Detonation in shocked homogeneous high explosives
- Lawrence Livermore National Lab., CA (United States)
The authors 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 (1) the initiation of shock compressed high explosives after an induction period, (2) thermal explosion of shock-compressed and/or reacting materials, and (3) a decay to a steady-state representing a transition to the detonation of uncompressed high explosives. Based on a gray-body approximation, the authors have obtained the CJ temperatures: 3,800 K for nitromethane, 2,950 K for tetranitromethane, and 4,100 K for PETN. They compare the data with various thermochemical equilibrium calculations. In this paper they will also show a preliminary result of single-shot time-resolved Raman spectroscopy applied to shock-compressed nitromethane.
- OSTI ID:
- 248266
- Report Number(s):
- CONF-951155--; ISBN 1-55899-321-5
- Country of Publication:
- United States
- Language:
- English
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