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Volume 33 Issue 1
Jan 2019
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Chinese Journal of High Pressure Physics  > 2019  >  33(1): 012301.
ZHANG Jiawei, HUANG Shenghong. Acceleration Evaluation Model of Metal/Gas Interface by Extra Electric Field Induced by Shock under Extreme Impacting Conditions[J]. Chinese Journal of High Pressure Physics, 2019, 33(1): 012301. doi: 10.11858/gywlxb.20180607
Citation: ZHANG Jiawei, HUANG Shenghong. Acceleration Evaluation Model of Metal/Gas Interface by Extra Electric Field Induced by Shock under Extreme Impacting Conditions[J]. Chinese Journal of High Pressure Physics, 2019, 33(1): 012301. doi: 10.11858/gywlxb.20180607
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Acceleration Evaluation Model of Metal/Gas Interface by Extra Electric Field Induced by Shock under Extreme Impacting Conditions

doi: 10.11858/gywlxb.20180607

  • CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, China

  • Received Date: 31 Jul 2018
  • Rev Recd Date: 04 Sep 2018
    Abstract
  • The evolution processes of metal/gas (Li/H2) interface at extreme impacting conditions (22.50–78.75 km/s) were numerically studied by molecular dynamics (MD) method incorporated with the electron force field (eFF) model. It was found that the strong shock compression leads to ionization and the electron/ion separation is produced due to different diffusivities of ions and electrons. Then a strong extra electric field was established adjacent to shock font. Through 1D statistic along shock propagating direction from MD results and theoretical analysis, it was found that the electron/ion separation is moving with shock and the intensity and width of electron/ion separation zone are kept to be constant during shock propagating process and determined by shock strength. Further integrating the extra electric field and extra acceleration of metal material adjacent to the interface, the time histories of material acceleration were obtained. It was found that the extra material acceleration curves were in accordance with Rayleigh model. The key parameters were fitted based on computation results. Finally, an empirical extra acceleration evaluation model of metal material on Li/H2 interface under impact velocity range of 20–80 km/s was established.

     

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