Simulating thermal explosion of RDX-based explosives: Model comparison with experiment

Yoh, J J; McClelland, M A; Maienschein, J L; Wardell, J F; Tarver, C M

Title: Simulating thermal explosion of RDX-based explosives: Model comparison with experiment

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Abstract

We compare two-dimensional model results with measurements for the thermal, chemical and mechanical behavior in a thermal explosion experiment. Confined high explosives are heated at a rate of 1 C per hour until an explosion is observed. The heating, ignition, and deflagration phases are modeled using an Arbitrarily Lagrangian-Eulerian code (ALE3D) that can handle a wide range of time scales that vary from a structural to a dynamic hydro time scale. During the pre-ignition phase, quasi-static mechanics and diffusive thermal transfer from a heat source to the HE are coupled with the finite chemical reactions that include both endothermic and exothermic processes. Once the HE ignites, a hydro dynamic calculation is performed as a burn front propagates through the HE. Two RDX-based explosives, C-4 and PBXN-109, are considered, whose chemical-thermal-mechanical models are constructed based on measurements of thermal and mechanical properties along with small scale thermal explosion measurements. The simulated dynamic response of HE confinement during the explosive phase is compared to measurements in large scale thermal explosion tests. The explosion temperatures for both HE's are predicted to within 5 C. Calculated and measured wall strains provide an indication of vessel pressurization during the heating phase and violence during themore »« less

Authors:: Yoh, J J; McClelland, M A; Maienschein, J L; Wardell, J F; Tarver, C M

Publication Date:: Mon Oct 11 00:00:00 EDT 2004

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 15020078

Report Number(s):: UCRL-JRNL-207203
Journal ID: ISSN 0021-8979; JAPIAU; TRN: US200519%%162

DOE Contract Number:: W-7405-ENG-48

Resource Type:: Journal Article

Journal Name:: Journal of Applied Physics

Additional Journal Information:: Journal Volume: 97; Journal Issue: 8; Journal ID: ISSN 0021-8979

Country of Publication:: United States

Language:: English

Subject:: 29 ENERGY PLANNING, POLICY AND ECONOMY; 33 ADVANCED PROPULSION SYSTEMS; 36 MATERIALS SCIENCE; 42 ENGINEERING; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; ACCURACY; CHEMICAL EXPLOSIVES; CHEMICAL REACTIONS; CONFINEMENT; DATA; EXPLOSIONS; EXPLOSIVES; HEAT SOURCES; HEATING; IGNITION; MECHANICAL PROPERTIES; PRESSURIZATION; STRAINS

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                    Yoh, J J, McClelland, M A, Maienschein, J L, Wardell, J F, and Tarver, C M. Simulating thermal explosion of RDX-based explosives: Model comparison with experiment.  United States: N. p., 2004. 
        Web.

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                    Yoh, J J, McClelland, M A, Maienschein, J L, Wardell, J F, & Tarver, C M. Simulating thermal explosion of RDX-based explosives: Model comparison with experiment.  United States.

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                    Yoh, J J, McClelland, M A, Maienschein, J L, Wardell, J F, and Tarver, C M. 2004.  
        "Simulating thermal explosion of RDX-based explosives: Model comparison with experiment".  United States.  https://www.osti.gov/servlets/purl/15020078.

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@article{osti_15020078,

  title        = {Simulating thermal explosion of RDX-based explosives: Model comparison with experiment},

  author       = {Yoh, J J and McClelland, M A and Maienschein, J L and Wardell, J F and Tarver, C M},

  abstractNote = {We compare two-dimensional model results with measurements for the thermal, chemical and mechanical behavior in a thermal explosion experiment. Confined high explosives are heated at a rate of 1 C per hour until an explosion is observed. The heating, ignition, and deflagration phases are modeled using an Arbitrarily Lagrangian-Eulerian code (ALE3D) that can handle a wide range of time scales that vary from a structural to a dynamic hydro time scale. During the pre-ignition phase, quasi-static mechanics and diffusive thermal transfer from a heat source to the HE are coupled with the finite chemical reactions that include both endothermic and exothermic processes. Once the HE ignites, a hydro dynamic calculation is performed as a burn front propagates through the HE. Two RDX-based explosives, C-4 and PBXN-109, are considered, whose chemical-thermal-mechanical models are constructed based on measurements of thermal and mechanical properties along with small scale thermal explosion measurements. The simulated dynamic response of HE confinement during the explosive phase is compared to measurements in large scale thermal explosion tests. The explosion temperatures for both HE's are predicted to within 5 C. Calculated and measured wall strains provide an indication of vessel pressurization during the heating phase and violence during the explosive phase. During the heating phase, simulated wall strains provide only an approximate representation of measured values indicating a better numerical treatment is needed to provide accurate results. The results also show that more numerical accuracy is needed for vessels with lesser confinement strength. For PBXN-109, the measured wall strains during the explosion are well represented by the ALE3D calculations.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/15020078},
  journal      = {Journal of Applied Physics},

  issn         = {0021-8979},

  number       = 8,

  volume       = 97,

  place        = {United States},

  year         = {Mon Oct 11 00:00:00 EDT 2004},

  month        = {Mon Oct 11 00:00:00 EDT 2004}

}

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