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A Modified Mesoscopic Reaction Rate Model for Shock Initiation of PBXs
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1.The State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;2.Nuclear and Radiation Safety Center, Ministry of Environmental Protection, Beijing 100082, China;3.Institute of Technical Physics, College of Science, National University of Defense Technology, Changsha 410073, China

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    Abstract:

    To systemly investigate the influence of the mesostructure and the shock loadings on the shock initiation and detonation of polymer bonded explosives (PBXs), a modified Duan-Zhang-Kim(DZK)mesoscopic reaction rate model is proposed. A burn-up and a porosity factors are introduced to describe effects of the outer burning on the surfaces of grains of the explosive at the low-pressure slow reactive stage and the initial charge density, respectively. The calculated pressure-time histories inside the HMX-based PBXC03 explosive samples using the modified model with one set of parameters are in good agreement with the experimental data, which indicates that this model can be used to well predicate the influence of the particle size, the porosity and the shock loading on the shock initiation (i.e., ignition and detonation growth) processes of PBXs. Moreover, it is also observed that the detonation grows fastest in the explosive with a moderate porosity. And the smaller the particle size of the explosive is, the more difficult the explosive can be ignited, in which the detonation grows fastest once the explosive is ignited.

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白志玲,段卓平,温丽晶,等. PBX炸药冲击起爆的改进细观反应速率模型[J].含能材料,2019,27(8):629-635.
BAI Zhi-ling, DUAN Zhuo-ping, WEN Li-jing, et al. A Modified Mesoscopic Reaction Rate Model for Shock Initiation of PBXs[J]. Chinese Journal of Energetic Materials,2019,27(8):629-635.

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History
  • Received:December 18,2018
  • Revised:April 23,2019
  • Adopted:January 29,2019
  • Online: April 22,2019
  • Published: August 25,2019