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Nonisentropic Release of a Shocked Solid

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Author(s)

  • Patrick Heighway
  • M. Sliwa
  • David McGonegle
  • C. E. Wehrenberg
  • C. Bolme
  • J.H. Eggert
  • Andrew Higginbotham
  • A. E. Lazicki
  • Hae Ja Lee
  • Bob Nagler
  • Hye-Sook Park
  • R. E. Rudd
  • R. F. Smith
  • Mathew Suggit
  • D. C. Swift
  • F. Tavella
  • Bruce A. Remington
  • J S Wark

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Publication details

JournalPhysical Review Letters
DateAccepted/In press - 9 Oct 2019
DatePublished (current) - 13 Dec 2019
Volume123
Number of pages6
Original languageEnglish

Abstract

We present molecular dynamics (MD) simulations of shock and release in micron-scale tantalum crystals that exhibit post-breakout temperatures far exceeding those expected under the standard assumption of isentropic release. We show via an energy-budget analysis that this is due to plastic-work heating from material strength that largely counters thermoelastic cooling. The simulations are corroborated by experiments where the release temperatures of laser-shocked tantalum foils are deduced from their thermal strains via in situ x-ray diffraction, and are found to be close to those behind the shock.

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