Research on the Size of Defects inside RDX/HMX Crystal and Shock Sensitivity

Authors

  • Cheng Hua,

    1. Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianshan Road NO.64, Mianyang 621900, P. R. China
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  • Pan-Jun Zhang,

    Corresponding author
    1. Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianshan Road NO.64, Mianyang 621900, P. R. China
    • Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianshan Road NO.64, Mianyang 621900, P. R. China

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  • Xiao-Jun Lu,

    1. Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianshan Road NO.64, Mianyang 621900, P. R. China
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  • Ming Huang,

    1. Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianshan Road NO.64, Mianyang 621900, P. R. China
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  • Bin Dai,

    1. Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianshan Road NO.64, Mianyang 621900, P. R. China
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  • Hua Fu

    1. Institute of Physics, China Academy of Engineering Physics (CAEP), Mianshan Road NO.64, Mianyang 621900, P. R. China
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Abstract

Intragranular defects inside RDX/HMX were studied by optical microscopy with matching refractive (OMS), sink-float method (SFM), and micro-focus CT (μCT) techniques. OMS results revealed the phenomenon that RDX/HMX had more defects and cracks than RS-RDX/RS-HMX. μCT results indicated that RDX/HMX had more defects with larger volume than RS-RDX/RS-HMX. The gap test showed that critical shock pressure/gap thickness was 6.4 GPa/19.4 mm for PBX based on RDX, while they were 7.5 GPa/17.5 mm and 8.6 GPa/16.2 mm for PBX based on M-RDX and RS-RDX, respectively. Meanwhile, an analysis of the relationship between defects inside RDX/HMX crystal and shock sensitivity was made. Finally, the shock pressure response under impact loading was investigated by discrete element method.

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