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Microcrack- and microvoid-related impact damage and ignition responses for HMX-based polymer-bonded explosives at high temperature
Defence Technology ( IF 5.1 ) Pub Date : 2021-07-17 , DOI: 10.1016/j.dt.2021.07.006
Hai-jiao Xue 1 , Yan-qing Wu 1 , Kun Yang 1 , Yi Wu 2
Affiliation  

Investigating the damage and ignition behaviors of polymer-bonded explosive (PBX) under a coupled impact and high-temperature loading condition is required for the safe use of charged PBXs. An improved combined microcrack and microvoid model (CMM) was developed for better describing the thermal effects of deformation, damage, and ignition responses of PBXs. The main features of the model under typical dynamic loadings (i.e. uniaxial tension and compression, and lateral confinement) at different initial temperature were first studied. And then the effects of temperature on impact-shear sensitivity of HMX-based PBXs were investigated. The results showed that the ignition threshold velocity of shear-crack hotspots exhibits an increase from 260 to 270 to 315–325 m/s when initial temperature increases from 301 to 348 K; and then the threshold velocity decreases to 290–300 m/s with the initial temperature continually increasing to 378 K. The predicted ignition threshold velocity level of the explosives under coupled impact and high temperature loading conditions were consistent with the experimental data.



中文翻译:

高温下基于 HMX 的聚合物粘结炸药的微裂纹和微孔相关冲击损伤和点火响应

为了安全使用带电 PBX,需要研究聚合物粘合炸药 (PBX) 在耦合冲击和高温负载条件下的损坏和点火行为。为了更好地描述 PBX 的变形、损坏和点火响应的热效应,开发了改进的微裂纹和微孔洞组合模型 (CMM)。首先研究了模型在不同初始温度下典型动态载荷(即单轴拉压和侧向约束)下的主要特征。然后研究了温度对基于 HMX 的 PBX 的冲击剪切灵敏度的影响。结果表明,当初始温度从301增加到348 K时,剪切裂纹热点的着火阈值速度从260增加到270增加到315-325 m/s;

更新日期:2021-07-17
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