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DOE OSTI · 1583129

Nonisentropic Release of a Shocked Solid

Heighway, P. G.·Sliwa, M.·McGonegle, D.·Wehrenberg, C.·Bolme, C. A.·Eggert, J.·Higginbotham, A.·Lazicki, A.·Lee, H. J.·Nagler, B.·Park, H. -S.·Rudd, R. E.·Smith, R. F.·Suggit, M. J.·Swift, D.·Tavella, F.·Remington, B. A.·Wark, J. S.
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Abstract

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.

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75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITYEngineering - Mechanical and civil engineering, Materials science, Physics - Condensed matter physics

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BibTeXRIS

Heighway, P. G., Sliwa, M., McGonegle, D., Wehrenberg, C., Bolme, C. A., Eggert, J., Higginbotham, A., Lazicki, A., Lee, H. J., Nagler, B., Park, H. -S., Rudd, R. E., Smith, R. F., Suggit, M. J., Swift, D., Tavella, F., Remington, B. A., Wark, J. S.. 2019-12-13. Nonisentropic Release of a Shocked Solid. https://doi.org/10.1103/physrevlett.123.245501

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