Molecular Dynamics Simulation on the Non-thermal Equilibrium State of Plasma Induced by Hypervelocity Impact
Abstract
The plasma phase transition in monocrystalline aluminum under hypervelocity impact is simulated using the effective core pseudo-potential method in the molecular dynamics. Firstly, plasma characteristics and energy change are revealed. By contrast with the non-thermal equilibrium theoretical analysis, the simulation evidently demonstrates the non-thermal equilibrium state of the plasma in the initial stage of the hypervelocity impact. The transition time from the non-equilibrium to equilibrium is then estimated. Finally, the phenomenon of the charge separation at the shock wave front in the plasma and the compensation effect of this separation for the shock wave velocity are emphasized.
- Publication:
-
Journal of the Physical Society of Japan
- Pub Date:
- May 2019
- DOI:
- 10.7566/JPSJ.88.054001
- Bibcode:
- 2019JPSJ...88e4001G