高能晶体粘结剂体系中微尺度缺陷的冲击起爆机制

IF 1.7 4区 工程技术 Q3 MECHANICS
P. Das, H. S. Udaykumar
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引用次数: 3

摘要

含能材料的晶体,如1,3,5,7-四硝基-1,3,5,7-四氮烷(HMX),嵌入在塑料粘合剂中是塑料粘合炸药(PBX)的基本组成部分。这种非均质含能材料具有显微结构特征,如尖角、晶体和粘结剂之间的界面、颗粒内和颗粒外空隙以及其他缺陷。在激波与微观结构非均质相互作用过程中,会产生能量局域化或“热点”,导致pbx的产生。本文通过高分辨率的数值模拟来阐明PBX中激波引发的机理细节;我们研究了四种不同的机制:(1)尖锐角落或边缘的冲击聚焦及其对晶体形状和施加冲击强度的依赖;(2)晶体与粘结剂界面脱粘;(3)粘结剂中靠近HMX晶体的空洞塌陷;(4) HMX晶体内空隙的坍缩。深入了解了这些机制对热点的点火和生长的相对贡献。了解这些能量局部化机制及其对pbx热点形成和起爆灵敏度的相对重要性,将有助于设计具有可控灵敏度的含能材料驱动系统,以防止意外起爆并确保可靠的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Mechanisms of shock-induced initiation at micro-scale defects in energetic crystal-binder systems

Mechanisms of shock-induced initiation at micro-scale defects in energetic crystal-binder systems

Crystals of energetic materials, such as 1,3,5,7-Tetranitro-1,3,5,7-tetrazocane (HMX), embedded in plastic binders are the building blocks of plastic-bonded explosives (PBX). Such heterogeneous energetic materials contain microstructural features such as sharp corners, interfaces between crystal and binder, intra- and extra-granular voids, and other defects. Energy localization or “hotspots” arise during shock interaction with the microstructural heterogeneities, leading to initiation of PBXs. In this paper, high-resolution numerical simulations are performed to elucidate the mechanistic details of shock-induced initiation in a PBX; we examine four different mechanisms: (1) shock-focusing at sharp corners or edges and its dependency on the shape of the crystal and the strength of the applied shock; (2) debonding between crystal and binder interfaces; (3) collapse of voids in the binder located near an HMX crystal; and (4) the collapse of voids within HMX crystals. Insights are obtained into the relative contributions of these mechanisms to the ignition and growth of hotspots. Understanding these mechanisms of energy localization and their relative importance for hotspot formation and initiation sensitivity of PBXs will aid in the design of energetic material-driven systems with controlled sensitivity, to prevent accidental initiation and ensure reliable performance.

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来源期刊
Shock Waves
Shock Waves 物理-力学
CiteScore
4.10
自引率
9.10%
发文量
41
审稿时长
17.4 months
期刊介绍: Shock Waves provides a forum for presenting and discussing new results in all fields where shock and detonation phenomena play a role. The journal addresses physicists, engineers and applied mathematicians working on theoretical, experimental or numerical issues, including diagnostics and flow visualization. The research fields considered include, but are not limited to, aero- and gas dynamics, acoustics, physical chemistry, condensed matter and plasmas, with applications encompassing materials sciences, space sciences, geosciences, life sciences and medicine. Of particular interest are contributions which provide insights into fundamental aspects of the techniques that are relevant to more than one specific research community. The journal publishes scholarly research papers, invited review articles and short notes, as well as comments on papers already published in this journal. Occasionally concise meeting reports of interest to the Shock Waves community are published.
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