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Title: A physically-based Mie–Gruneisen equation of state to determine hot spot temperature distributions

Abstract

Here, a physically-based form of the Mie–Grüneisen equation of state (EOS) is derived for calculating 1d planar shock temperatures, as well as hot spot temperature distributions from heterogeneous impact simulations. This form utilises a multi-term Einstein oscillator model for specific heat, and is completely algebraic in terms of temperature, volume, an integrating factor, and the cold curve energy. Moreover, any empirical relation for the reference pressure and energy may be substituted into the equations via the use of a generalised reference function. The complete EOS is then applied to calculations of the Hugoniot temperature and simulation of hydrodynamic pore collapse using data for the secondary explosive, hexanitrostilbene (HNS). From these results, it is shown that the choice of EOS is even more significant for determining hot spot temperature distributions than planar shock states. The complete EOS is also compared to an alternative derivation assuming that specific heat is a function of temperature alone, i.e. cv(T). Temperature discrepancies on the order of 100–600 K were observed corresponding to the shock pressures required to initiate HNS (near 10 GPa). Overall, the results of this work will improve confidence in temperature predictions. By adopting this EOS, future work may be able to assignmore » physical meaning to other thermally sensitive constitutive model parameters necessary to predict the shock initiation and detonation of heterogeneous explosives.« less

Authors:
 [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1371468
Report Number(s):
SAND-2015-7099J
Journal ID: ISSN 1364-7830; 655037
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Combustion Theory and Modelling
Additional Journal Information:
Journal Volume: 20; Journal Issue: 5; Journal ID: ISSN 1364-7830
Publisher:
Taylor & Francis
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Mie–Gruneisen equation of state; shock Hugoniot; explosive modelling; hydrocode; heterogeneous impact

Citation Formats

Kittell, David Erik, and Yarrington, Cole Davis. A physically-based Mie–Gruneisen equation of state to determine hot spot temperature distributions. United States: N. p., 2016. Web. doi:10.1080/13647830.2016.1201145.
Kittell, David Erik, & Yarrington, Cole Davis. A physically-based Mie–Gruneisen equation of state to determine hot spot temperature distributions. United States. doi:https://doi.org/10.1080/13647830.2016.1201145
Kittell, David Erik, and Yarrington, Cole Davis. Thu . "A physically-based Mie–Gruneisen equation of state to determine hot spot temperature distributions". United States. doi:https://doi.org/10.1080/13647830.2016.1201145. https://www.osti.gov/servlets/purl/1371468.
@article{osti_1371468,
title = {A physically-based Mie–Gruneisen equation of state to determine hot spot temperature distributions},
author = {Kittell, David Erik and Yarrington, Cole Davis},
abstractNote = {Here, a physically-based form of the Mie–Grüneisen equation of state (EOS) is derived for calculating 1d planar shock temperatures, as well as hot spot temperature distributions from heterogeneous impact simulations. This form utilises a multi-term Einstein oscillator model for specific heat, and is completely algebraic in terms of temperature, volume, an integrating factor, and the cold curve energy. Moreover, any empirical relation for the reference pressure and energy may be substituted into the equations via the use of a generalised reference function. The complete EOS is then applied to calculations of the Hugoniot temperature and simulation of hydrodynamic pore collapse using data for the secondary explosive, hexanitrostilbene (HNS). From these results, it is shown that the choice of EOS is even more significant for determining hot spot temperature distributions than planar shock states. The complete EOS is also compared to an alternative derivation assuming that specific heat is a function of temperature alone, i.e. cv(T). Temperature discrepancies on the order of 100–600 K were observed corresponding to the shock pressures required to initiate HNS (near 10 GPa). Overall, the results of this work will improve confidence in temperature predictions. By adopting this EOS, future work may be able to assign physical meaning to other thermally sensitive constitutive model parameters necessary to predict the shock initiation and detonation of heterogeneous explosives.},
doi = {10.1080/13647830.2016.1201145},
journal = {Combustion Theory and Modelling},
number = 5,
volume = 20,
place = {United States},
year = {2016},
month = {7}
}

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