Influence of shockwave profile on ejecta from shocked Pb surface：Atomistic calculations

We conduct molecular dynamics simulations of the ejection process from a grooved Pb surface subjected to supported and unsupported shock waves with various shock-breakout pressures（PSB） inducing a solid–liquid phase transition upon shock or release. It is found that the total ejecta mass changing wi...

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Bibliographic Details
Published in:Chinese physics B 2016-08, Vol.25 (8), p.274-278
Main Author: 任国武 张世文 洪仁楷 汤铁钢 陈永涛
Format: Article
Language:English
Subjects:
Antimony
Ejecta
Ejection
Mathematical analysis
Molecular dynamics
Origins
Shock waves
Simulation
冲击波
分子动力学模拟
剖面
喷出物
大速差射流
表面
计算
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Summary:We conduct molecular dynamics simulations of the ejection process from a grooved Pb surface subjected to supported and unsupported shock waves with various shock-breakout pressures（PSB） inducing a solid–liquid phase transition upon shock or release. It is found that the total ejecta mass changing with PSBunder a supported shock reveals a similar trend with that under an unsupported shock and the former is always less than the latter at the same PSB. The origin of such a discrepancy could be unraveled that for an unsupported shock, a larger velocity difference between the jet tip and its bottom at an early stage of jet formation results in more serious damage, and therefore a greater amount of ejected particles are produced. The cumulative areal density distributions also display the discrepancy. In addition, we discuss the difference of these simulated results compared to the experimental findings.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/25/8/086202