Mesostructure dependent reactive burn modeling of porous solid explosives

Document Type

Conference Proceeding

Publication Date

1-1-2014

Abstract

A precursor to shock initiation of porous explosives involves the formation of reactive hot-spots at the pore scale by the lead compaction shock followed by their growth and interaction that results in vigorous burn. It remains largely unclear how the material’s mesostructure (i.e., the particle packing density, and size and shape distributions) affects ignition behind compaction shocks and subsequent growth to detonation. In this study, a simple reactive burn model is formulated for sustained planar shock loading of porous HMX that incorporates an ignition criterion based on the effective reactive hot-spot formation rate established by inert mesoscale modeling and simulation of uniaxial waves. The effective rate is related to bulk wave pressure through a power law. The burn model is implemented in a two-phase (explosive and product gas) non-equilibrium continuum theory to computationally examine how ignition and initiation vary with initial packing density and shock strength. Preliminary predictions for low density HMX indicate that the burn model reasonably estimates the time and distance to detonation over a wide range of input shock pressure using a single fitting parameter that depends on initial density. Ignition and growth dominated initiation regimes are identified and discussed.

Publication Source (Journal or Book title)

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference 2014

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