Multidimensional DDT modeling of energetic materials

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Description

To model the shock-induced behavior of porous or damaged energetic materials, a nonequilibrium mixture theory has been developed and incorporated into the shock physics code, CTH. The foundation for this multiphase model is based on a continuum mixture formulation given by Baer and Nunziato. This multiphase mixture model provides a thermodynamic and mathematically-consistent description of the self-accelerated combustion processes associated with deflagration-to-detonation and delayed detonation behavior which are key modeling issues in safety assessment of energetic systems. An operator-splitting method is used in the implementation of this model, whereby phase diffusion effects are incorporated using a high resolution transport method. ... continued below

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20 p.

Creation Information

Baer, M.R.; Hertel, E.S. & Bell, R.L. July 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

To model the shock-induced behavior of porous or damaged energetic materials, a nonequilibrium mixture theory has been developed and incorporated into the shock physics code, CTH. The foundation for this multiphase model is based on a continuum mixture formulation given by Baer and Nunziato. This multiphase mixture model provides a thermodynamic and mathematically-consistent description of the self-accelerated combustion processes associated with deflagration-to-detonation and delayed detonation behavior which are key modeling issues in safety assessment of energetic systems. An operator-splitting method is used in the implementation of this model, whereby phase diffusion effects are incorporated using a high resolution transport method. Internal state variables, forming the basis for phase interaction quantities, are resolved during the Lagrangian step requiring the use of a stiff matrix-free solver. Benchmark calculations are presented which simulate low-velocity piston impact on a propellant porous bed and experimentally-measured wave features are well replicated with this model. This mixture model introduces micromechanical models for the initiation and growth of reactive multicomponent flow that are key features to describe shock initiation and self-accelerated deflagration-to-detonation combustion behavior. To complement one-dimensional simulation, two-dimensional numerical calculations are presented which indicate wave curvature effects due to the loss of wall confinement. This study is pertinent for safety analysis of weapon systems.

Physical Description

20 p.

Notes

OSTI as DE95015242

Source

  • 26. international Institute fur Chemische Technologies (ICT) conference, Karlsruhe (Germany), 4-7 Jul 1995

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  • Other: DE95015242
  • Report No.: SAND--95-0037C
  • Report No.: CONF-9507144--2
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/102194 | External Link
  • Office of Scientific & Technical Information Report Number: 102194
  • Archival Resource Key: ark:/67531/metadc626542

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  • July 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 14, 2016, 5:51 p.m.

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Baer, M.R.; Hertel, E.S. & Bell, R.L. Multidimensional DDT modeling of energetic materials, report, July 1, 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc626542/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.