Ejecta production from shocked Pb surface via molecular dynamics

GW Ren and YT Chen and TG Tang and QZ Li, JOURNAL OF APPLIED PHYSICS, 116, 133507 (2014).

DOI: 10.1063/1.4896902

Molecular dynamics simulations are employed to examine the relation between ejecta production and shock-breakout pressure for single crystal Pb subjected to a decaying shockwave loading. To better understand the physical mechanism of ejecta formation, a surface with multiple triangular grooves representing the imperfections left from machining finish is taken into consideration. It is found that the ejecta volume density distribution displays a smooth nature and the amount of ejecta increases significantly after melting on release or shock. Additionally, the ejecta particle mass distribution is captured by a power law scaling, revealing the self-similarity. These results are in reasonable agreement with the characteristics of experimentally diagnosed findings. (C) 2014 AIP Publishing LLC.

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