Damage mode and characterization of RDX-based PBX explosive under tri-axial impact loading
CAI Xuanming1，ZHANG Wei2，GAO Yubo1，FAN Zhiqiang1
1. North University of China，Underground target damage technology National Defense key subject Laboratory, Taiyuan 030051, China；
2. Harbin Institute of Technology, High-speed Impact Research Center, Harbin 150080, China
Abstract：Missile warheads with a high speed often explode ahead of time due to damage when attacking and penetrating underground targets to greatly weaken their damage to targets and even affect the whole strategic situation. Here, aiming at this problem to be solved urgently, damage characteristics of RDX-based PBX explosive in missile warheads were studied under high G-value loading. Based on the first-stage light gas cannon, a series of tests were conducted to study damage characteristics of PBX explosive specimens under tri-axial impact loading. Combining with numerical simulation, Griffith crystal particles’ micro-crack fracture strength and the scanning electronic microscope (SEM), the damage mode of PBX explosive specimens was studied and characterized. The quantitative relationship between specimens’ density after tests and impact loading was also explored. The results showed that the shear strength between crystal particle surface and binder is about 0.3 Mpa, so shear de-bonding phenomena occur under smaller impact loads; with increase in three-axial impact load pressure, crystal particle twin zone, particle fragmentation and melted meso-damage mode gradually appear; the modified Boltzmann relationship between specimens’ density after tests and impact load pressure is basically consistent to test results; the prediction results of Griffith crystal particles’ micro-crack fracture strength agree well with the measurement and analysis results of SEM, they provide an important basis for studying the meso-damage mechanism of PBX explosive.
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