Ignition mechanism and chemical reaction of the micro-damage polymer-bonded explosives under different inertial loading conditions

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing Pub Date : 2024-08-01 DOI:10.1016/j.polymertesting.2024.108532

Fengwei Guo, Wenzheng Xu, Yamei Wei, Xianpeng Tan, Xin Zheng, Junyi Wang, Leyang Zhao, Yulong Yang

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引用次数: 0

Abstract

Understanding the impact-induced ignition properties and energy release behavior of polymer-bonded explosives (PBXs) is critical for the safety of explosive systems. In this study, a new impact test component was designed using a light gas gun to quantify the ignition mechanism and chemical reaction of micro-damaged PBXs under different inertial loading conditions. A constitutive model was developed to describe the mechanical-thermal-chemical response of the PBXs. This model was employed to further investigate the correlation between microcracks, debonding, hot spots, and chemical reactions. The results show that the stress state of the material is not uniformly distributed due to the micro-inhomogeneities and structural defects of PBXs. The shear friction of the microcracks contributes to localized hot spots, thereby inducing ignition. The critical loading condition for ignition is the length of the steel pillar is 32 mm. The damage and hotspot temperatures of the anterior lateral and posterior lateral regions are greater than those of other locations. The ignition response is accentuated with longer steel pillars, resulting in a more violent release of energy.

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不同惯性加载条件下微损伤聚合物结合炸药的点火机理和化学反应

了解聚合物粘结炸药（PBX）的冲击诱发点火特性和能量释放行为对爆炸系统的安全至关重要。在这项研究中，设计了一种新的冲击试验组件，使用轻型气枪来量化微损伤 PBX 在不同惯性加载条件下的点火机制和化学反应。建立了一个构成模型来描述 PBX 的机械-热-化学反应。利用该模型进一步研究了微裂纹、脱粘、热点和化学反应之间的相关性。结果表明，由于 PBX 的微观均质性和结构缺陷，材料的应力状态并不是均匀分布的。微裂缝的剪切摩擦会产生局部热点，从而诱发点火。点火的临界加载条件是钢支柱的长度为 32 毫米。前外侧和后外侧区域的损坏和热点温度高于其他位置。钢柱越长，点火反应越明显，能量释放越剧烈。

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来源期刊

Polymer Testing 工程技术-材料科学：表征与测试

CiteScore

10.70

自引率

5.90%

发文量

328

审稿时长

44 days

期刊介绍： Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.