期刊
DEFENCE TECHNOLOGY
卷 18, 期 9, 页码 1602-1621出版社
KEAI PUBLISHING LTD
DOI: 10.1016/j.dt.2021.07.006
关键词
PBX; Thermal-mechanical coupling; Numerical simulation; Impact; Sensitivity
资金
- China National Nature Science Foundation [11872119]
- China Postdoctoral Science Foundation [BX20200046, 2020M680394]
- Pre-research Project of Armament [6142A03202002]
The damage and ignition behaviors of polymer-bonded explosive (PBX) under a coupled impact and high-temperature loading condition were investigated. An improved model was developed to describe the thermal effects of deformation, damage, and ignition responses of PBXs. The study showed that temperature affects the impact-shear sensitivity of HMX-based PBXs, and the predicted values were consistent with experimental data.
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. (c) 2022 China Ordnance Society. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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