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Chinese Journal of High Pressure Physics  > 2011  >  25(5): 469-474 .
JIA Xian-Zhen, CHEN Song, YANG Jian, WANG Jian-Ling. Numerical Study of Explosives Initiation by Simultaneous Impact from Two Fragments[J]. Chinese Journal of High Pressure Physics, 2011, 25(5): 469-474 . doi: 10.11858/gywlxb.2011.05.014
Citation: JIA Xian-Zhen, CHEN Song, YANG Jian, WANG Jian-Ling. Numerical Study of Explosives Initiation by Simultaneous Impact from Two Fragments[J]. Chinese Journal of High Pressure Physics, 2011, 25(5): 469-474 . doi: 10.11858/gywlxb.2011.05.014
shu

Numerical Study of Explosives Initiation by Simultaneous Impact from Two Fragments

doi: 10.11858/gywlxb.2011.05.014

  • Xi'an Modern Chemistry Institute, Xi'an 710065, China

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  • Corresponding author: JIA Xian-Zhen
  • Received Date: 07 Jun 2010
  • Rev Recd Date: 26 Oct 2010
  • Issue Publish Date: 15 Oct 2011
    Abstract
  • The explosives initiation by simultaneous impact from two fragments was simulated based on Lee-Tarver ignition and growth model by using finite element code LS-DYNA. In order to verify the simulation method and parameters, the courses that tungsten spheres with different diameters impacted tantalum covered Composition B charges were simulated, and the critical velocity to ignite Composition B was gained, which accorded well with the experimental results. The problems that two tungsten spheres with three kinds of diameters impacted Composition B charges were simulated. It can be found that the critical velocity to ignite explosives by two fragments, which was lower than one tungsten sphere condition, varied with the distance between the two fragments approximately in term of parabolic curve. When the impact velocity was equal to or slightly larger than the critical velocity, there can be different shapes of detonation wave appearing in the charge, including spherical, W-shape, V-shape, VW-shape and so on.

     

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    • References(14)
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