Atomistic simulation of detonation initiation by ultra-short impact

30th International Conference on Interaction of Intense Energy Fluxes with Matter

Murzov, S.A.^1,2 ; Zhakhovsky, V.V.^1

All-Russia Scientific Research Institute of Automatics, Luganskaya 9, Moscow

115304, Russia^1

Moscow Institute of Physics and Technology, Institutskiy Pereulok 9, Dolgoprudny, Moscow Region

141700, Russia^2

关键词: Atomistic simulations;    Classical molecular dynamics;    Detonation initiation;    Detonation waves;    Interatomic forces;    Pressure profiles;    Reactive empirical bond order potential;    Thin metal foil;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/653/1/012056/pdf
DOI  :  10.1088/1742-6596/653/1/012056

来源: IOP

【 摘 要 】

We present results of the classical molecular dynamics simulation of detonation initiation in simple AB model of a high explosive compressed by ultra-short shock wave (SW). The simplified reactive empirical bond order potential (REBO) defines interatomic forces in the AB model explosive made up of diatomic AB molecules. Simulation of ultra-short piston-driven compression of AB explosive with duration of picoseconds represents an indirect initiation via a thin metal foil irradiated by a femtosecond laser pulse. We studied transition of SW to a detonation wave (DW), including evolution of calculated pressure profile in a sample. A run distance to detonation of such AB explosive film, which is required for detonation initiation, was obtained. Variation of loading time and piston velocity gives a 2D region of transition from SW to DW. The influence of pores on detonation initiation threshold is discussed.