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Title: Nonisentropic Release of a Shocked Solid

Journal Article · · Physical Review Letters
 [1];  [1];  [1];  [2];  [3];  [2];  [4];  [2];  [5];  [5];  [2];  [2];  [2];  [1];  [2];  [5];  [2]; ORCiD logo [1]
  1. Univ. of Oxford (United Kingdom). Dept. of Physics, Clarendon Lab.
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of York (United Kingdom). York Plasma Inst.
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)

Here, we introduce molecular dynamics simulations of shock and release in micron-scale tantalum crystals that exhibit postbreakout temperatures far exceeding those expected under the standard assumption of isentropic release. We illustrate 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.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Grant/Contract Number:
89233218CNA000001; AC02-76SF00515; AC52-07NA27344
OSTI ID:
1583129
Report Number(s):
LA-UR-21-22819; LLNL-JRNL--800047; LLNL-JRNL-800047
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 123; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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