Mechanical ignition of combustion in condensed phase high explosives

Foster, Joseph C.; Christopher, Frank; Wilson, L. L.; Osborn, J. R.

doi:10.1063/1.55695

Cited by 1 publication

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“…The approach is similar to the modified Prank-Kamenetskii thermal explosion theory of Foster, et al [6]. To this end, we track the time-dependent, radial evolution of thermal energy and chemical reaction progress of HMX contained within a single localization sphere subject to thermal energy deposition based on the strategy of Subsection 3.2.2.…”

Section: Meso-scale Responsementioning

confidence: 99%

Modeling and analysis of reactive compaction for granular energetic solids

Gonthier

2003

Combustion Science and Technology

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. A technique is described for modeling mechanically induced localized heating and ignition at the grain scale (meso-scale) of granular reactive solids that maintains proper consistency with the experimentally characterized bulk (macro-scale) material behavior. The technique is illustrated for the dynamic compaction, localized heating, and ignition of granular HMX due to mild impact of a constant speed piston (-86 m/s). Guided by basic principles of contact mechanics, bulk dissipated mechanical energy is thermalized at localization sites (hot-spots) within the material meso-structure which are centered at intergranular contact points (surfaces). The evolution of bulk quantities is tracked at the macro-scale and the evolution of hot-spot temperature, mass fraction, and reaction progress are tracked at the meso-scale. Model predictions indicate that the onset of sustained combustion occurs for a piston speed that agrees well with confined Deflagration-toDetonation Transition (DDT) experiments. This result suggests that the coupling technique may provide a rational framework for the development of improved energy localization, and ignition models for heterogeneous reactive solids.Results of a parametric sensitivity analysis show that the model is reasonably insensitive to variation in key energy localization parameters.14. SUBJECT TERM Mechanical ignition; reactive flow; shock wave; equation of state; detonation velocity; grain size distribution 15.

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Section: Meso-scale Responsementioning

confidence: 99%

Modeling and analysis of reactive compaction for granular energetic solids

Gonthier

2003

Combustion Science and Technology

View full text Add to dashboard Cite

show abstract

Mechanical ignition of combustion in condensed phase high explosives

Cited by 1 publication

References 2 publications

Modeling and analysis of reactive compaction for granular energetic solids

Modeling and analysis of reactive compaction for granular energetic solids

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