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The spall strength limit of matter at ultrahigh strain rates induced by laser shock waves

Published online by Cambridge University Press:  13 November 2002

V.E. FORTOV
Affiliation:
Institute for High Energy Density RAS, 13/19 Izhorskaya Street, Moscow 127412, Russia
D. BATANI
Affiliation:
Dipartimento di Fisica “G. Occhialini” and INFM, Universitá degli Studi di Milano–Bicocca, Piazza della Scienza 3, 20126 Milano, Italy
A.V. KILPIO
Affiliation:
General Physics Institute of the Russian Academy of Sciences (RAS), 38 Vavilov Street, Moscow 119991, Russia
I.K. KRASYUK
Affiliation:
General Physics Institute of the Russian Academy of Sciences (RAS), 38 Vavilov Street, Moscow 119991, Russia
I.V. LOMONOSOV
Affiliation:
Institute of Chemical Physics Problems at Chernogolovka RAS, Chernogolovka 142432, Russia
P.P. PASHININ
Affiliation:
General Physics Institute of the Russian Academy of Sciences (RAS), 38 Vavilov Street, Moscow 119991, Russia
E.V. SHASHKOV
Affiliation:
General Physics Institute of the Russian Academy of Sciences (RAS), 38 Vavilov Street, Moscow 119991, Russia
A.YU. SEMENOV
Affiliation:
General Physics Institute of the Russian Academy of Sciences (RAS), 38 Vavilov Street, Moscow 119991, Russia
V.I. VOVCHENKO
Affiliation:
General Physics Institute of the Russian Academy of Sciences (RAS), 38 Vavilov Street, Moscow 119991, Russia

Abstract

New results concerning the process of dynamic fracture of materials (spallation) by laser-induced shock waves are presented. The Nd-glass laser installations SIRIUS and KAMERTON were used for generation of shock waves with pressure up to 1 Mbar in plane Al alloy targets. The wavelengths of laser radiation were 1.06 and 0.53 μm, the target thickness was changed from 180 to 460 μm, and the laser radiation was focused in a spot with a 1-mm diameter on the surface of AMg6M aluminum alloy targets. Experimental results were compared to predictions of a numerical code which employed a real semiempirical wide-range equation of state. Strain rates in experiments were changed from 106 to 5 × 107 s−1. Two regimes of spallation were evidenced: the already known dynamic regime and a new quasi-stationary regime. An ultimate dynamic strength of 80 kbar was measured. Finally, experiments on targets with artificial spall layers were performed showing material hardening due to shock-wave compression.

Type
Research Article
Copyright
© 2002 Cambridge University Press

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