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 Hai-jiao Xue;Yan-qing Wu;Kun Yang;Yi Wu

作者机构：State Key Laboratory of Explosion Science and TechnologyBeijing Institute of TechnologyBeijing100081China School of Aerospace EngineeringBeijing Institute of TechnologyBeijing100081China 

出 版 物：《Defence Technology（防务技术）》 (Defence Technology)

年 卷 期：2022年第18卷第9期

页      面：1602-1621页

核心收录：

学科分类：082604[工学-军事化学与烟火技术] 08[工学] 0826[工学-兵器科学与技术] 

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 

主　　题：PBX Thermal-mechanical coupling Numerical simulation Impact Sensitivity 

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.