Pore collapse and hot spots in HMX

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The computing power now available has led researchers to reconsider mesoscale simulations as a means to develop a detailed understanding of detonation waves in a heterogeneous explosive. Since chemical reaction rates are sensitive to temperature, hot spots are of critical importance for initiation. In a plastic-bonded explosive, shock desensitization experiments imply that hot spots generated by pore collapse dominate shock initiation. Here, for the collapse of a single pore driven by a shock, the dependence of the temperature distribution on numerical resolution and dissipative mechanism i s investigated. An inert material (with the constibtive properties of HMX) is used to ... continued below

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4 p.

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Menikoff, Ralph January 1, 2003.

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Description

The computing power now available has led researchers to reconsider mesoscale simulations as a means to develop a detailed understanding of detonation waves in a heterogeneous explosive. Since chemical reaction rates are sensitive to temperature, hot spots are of critical importance for initiation. In a plastic-bonded explosive, shock desensitization experiments imply that hot spots generated by pore collapse dominate shock initiation. Here, for the collapse of a single pore driven by a shock, the dependence of the temperature distribution on numerical resolution and dissipative mechanism i s investigated. An inert material (with the constibtive properties of HMX) is used to better focus on the mechanics of pore collapse. ' h o important findings resulted from this study. Eust, too low a resolution can significantly enhance the hot-spot mass. Second, at even moderate piston velocities (< 1W s),s hock dissipation alone does not generate sufficient hot-spot mass. ' b oo ther dissipative mechanism investigated are plastic work and viscous heating. In the cases studied, the integrated lempera!xre distribution has a power-law tail with exponent related to a parameter with dimensions of viscosity. For a particular case, the parameter of either dissipative mechanism can be fit to obtain quantitatively the hot-spot mass needed for initiation. But the dissipative mechanisms scale differently with shock strength and pore size. Consequently, to predict initiation behavior over a range of stimuli and as the micro-stmcture properties of a PBX am varied, sufficient numerical resolution and the correct physical dissipative mechanism are essential.

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4 p.

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  • Submitted to: APS Topical Conference, Shock Compression of Condensed Matter, Portland, OR, July 20-25, 2003

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  • Report No.: LA-UR-03-3113
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 976649
  • Archival Resource Key: ark:/67531/metadc931055

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  • January 1, 2003

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 6:53 p.m.

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Menikoff, Ralph. Pore collapse and hot spots in HMX, article, January 1, 2003; United States. (digital.library.unt.edu/ark:/67531/metadc931055/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.