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- Title
Microcrack- and microvoid-related impact damage and ignition responses for HMX-based polymer-bonded explosives at high temperature.
- Authors
Hai-jiao Xue; Yan-qing Wu; Kun Yang; Yi Wu
- Abstract
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 315e325 m/s when initial temperature increases from 301 to 348 K; and then the threshold velocity decreases to 290e300 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.
- Subjects
AUTOMOBILE ignition; POLYMERS; EXPLOSIVES; COMPRESSION loads; HEAT resistant materials
- Publication
Defence Technology, 2022, Vol 18, Issue 9, p1602
- ISSN
2096-3459
- Publication type
Article
- DOI
10.1016/j.dt.2021.07.006