Measuring explosive non-ideality

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The sonic reaction zone length may be measured by four methods: (1) size effect, (2) detonation front curvature, (3) crystal interface velocity and (4) in-situ gauges. The amount of data decreases exponentially from (1) to (4) with there being almost no gauge data for prompt detonation at steady state. The ease and clarity of obtaining the reaction zone length increases from (1) to (4). The method of getting the reaction zone length, <x{sub e}>, is described for the four methods. A measure of non-ideality is proposed: the reaction zone length divided by the cylinder radius. N = <x{sub e}>/R{sub o}. ... continued below

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803 Kilobytes pages

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Souers, P C February 17, 1999.

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Description

The sonic reaction zone length may be measured by four methods: (1) size effect, (2) detonation front curvature, (3) crystal interface velocity and (4) in-situ gauges. The amount of data decreases exponentially from (1) to (4) with there being almost no gauge data for prompt detonation at steady state. The ease and clarity of obtaining the reaction zone length increases from (1) to (4). The method of getting the reaction zone length, <x{sub e}>, is described for the four methods. A measure of non-ideality is proposed: the reaction zone length divided by the cylinder radius. N = <x{sub e}>/R{sub o}. N = 0 for true ideality. It also decreases with increasing radius as it should. For N < 0.10, an equilibrium EOS like the JWL may be used. For N > 0.10, a time-dependent description is essential. The crystal experiment, which measures the particle velocity of an explosive-transparent material interface, is presently rising in importance. We examine the data from three experiments and apply: (1) an impedance correction that transfers the explosive C-J particle velocity to the corresponding value for the interface, and (2) multiplies the interface time by 3/4 to simulate the explosive speed of sound. The result is a reaction zone length comparable to those obtained by other means. A few explosives have reaction zones so small that the change of slope in the particle velocity is easily seen.

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803 Kilobytes pages

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  • International Workshop on the Modeling of Non-ideal Explosives, Energetic Materials Research and Testing Center, New Mexico, Institute of Mining and Technology, Socorro, NM (US), 03/16/1999--03/18/1999

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  • Report No.: UCRL-JC-132499
  • Report No.: DP0102052
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 14705
  • Archival Resource Key: ark:/67531/metadc619122

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  • February 17, 1999

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  • June 16, 2015, 7:43 a.m.

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  • May 6, 2016, 4:01 p.m.

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Souers, P C. Measuring explosive non-ideality, article, February 17, 1999; California. (digital.library.unt.edu/ark:/67531/metadc619122/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.