Optimization of mechanical and safety properties by designing interface characteristics within energetic composites

IF 5.1 2区 工程技术 Q1 Engineering
Guijun Wang, Yanqing Wu, Kun Yang, Quanzhi Xia, Fenglei Huang
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引用次数: 0

Abstract

The interfacial structure has an important effect on the mechanical properties and safety of the energetic material. In this work, a mesostructure model reflecting the real internal structure of PBX is established through image digital modeling and vectorization processing technology. The microscopic molecular structure model of PBX is constructed by molecular dynamics, and the interface bonding energy is calculated and transferred to the mesostructure model. Numerical simulations are used to study the influence of the interface roughness on the dynamic compression and impact ignition response of PBX, and to regulate and optimize the mechanical properties and safety of the explosive to obtain the optimal design of the surface roughness of the explosive crystal. The results show that the critical hot spot density of PBX ignition under impact loading is 0.68 mm. The improvement of crystal surface roughness can improve the mechanical properties of materials, but at the same time it can improve the impact ignition sensitivity and reduce the safety of materials. The optimal friction coefficient range for the crystal surface that satisfies both the mechanical properties and safety of PBX is 0.06–0.12. This work can provide a reference basis for the formulation design and production processing of energetic materials.
通过设计高能复合材料的界面特性优化机械和安全性能
界面结构对高能材料的力学性能和安全性有重要影响。本研究通过图像数字建模和矢量化处理技术,建立了反映 PBX 真实内部结构的介观结构模型。通过分子动力学方法构建了 PBX 的微观分子结构模型,计算了界面键能并将其转移到中观结构模型中。利用数值模拟研究了界面粗糙度对 PBX 动态压缩和冲击点火响应的影响,并对炸药的力学性能和安全性进行了调控和优化,获得了炸药晶体表面粗糙度的最优设计。结果表明,PBX 在冲击加载下点燃的临界热点密度为 0.68 mm。晶体表面粗糙度的改善可以提高材料的机械性能,但同时也会提高冲击点火敏感性,降低材料的安全性。同时满足 PBX 力学性能和安全性的晶体表面最佳摩擦系数范围为 0.06-0.12。这项工作可为高能材料的配方设计和生产加工提供参考依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Defence Technology
Defence Technology Engineering-Computational Mechanics
CiteScore
7.50
自引率
7.80%
发文量
1248
审稿时长
22 weeks
期刊介绍: Defence Technology, sponsored by China Ordnance Society, is published quarterly and aims to become one of the well-known comprehensive journals in the world, which reports on the breakthroughs in defence technology by building up an international academic exchange platform for the defence technology related research. It publishes original research papers having direct bearing on defence, with a balanced coverage on analytical, experimental, numerical simulation and applied investigations. It covers various disciplines of science, technology and engineering.
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