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

doi:10.1088/1674-1056/25/8/086202

Abstract 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 (P_SB) inducing a solid-liquid phase transition upon shock or release. It is found that the total ejecta mass changing with P_SB under 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 P_SB. 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.

Keywords: ejecta mass total amount shock wave profiles jet velocity difference

Received: 03 February 2016
Revised: 22 March 2016
Accepted manuscript online:

PACS:	62.20.M-	(Structural failure of materials)
	62.50.-p	(High-pressure effects in solids and liquids)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11472254 and 11272006).

Corresponding Authors: Guo-Wu Ren
E-mail: guowu.ren@yahoo.com

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Guo-Wu Ren(任国武), Shi-Wen Zhang(张世文), Ren-Kai Hong(洪仁楷), Tie-Gang Tang(汤铁钢), Yong-Tao Chen(陈永涛) Influence of shockwave profile on ejecta from shocked Pb surface: Atomistic calculations 2016 Chin. Phys. B 25 086202

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

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