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Phys. Rev. E 78, 066115 (2008) [9 pages]

Shock formation and the ideal shape of ramp compression waves

Damian C. Swift
Condensed Matter and Materials Division,Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA

Richard G. Kraus
Department of Physics, Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom

Eric N. Loomis
Group P-24, Los Alamos National Laboratory, Mail Stop E526, Los Alamos, New Mexico 87545, USA

Damien G. Hicks
V Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA

James M. McNaney
Condensed Matter and Materials Division,Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA

Randall P. Johnson
Group P-24, Los Alamos National Laboratory, Mail Stop E526, Los Alamos, New Mexico 87545, USA
Received 4 June 2008; published 29 December 2008

We derive expressions for shock formation based on the local curvature of the flow characteristics during dynamic compression. Given a specific ramp adiabat, calculated for instance from the equation of state for a substance, the ideal nonlinear shape for an applied ramp loading history can be determined. We discuss the region affected by lateral release, which can be presented in compact form for the ideal loading history. Example calculations are given for representative metals and plastic ablators. Continuum dynamics (hydrocode) simulations were in good agreement with the algebraic forms. Example applications are presented for several classes of laser-loading experiment, identifying conditions where shocks are desired but not formed, and where long-duration ramps are desired.

©2008 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevE.78.066115
DOI: 10.1103/PhysRevE.78.066115
PACS: 62.20.F-; 07.35.+k; 52.38.Mf; 62.50.-p
  • 62.20.F-
    Deformation and plasticity of solids
  • 07.35.+k
    High-pressure apparatus; shock tubes; diamond anvil cells
  • 52.38.Mf
    Laser ablation
  • 62.50.-p
    High-pressure effects in solids and liquids
  • YEAR: 2008
KEYWORDS: flow simulation, shock waves

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