNE IMPULSION LASER

F. COTTET, M. BOUSTIE et T. de RESSEGUIER

Laboratoire d'Énergétique et de Détonique, E.N.S.M.A, rue Guillaume VII, F-86034 Poitiers Cedex, France

Résumé
L'utilisation des ondes de choc générées par irradiation laser permet d'étendre l'étude de l'endommagement dynamique à des amplitudes de choc élevées (jusqu'à quelques centaines de GPa) et des durées de maintien très courtes (quelques nanosecondes). Ce travail, consacré aux matériaux de type fragile en comparaison avec les matériaux de type ductile, présente une étude analytique et numérique des effets des différents paramètres (durée de l'impulsion, pression induite, épaisseur de la cible, ...) et une étude expérimentale de l'écaillage de cibles de verre irradiées par impulsion laser.

Abstract
Laser induced shock wave technique provides a useful means for studying the dynamic fracture in an unusual range of stress and loading duration : respectively up to few hundreds of GPa and less than 10 ns. This paper presents the results of an experimental and numerical study of laser-shock spallation in brittle materials with the comparison with ductile material behaviour. The present investigation has two objectives : first, to study the effect of various parameters (pulse duration, induced pressure, target thickness, ...) and, second, to show preliminary experimental results on glass targets irradiated by laser pulses.

© EDP Sciences 1991

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