Page 87 - 《含能之美》2019封面论文

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Numerical Simulation on the Influence of the Initial Crack on Polymer Bonded Explosive Ignition Under Low
Velocity Impact

LIU Rui，HAN Yong，DAI Xiao⁃gan，LI Ming，WANG Jun
（Institute of Chemical Materials，CAEP，Mianyang 621999，China）

Abstract：Visco ⁃ SCRAM model was applied to study on the influence of the initial crack on Octogen（HMX）⁃ based polymer
bonded explosive（PBX）ignition under low velocity impact. By means of the simulation of the standard low impact Steven test，
the influence of the initial crack length and its distribution on the temperature rise and the hotspot formation was analyzed. The
simulation results demonstrate that as the increment of the initial crack length，the friction work between the surfaces of the micro
⁃cracks is strengthened，which brought in high temperature rise and further the hotspot is formed more easily. When the initial
crack length is increased from 1mm to 3mm，the ignition impact threshold velocity is reduced from 45 m∙s -1 to 38 m∙s . Consid⁃
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ering the heterogeneous initial crack，during the low velocity impact，the temperature rise region is obviously changed. More⁃
over，the hotspot formation is beneficial of the heterogeneous initial crack，and further it resulted in the reduction of the ignition
impact threshold velocity. When the distribution of the initial crack follows the uniform distribution U（0.8，1.2），the ignition im⁃
pact threshold velocity is 36 m∙s . When the distribution of the initial crack follows the normal distribution N（1，0.115），the ig⁃
-1
-1
nition impact threshold velocity is 31 m∙s .
Key words：explosion mechanics；initial crack；polymer bonded explosive；low velocity impact；ignition velocity threshold
CLC number：O389 Document code：A DOI：10.11943/CJEM2019152
（责编：高 毅）

Chinese Journal of Energetic Materials，Vol.27, No.10, 2019（812-818） 含能材料 www.energetic-materials.org.cn