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High pressure Hugoniot measurements using converging shocks

Brown, J. L. and Ravichandran, G. and Reinhart, W. D. and Trott, W. M. (2011) High pressure Hugoniot measurements using converging shocks. Journal of Applied Physics, 109 (9). Art. No. 093520. ISSN 0021-8979.

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Plate impact experiments are a powerful tool in equation of state development, but are inherently limited by the range of impact velocities accessible to the facility. In an effort to dramatically increase the range of pressures which can be studied with available impact velocities, a new experimental technique is examined. The target plate is replaced by a composite assembly consisting of two concentric cylinders. The target is designed such that the initial shock velocity in a well-characterized outer cylinder is higher than in the inner cylinder material of interest. Conically converging shocks will be generated at the interface due to the impedance mismatch between the two materials and axisymmetric geometry. Upon convergence, an irregular reflection occurs and the conical analog of a Mach reflection develops. This Mach reflection grows until it reaches a steady state, at which point the high pressure state in the Mach disk can be measured using velocity interferometry and impedance matching techniques. The technique is demonstrated by studying the shock response of copper. A strong confinement setup utilizes a low impedance 6061-T6 aluminum outer cylinder and the weak confinement case features a higher impedance molybdenum outer cylinder. The experimental results for copper are in good agreement with a simple analytical model, numerical simulations, and data in the literature. The possibility of utilizing full field measurements to make multiple Hugoniot measurements is also examined.

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Ravichandran, G.0000-0002-2912-0001
Additional Information:© 2011 American Institute of Physics. Received 22 February 2011; accepted 11 April 2011; published online 12 May 2011. The research support provided by the Caltech Center for the Predictive Modeling and Simulation of High-Energy Density Dynamic Response of Materials through the U.S. Department of Energy, Contract No. DE-FC52-08NA28613, is gratefully acknowledged. We would also like to acknowledge Tom Thornhill, John Martinez, and Rocky Palomino from Sandia National Laboratories for their technical support in conducting the experiments done at the STAR facility. We thank Professor Hans Hornung for helpful discussions regarding the shock polar analysis, Dr. Dennis Grady for helpful discussions, and Dr. Lalit Chhabildas for his suggestions on shaping the Mach wave.
Funding AgencyGrant Number
Department of Energy (DOE) National Nuclear Security AdministrationDE-FC52-08NA28613
Subject Keywords:acoustic wave velocity, copper, equations of state, impact (mechanical), shock waves
Issue or Number:9
Classification Code:PACS: 64.30.Ef; 62.50.Ef
Record Number:CaltechAUTHORS:20110603-095723886
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23896
Deposited By: Tony Diaz
Deposited On:17 Jun 2011 16:41
Last Modified:22 May 2020 21:05

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