Multidimensional fully-coupled thermal/chemical/mechanical response of reactive materials

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Description

A summary of multidimensional modeling is presented which describes coupled thermals chemical and mechanical response of reactive and nonreactive materials. This modeling addresses cookoff of energetic material (EM) prior to the onset of ignition. Cookoff, lasting from seconds to days, sensitizes the EM whereupon combustion of confined, degraded material determines the level of violence. Such processes are dynamic, occurring over time scales of millisecond to microsecond, and thus more amenable for shock physics analysis. This work provides preignition state estimates such as the amount of decomposition, morphological changes, and quasistatic stress states for subsequent dynamic analysis. To demonstrate a fully-coupled ... continued below

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10 p.

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Hobbs, M.L. & Baer, M.R. November 1, 1995.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

A summary of multidimensional modeling is presented which describes coupled thermals chemical and mechanical response of reactive and nonreactive materials. This modeling addresses cookoff of energetic material (EM) prior to the onset of ignition. Cookoff, lasting from seconds to days, sensitizes the EM whereupon combustion of confined, degraded material determines the level of violence. Such processes are dynamic, occurring over time scales of millisecond to microsecond, and thus more amenable for shock physics analysis. This work provides preignition state estimates such as the amount of decomposition, morphological changes, and quasistatic stress states for subsequent dynamic analysis. To demonstrate a fully-coupled thermal/chemical/quasistatic mechanical capability, several example simulations have been performed: (1) the one-dimensional time-to-explosion experiments, (2) the Naval Air Weapon Center`s (NAWC) small scale cookoff bomb, (3) a small hot cell experiment and (4) a rigid, highly porous, closed-cell polyurethane foam. Predictions compared adequately to available data. Deficiencies in the model and future directions are discussed.

Physical Description

10 p.

Notes

OSTI as DE96001935

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  • Joint Army Navy NASA Air Force propulsion systems hazards subcommittee meeting, Huntsville, AL (United States), 23-27 Oct 1995

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  • Other: DE96001935
  • Report No.: SAND--95-2337C
  • Report No.: CONF-9510228--1
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 123228
  • Archival Resource Key: ark:/67531/metadc627665

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  • November 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • April 14, 2016, 5:52 p.m.

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Hobbs, M.L. & Baer, M.R. Multidimensional fully-coupled thermal/chemical/mechanical response of reactive materials, article, November 1, 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc627665/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.