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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.142 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.640
pages 606-621

MODEL FORMULATION OF LASER INITIATION OF EXPLOSIVES CONTAINED IN A SHELL

Eric Boyer
The Pennsylvania State University, University Park, Pennsylvania 16802, USA

RÉSUMÉ

Laser initiation can provide a safe and effective way to remotely destroy unexploded ordnance. In order to better understand the processes taking place and to provide a predictive capability, a comprehensive theoretical model has been formulated for simulating the physical and chemical processes associated with the laser initiation of explosives contained in a shell. The formulation is based upon various experimental observations and physical principles. Many complex processes are taking place, due to interactions of the laser beam, metal shell, and explosive core. Each of the important processes was examined in detail as a submodel; the combination of these submodels formed a complete description of laser drilling and initiation. The overall formulation considers the following major processes: 1) laser heating of the metal shell casing, 2) melt layer formation and expulsion of molten material from the heated zone due to the recoil pressure force generated from metal vaporization, 3) bubble formation and bursting in the melt layer, 4) ejection of liquid droplets from the rupturing bubbles, 5) in-depth heat transfer to the metal and solid explosives, 6) formation of a high-velocity plume jet of metal vapor, 7) turbulence interaction and chemical reaction between the plume jet and ambient air, 8) liquid- and gas-phase chemical reactions of the RDX explosive in producing fragmented chemical species, and 9) runaway ignition of RDX explosive caused by laser energy input and chemical reactions between the decomposed species of RDX. Wherever possible, experimental data have been incorporated. The model presented here provides the most detailed and complete formulation available for this topic.


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