The evolution of microstructural changes in pressed HMX explosives

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Description

Recently developed techniques for investigating the microstructure of plastic-bonded explosives have been applied to HMX explosives pressed to various levels of porosity. Microstructural changes in PBX 9501 area followed from the early stages of prill consolidation through typical density to very low porosity (0.6%). As porosity is reduced, the following sequence is observed. Large inter- and intra-prill voids are eliminated with first damage to HMX crystals occurring at prill boundaries. This is followed by increased incidence of crystal twinning and cracking. At the lowest porosities, spall pullout artifacts are observed, cracks associated with particle contact points are more obvious, and ... continued below

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9 p.

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Skidmore, C.B.; Phillips, D.S.; Howe, P.M.; Mang, J.T. & Romero, J.A. December 31, 1998.

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Description

Recently developed techniques for investigating the microstructure of plastic-bonded explosives have been applied to HMX explosives pressed to various levels of porosity. Microstructural changes in PBX 9501 area followed from the early stages of prill consolidation through typical density to very low porosity (0.6%). As porosity is reduced, the following sequence is observed. Large inter- and intra-prill voids are eliminated with first damage to HMX crystals occurring at prill boundaries. This is followed by increased incidence of crystal twinning and cracking. At the lowest porosities, spall pullout artifacts are observed, cracks associated with particle contact points are more obvious, and the results of intercrystalline indentation or intergrowth migration processes are apparent. A comparison is made, at lowest porosities achieved, with PX 9404 and X-0242 (a formulation like PBX 9501 with higher binder volume). Possible implications on porosity trends in shock sensitivity data are discussed.

Physical Description

9 p.

Notes

OSTI as DE99002405

Source

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

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  • Other: DE99002405
  • Report No.: LA-UR--98-3473
  • Report No.: CONF-980803--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/334323 | External Link
  • Office of Scientific & Technical Information Report Number: 334323
  • Archival Resource Key: ark:/67531/metadc675924

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Office of Scientific & Technical Information Technical Reports

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

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  • December 31, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 25, 2016, 4:29 p.m.

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Skidmore, C.B.; Phillips, D.S.; Howe, P.M.; Mang, J.T. & Romero, J.A. The evolution of microstructural changes in pressed HMX explosives, report, December 31, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc675924/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.