Publications by Justin Wark

Non-isentropic release of a shocked solid

Physical Review Letters American Physical Society 123 (2019) 245501

PG Heighway, M Sliwa, D McGonegle, C Wehrenberg, CA Bolme, J Eggert, A Higginbotham, A Lazicki, HJ Lee, B Nagler, H-S Park, RE Rudd, RF Smith, MJ Suggit, D Swift, F Tavella, BA Remington, J Wark

We present 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 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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