Energy localization in HMX-Estane polymer-bonded explosives during impact loading
Energy localization in HMX-Estane polymer-bonded explosives during impact loading
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DOI：
10.1063/1.3688350
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发表时间：
2012-03-01
影响因子：
3.2
通讯作者：
Zhou, M.
中科院分区：
文献类型：
--
作者：
Barua, A.;Horie, Y.;Zhou, M.
本文报道了HMX（高熔点炸药八氢-1，3，5，7-四硝基-1，2，3，5-四氮杂辛）/Estane PBX体系在动态加载过程中能量局域化的机理研究结果。重点是在不同的约束条件下，在10（4）- 10（5）s（-1）的应变速率范围内的热-机械响应。最近开发的凝聚力有限元方法被用来跟踪和分析从不同的成分，界面，变形和断裂机制，和内部摩擦加热的贡献。特别是，能量耗散由于粘弹性变形，晶粒断裂，界面脱粘，和摩擦沿着裂纹面被量化为时间和整体变形的函数。所分析的材料具有0.69和0.82之间的HMX体积分数。计算表明，应变率的变化可以显着影响的空间分布，但不是热点的总数。更高的围压应力导致粘合剂中更强烈的加热和更均匀的热点分布。热点的演变被量化为加载条件，变形和微观结构属性的函数。所得的微结构-响应关系可用于含能复合材料起爆感度的评估。(C)2012年美国物理学会。[http：//dx.doi.org/10.1063/1.3688350]
We report the results of a mechanistic study of energy localization in a HMX (High Melting point eXplosive octahydro-1,3,5,7-tetranitro-1,2,3,5-tetrazocine)/Estane PBX system during dynamic loading. The focus is on the thermal-mechanical response over the strain rate range of 10(4) - 10(5) s(-1) under different confinement conditions. A recently developed cohesive finite element method is used to track and analyze the contributions to heating from different constituents, interfaces, deformation and fracture mechanisms, and internal friction. In particular, energy dissipations due to viscoelastic deformation, grain fracture, interfacial debonding, and friction along crack faces are quantified as functions of time and overall deformation. The materials analyzed have HMX volume fractions between 0.69 and 0.82. Calculations show that variation in strain rate can significantly affect the spatial distribution but not the overall number of hot spots. Higher confining stresses lead to more intense heating in the binder and more uniform distribution of hot spots. The evolution of hot spots is quantified as a function of loading condition, deformation and microstructural attributes. The microstructure-response relations obtained can be used to assess the initiation sensitivity of energetic composites. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3688350]