Shock-induced energy localization and reaction growth considering chemical-inclusions effects for crystalline explosives

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外文摘要：Chemical inclusions significantly alter shock responses of crystalline explosives in macroscale gap ex-periments but their microscale dynamics origin remains unclear.Herein shock-induced energy locali-zation,overall physical responses,and reactions in α-1,3,5-trinitro-1,3,5-triazinane(α-RDX)crystal entrained various chemical inclusions were investigated by the multi-scale shock technique imple-mented in the reactive molecular dynamics method.Results indicated that energy localization and shock reaction were affected by the intrinsic factors within chemical inclusions,i.e.,phase states,chemical compositions,and concentrations.The atomic origin of chemical-inclusions effects on energy localization is dependent on the dynamics mechanism of interfacial molecules with free space volume,which in-cludes homogeneous intermolecular compression,interfacial impact and shear,and void collapse and jet.As introducing various chemical inclusions,the initiation of those dynamics mechanisms triggers diverse decay rates of bulk RDX molecules and hereby impacts on growth speeds of final reactions.Adding chemical inclusions can reduce the effectiveness of the void during the shock impacting.Under the shockwave velocity of 9 km/s,the parent RDX decay rate in RDX entrained amorphous carbon decreases the most and is about one fourth of that in RDX with a vacuum void,and solid HMX and TATB inclusions are more reactive than amorphous carbon but less reactive than dry air or acetone inclusions.The less-dense shocking system denotes the greater increases in local temperature and stress,the faster energy liberation,and the earlier final reaction into equilibrium,revealing more pronounced responses to the present intense shockwave.The quantitative models associated with the relative system density(RDsys)were proposed for indicating energy-localization mechanisms and evaluating initiation safety in the shocked crystalline explosive.RDsys is defined by the density ratio of defective RDX to perfect crystal after dynamics relaxation and reveals the global density characteristic in shocked systems filled with chemical inclusions.When RDsys is below 0.9,local hydrodynamic jet initiated by void collapse dominates upon energy localization instead of interfacial impact.This study sheds light on novel insights for under-standing the shock chemistry and physical-based atomic origin in crystalline explosives considering chemical-inclusions effects.

外文关键词：

Shock responsesEnergy localizationCrystalline explosivesChemical inclusionsReactive molecular dynamics

作者：

Ruqin Liu、Yanqing Wu、Xinjie Wang、Fenglei Huang、Xiaona Huang、Yushi Wen

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作者单位：

State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing,100081,China

School of Power and Mechanical Engineering,Wuhan University,Wuhan,430072,Hubei,China

Institute of Chemical Materials,China Academy of Engineering Physics(CAEP),Mianyang,621999,Sichuan,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Hubei Province

项目编号：

1187211912172051119723292021CFB120

出版年：

2024

DOI：

10.1016/j.dt.2023.02.011

防务技术

中国兵工学会

防务技术

CSTPCD

影响因子：0.358

ISSN：2214-9147

年,卷(期)：2024.33(3)

参考文献量88