Detonation waves in trinitrotoluene |
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Authors: | John W Kury R Don Breithaupt Craig M Tarver |
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Institution: | (1) Lawrence Livermore National Laboratory, Livermore, CA 94550, USA , US |
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Abstract: | Fabry-Perot, ORVIS, and VISAR laser interferometry are used to obtain nanosecond time resolved particle velocity histories
of the free surfaces of copper and tantalum discs accelerated by detonating trinitrotoluene (TNT) charges and of the interfaces
between TNT detonation products and lithium fluoride crystals. TNT detonation reaction zone profiles are measured for self-sustaining
detonation and piston supported overdriven (supracompressed) waves. The experimental records are compared to particle velocity
histories calculated using very finely zoned meshes of the exact dimensions with the DYNA2D hydrodynamic code. The Ignition
and Growth reactive flow model, which is based on the Zeldovich-von Neumann-D?ring (ZND) theory of detonation, yields excellent
agreement with the experimental records for TNT using an unreacted von Neumann spike pressure of 25 GPa, a reaction rate law
which releases 90% of the chemical energy within 80 ns and the remaining 10% over an additional 200 ns, and a reaction product
equation of state fit to cylinder test data assuming a Chapman-Jouguet pressure of 19 GPa. The late time energy release is
attributed to diffusion controlled solid carbon particle formation.
Received 26 July 1997 / Accepted 29 December 1997 |
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Keywords: | :Detonation Reaction Zone Trinitrotoluene Modeling Laser Interferometry |
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