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High Pressure Hugoniot Measurements Using Converging Shocks

Brown, J. L. and Ravichandran, G. (2011) High Pressure Hugoniot Measurements Using Converging Shocks. In: Dynamic Behavior of Materials. Conference Proceedings of the Society for Experimental Mechanics Series. Vol.1. Springer , New York, NY, pp. 403-409. ISBN 978-1-4419-8227-8.

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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 gun. In an effort to dramatically increase the range of pressures which can be studied with available impact velocities, a new experimental technique is being developed. The possibility of using converging shock waves to produce a high pressure Mach reflection is examined. The technique proposed uses a composite target simply consisting of two concentric cylinders, with the only requirement being the initial shock speed in the outer cylinder is greater than that in the inner cylinder. Conically converging shocks will be generated at the interface due to the impedance mismatch and axisymmetric geometry of the composite target. Upon convergence, an irregular reflection must occur, at which point the conical analog of a Mach reflection develops. Once the Mach reflection reaches a steady state, the high pressure state in the Mach disk can be measured using velocity interferometry and impedance matching techniques. Experimental results on a copper inner cylinder are in good agreement with numerical simulations and data in the literature.

Item Type:Book Section
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Ravichandran, G.0000-0002-2912-0001
Additional Information:© 2011 The Society for Experimental Mechanics, Inc. First Online: 25 January 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 DE-FC52-08NA28613 is gratefully acknowledged.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FC52-08NA28613
Subject Keywords:Shock Wave; Impact Velocity; Outer Cylinder; Mach Disk; Mach Reflection
Series Name:Conference Proceedings of the Society for Experimental Mechanics Series
Record Number:CaltechAUTHORS:20200522-140337858
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103427
Deposited By: Tony Diaz
Deposited On:22 May 2020 21:20
Last Modified:22 May 2020 21:20

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