Initiation Pressure Thresholds from Three Sources

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Pressure thresholds are minimum pressures needed to start explosive initiation that ends in detonation. We obtain pressure thresholds from three sources. Run-to-detonation times are the poorest source but the fitting of a function gives rough results. Flyer-induced initiation gives the best results because the initial conditions are the best known. However, very thick flyers are needed to give the lowest, asymptotic pressure thresholds used in modern models and this kind of data is rarely available. Gap test data is in much larger supply but the various test sizes and materials are confusing. We find that explosive pressures are almost the ... continued below

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Souers, P. C. & Vitello, P. February 28, 2007.

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Pressure thresholds are minimum pressures needed to start explosive initiation that ends in detonation. We obtain pressure thresholds from three sources. Run-to-detonation times are the poorest source but the fitting of a function gives rough results. Flyer-induced initiation gives the best results because the initial conditions are the best known. However, very thick flyers are needed to give the lowest, asymptotic pressure thresholds used in modern models and this kind of data is rarely available. Gap test data is in much larger supply but the various test sizes and materials are confusing. We find that explosive pressures are almost the same if the distance in the gap test spacers are in units of donor explosive radius. Calculated half-width time pulses in the spacers may be used to create a pressure-time curve similar to that of the flyers. The very-large Eglin gap tests give asymptotic thresholds comparable to extrapolated flyer results. The three sources are assembled into a much-expanded set of near-asymptotic pressure thresholds. These thresholds vary greatly with density: for TATB/LX-17/PBX 9502, we find values of 4.9 and 8.7 GPa at 1.80 and 1.90 g/cm{sup 3}, respectively.

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PDF-file: 20 pages; size: 0.2 Mbytes

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  • Journal Name: Propellants, Explosives, Pyrotechnics, vol. 32, no. 4, June 1, 2007, pp. 288-295; Journal Volume: 32; Journal Issue: 4

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  • Report No.: UCRL-JRNL-228623
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 972828
  • Archival Resource Key: ark:/67531/metadc925683

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • February 28, 2007

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 5, 2016, 9:21 p.m.

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Souers, P. C. & Vitello, P. Initiation Pressure Thresholds from Three Sources, article, February 28, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc925683/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.