Microcrack-and microvoid-related impact damage and ignition responses for HMX-based polymer-bonded explosives at high temperature  

作　　者：Hai-jiao Xue Yan-qing Wu Kun Yang Yi Wu 

机构地区：[1]State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing,100081,China [2]School of Aerospace Engineering,Beijing Institute of Technology,Beijing,100081,China

出　　处：《Defence Technology（防务技术）》2022年第9期1602-1621,共20页Defence Technology

基　　金：the China National Nature Science Foundation (Grant no. 11872119);China Postdoctoral Science Foundation (BX20200046, 2020M680394);Pre-research Project of Armament (6142A03202002) for supporting this project。

摘　　要：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.

关 键 词：PBX Thermal-mechanical coupling Numerical simulation Impact Sensitivity 

分 类 号：TQ560.1[化学工程—炸药化工]