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Direct numerical simulation of shear localization and decomposition reactions in shock-loaded HMX crystal [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers 185,902 : digital, PDF file
Additional Creators
Lawrence Livermore National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
A numerical model is developed to study the shock wave ignition of HMX crystal. The model accounts for the coupling between crystal thermal/mechanical responses and chemical reactions that are driven by the temperature field. This allows for the direct numerical simulation of decomposition reactions in the hot spots formed by shock/impact loading. The model is used to simulate intragranular pore collapse under shock wave loading. In a reference case: (i) shear-enabled micro-jetting is responsible for a modest extent of reaction in the pore collapse region, and (ii) shear banding is found to be an important mode of localization. The shear bands, which are filled with molten HMX, grow out of the pore collapse region and serve as potential ignition sites. The model predictions of shear banding and reactivity are found to be quite sensitive to the respective flow strengths of the solid and liquid phases. In this regard, it is shown that reasonable assumptions of liquid-HMX viscosity can lead to chemical reactions within the shear bands on a nanosecond time scale.
Report Numbers
E 1.99:llnl-jrnl--664305
llnl-jrnl--664305
Subject(s)
Note
Published through SciTech Connect.
05/14/2015.
"llnl-jrnl--664305"
Journal of Applied Physics 117 18 ISSN 0021-8979; JAPIAU AM
Ryan A. Austin; Nathan R. Barton; John E. Reaugh; Laurence E. Fried.
Funding Information
AC52-07NA27344
View MARC record | catkey: 23759214