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Detonation in Shocked Homogeneous High Explosives

Published online by Cambridge University Press:  10 February 2011

C. S. Yoo ,
N. C. Holmes  and
P. C. Souers
C. S. Yoo
Affiliation:
Lawrence Livermore National Laboratory, University of California, Livermore, CA 94551, yool@llnl.gov
N. C. Holmes
Affiliation:
Lawrence Livermore National Laboratory, University of California, Livermore, CA 94551, yool@llnl.gov
P. C. Souers
Affiliation:
Lawrence Livermore National Laboratory, University of California, Livermore, CA 94551, yool@llnl.gov
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Abstract

We have studied shock-induced changes in homogeneous high explosives including nitromethane, tetranitromethane, and single crystals of pentaerythritol tetranitrate (PETN) by using fast time-resolved emission and Raman spectroscopy at a two-stage light-gas gun. The results reveal three distinct steps during which the homogeneous explosives chemically evolve to final detonation products. These are i) the initiation of shock compressed high explosives after an induction period, ii) thermal explosion of shock-compressed and/or reacting materials, and iii) a decay to a steady-state representing a transition to the detonation of uncompressed high explosives. Based on a gray-body approximation, we have obtained the CJ temperatures: 3800 K for nitromethane, 2950 K for tetranitromethane, and 4100 K for PETN. We compare the data with various thermochemical equilibrium calculations. In this paper we will also show a preliminary result of single-shot time-resolved Raman spectroscopy applied to shock-compressed nitromethane.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 418: Symposium GG – Decomposition, Combustion, and Detonation Chemistry of Energetic Materials , 1995 , 397
Copyright
Copyright © Materials Research Society 1996

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