Shock initiation of multi-component insensitive PBX explosives: Experiments and MC-DZK mesoscopic reaction rate model

Zhiling Bai; Zhuoping Duan; Lijing Wen; Zhenyu Zhang; Zhuocheng Ou; Fenglei Huang

doi:10.1016/j.jhazmat.2019.02.028

Shock initiation of multi-component insensitive PBX explosives: Experiments and MC-DZK mesoscopic reaction rate model

J Hazard Mater. 2019 May 5:369:62-69. doi: 10.1016/j.jhazmat.2019.02.028. Epub 2019 Feb 10.

Authors

Zhiling Bai¹, Zhuoping Duan², Lijing Wen³, Zhenyu Zhang⁴, Zhuocheng Ou¹, Fenglei Huang¹

Affiliations

¹ The State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China.
² The State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China. Electronic address: duanzp@bit.edu.cn.
³ The State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China; Nuclear and Radiation Safety Center, Ministry of Environmental Protection, Beijing, 100082, China.
⁴ Institute of Technical Physics, College of Science, National University of Defense Technology, Changsha, 410073, China.

PMID: 30772688
DOI: 10.1016/j.jhazmat.2019.02.028

Abstract

To facilitate the pre-estimation and optimization of the prescription design of a multi-component polymer bonded explosive (PBX), a multicomponent mesoscopic reaction rate model (MC-DZK model) is developed to predicate preferably the influence of both the explosive components and the particle size of on the shock initiation. All the parameters in the model are determined directly by the parameters in the DZK model for each explosive component. Furthermore, for the multicomponent insensitive explosive PBXC10 (70% TATB, 25% HMX, and 5% Kel-F800 by weight) with different explosive particle sizes, both shock initiation experiments and corresponding numerical simulations are performed, and there is satisfactory agreement between the numerical results and the available experimental data. It is found that the pressure histories present as a shape of step increase during the whole shock initiation process, which is resulted mainly from the rapid chemical reaction rate just behind the precursory shock wave front. It is also found that the smaller the size of the explosive particulates, the faster the pressure grows on the precursory shock wave front, the shorter the run distance to detonation, and the higher the chemical reaction rate just behind the precursory shock wave front.

Keywords: Multicomponent PBXs; Multicomponent mesoscopic reaction rate model; One-dimensional Lagrangian experimental system; Particle size; Shock initiation.