Non-isentropic release of a shocked solid

Non-isentropic release of a shocked solid

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 fro...

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Hlavní autoři: Heighway, P, Sliwa, M, McGonegle, D, Wehrenberg, C, Bolme, C, Eggert, J, Higginbotham, A, Lazicki, A, Lee, H, Nagler, B, Park, H, Rudd, R, Smith, R, Suggit, M, Swift, D, Tavella, F, Remington, B, Wark, J
Médium: Journal article
Vydáno: American Physical Society 2019
Popis
Shrnutí: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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