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Title: Reactive Processes in Energetic Materials.


Abstract not provided.

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Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the For display at SNL/CA Bldg 906.
Country of Publication:
United States

Citation Formats

Kay, Jeffrey J, Steill, Jeffrey D, Highley, Aaron M., and Wiese-Smith, Deneille. Reactive Processes in Energetic Materials.. United States: N. p., 2015. Web.
Kay, Jeffrey J, Steill, Jeffrey D, Highley, Aaron M., & Wiese-Smith, Deneille. Reactive Processes in Energetic Materials.. United States.
Kay, Jeffrey J, Steill, Jeffrey D, Highley, Aaron M., and Wiese-Smith, Deneille. 2015. "Reactive Processes in Energetic Materials.". United States. doi:.
title = {Reactive Processes in Energetic Materials.},
author = {Kay, Jeffrey J and Steill, Jeffrey D and Highley, Aaron M. and Wiese-Smith, Deneille},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2015,
month = 1

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  • Reactive thermal waves (RTWs) arise in several energetic material applications, including self-propagating high-temperature synthesis (SHS), high explosive cookoff, and the detonation of heterogeneous explosives. In this paper I exmaine ideal RTWs, by which I mean that (1) material motion is neglected, (2) the state dependence of reaction is Arrhenius in the temperature, and (3) the reaction rate is modulated by an arbitrary mass-fraction-based reaction progress function. Numerical simulations demonstrate that one's natural intuition, which is based mainly upon experience with inert materials and which leads one to expect diffusion processes to become relatively slow after a short time period, ismore » invalid for high energy, state-sensitive reactive systems. Instead, theory predicts that RTWs can propagate at very high speeds. This result agrees with estimates for detonating heterogeneous explosives, which indicate that RTWs must spread from hot-spot nucleation sites at rates comparable to the detonation speed in order to produce experimentally-observed reaction zone thicknesses. Using dimensionless scaling and further invoking the high activation energy approximation, I obtain an analytic formula for the steady plane RTW speed from numerical calculations. I then compute the RTW speed for real explosives, and discuss aspects of their behavior.« less
  • In this paper, we describe a reactive multiphase flow model for the initiation and compressive combustion of dynamically compacted granular energetic materials. Numerical solutions of the reactive multiphase flow equations are obtained for various cases of dynamic compaction. Constitutive relationships of this description are determined for the granular explosive HMX and for nitrocellulose- based ball propellants. At low impact velocities, loading produces compaction without subsequent reaction. Calculations of compaction wave speed and compaction density are in good agreement with experimental observations. Compaction-induced combustion is observed for conditions of higher impact loading. A global reaction model is formulated using experimental time-to-reactionmore » data and calculations of the initiation and combustion reveal detailed wave structures of the compaction and flame spread near the threshold to deflagration to detonation transition (DDT). Predictions of the reactive one-dimensional wave fields compare favorably to experimental observations. 17 refs., 10 figs., 1 tab.« less
  • Epitaxial and highly oriented thin films of Dy-Ba-Cu-O superconductor have been grown by thermal evaporation of Dy, Ba and Cu metals onto MgO and SrTiO{sub 3} substrates. Oxidation of the evaporated metal species is realized by releasing oxygen gas near the substrate during evaporation. The films deposited on (100)SrTiO{sub 3}, when annealed at 900 {degree}C, crystallize epitaxially with c-axis on the plane of the substrate. These films are metallic with superconducting transition width {approx}1.5 K. On magnesium oxide substrates, the film crystallize into a polycrystalline material which undergoes a strong c-axis reorientation upon further annealing at 950 {degree}C. Activated Reactivemore » Evaporation process has been successfully used for {ital in} {ital situ} growth of the superconducting phase on Al{sub 2}O{sub 3} substrates. These films reach a zero resistance state at 60 K.« less