Nonisentropic Release of a Shocked Solid.
Nonisentropic Release of a Shocked Solid.
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DOI：
10.1103/physrevlett.123.245501
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发表时间：
2019-12
影响因子：
8.6
通讯作者：
P. Heighway;M. Sliwa;D. McGonegle;C. Wehrenberg;C. Bolme;J. Eggert;A. Higginbotham;A. Lazicki;H. J. Lee;B. Nagler;Hye-Sook Park;R. Rudd;Raymond F. Smith;M. Suggit;D. Swift;F. Tavella;B. Remington;J. Wark
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文献类型：
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作者：
P. Heighway;M. Sliwa;D. McGonegle;C. Wehrenberg;C. Bolme;J. Eggert;A. Higginbotham;A. Lazicki;H. J. Lee;B. Nagler;Hye-Sook Park;R. Rudd;Raymond F. Smith;M. Suggit;D. Swift;F. Tavella;B. Remington;J. Wark
我们提出了在微米尺度钽晶体中激波和释放的分子动力学模拟，这些晶体的爆发后温度远远超过了等熵释放标准假设下的预期温度。我们通过能量预算分析表明，这是由于材料强度产生的塑料功加热在很大程度上抵消了热弹性冷却。通过原位x射线衍射从钽箔的热应变推导出激光冲击后钽箔的释放温度，结果与冲击后的释放温度接近。
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.