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Unstable Richtmyer–Meshkov growth of solid and liquid metals in vacuum

Published online by Cambridge University Press:  13 June 2012

W. T. Buttler*
Affiliation:
Los Alamos National Laboratory, Physics, Los Alamos, NM 87544, USA
D. M. Oró
Affiliation:
Los Alamos National Laboratory, Physics, Los Alamos, NM 87544, USA
D. L. Preston
Affiliation:
Los Alamos National Laboratory, X-Computational Physics, Los Alamos, NM 87544, USA
K. O. Mikaelian
Affiliation:
Lawrence Livermore National Laboratory, B-Division, Livermore, CA 94550, USA
F. J. Cherne
Affiliation:
Los Alamos National Laboratory, Shock & Detonation Physics, Los Alamos, NM 87544, USA
R. S. Hixson
Affiliation:
Los Alamos National Laboratory, Physics, Los Alamos, NM 87544, USA
F. G. Mariam
Affiliation:
Los Alamos National Laboratory, Physics, Los Alamos, NM 87544, USA
C. Morris
Affiliation:
Los Alamos National Laboratory, Physics, Los Alamos, NM 87544, USA
J. B. Stone
Affiliation:
Los Alamos National Laboratory, Physics, Los Alamos, NM 87544, USA
G. Terrones
Affiliation:
Los Alamos National Laboratory, X-Theoretical Design, Los Alamos, NM 87544, USA
D. Tupa
Affiliation:
Los Alamos National Laboratory, Physics, Los Alamos, NM 87544, USA
*
Email address for correspondence: buttler@lanl.gov

Abstract

We present experimental results supporting physics-based ejecta model development, where our main assumption is that ejecta form as a special limiting case of a Richtmyer–Meshkov (RM) instability at a metal–vacuum interface. From this assumption, we test established theory of unstable spike and bubble growth rates, rates that link to the wavelength and amplitudes of surface perturbations. We evaluate the rate theory through novel application of modern laser Doppler velocimetry (LDV) techniques, where we coincidentally measure bubble and spike velocities from explosively shocked solid and liquid metals with a single LDV probe. We also explore the relationship of ejecta formation from a solid material to the plastic flow stress it experiences at high-strain rates () and high strains (700 %) as the fundamental link to the onset of ejecta formation. Our experimental observations allow us to approximate the strength of Cu at high strains and strain rates, revealing a unique diagnostic method for use at these extreme conditions.

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Type
Papers
Copyright
Copyright © Cambridge University Press 2012

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