Multiple-shock initiation via statistical crack mechanics

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Description

Statistical Crack Mechanics (SCRAM) is a theoretical approach to the behavior of brittle materials that accounts for the behavior of an ensemble of microcracks, including their opening, shear, growth, and coalescence. Mechanical parameters are based on measured strain-softening behavior. In applications to explosive and propellant sensitivity it is assumed that closed cracks act as hot spots, and that the heating due to interfacial friction initiates reactions which are modeled as one-dimensional heat flow with an Arrhenius source term, and computed in a subscale grid. Post-ignition behavior of hot spots is treated with the burn model of Ward, Son and Brewster. ... continued below

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7 p.

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Dienes, J. K. & Kershner, J. D. December 1998.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 41 times . More information about this report can be viewed below.

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Description

Statistical Crack Mechanics (SCRAM) is a theoretical approach to the behavior of brittle materials that accounts for the behavior of an ensemble of microcracks, including their opening, shear, growth, and coalescence. Mechanical parameters are based on measured strain-softening behavior. In applications to explosive and propellant sensitivity it is assumed that closed cracks act as hot spots, and that the heating due to interfacial friction initiates reactions which are modeled as one-dimensional heat flow with an Arrhenius source term, and computed in a subscale grid. Post-ignition behavior of hot spots is treated with the burn model of Ward, Son and Brewster. Numerical calculations using SCRAM-HYDROX are compared with the multiple-shock experiments of Mulford et al. in which the particle velocity in PBX 9501 is measured with embedded wires, and reactions are initiated and quenched.

Physical Description

7 p.

Notes

OSTI as DE99001772

Source

  • 11. detonation symposium, Snowmass, CO (United States), 31 Aug - 4 Sep 1998

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  • Other: DE99001772
  • Report No.: LA-UR--98-3046
  • Report No.: CONF-980803--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/329540 | External Link
  • Office of Scientific & Technical Information Report Number: 329540
  • Archival Resource Key: ark:/67531/metadc679906

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  • December 1998

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 24, 2015, 4:52 p.m.

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Dienes, J. K. & Kershner, J. D. Multiple-shock initiation via statistical crack mechanics, report, December 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc679906/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.