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High pressure Hugoniot measurements using Mach waves

Brown, J. L. and Ravichandran, G. (2012) High pressure Hugoniot measurements using Mach waves. In: 2011 Shock Compression of Condensed Matter. AIP Conference Proceedings. No.1426. American Institute of Physics , Melville, NY, pp. 485-488. ISBN 978-0-7354-1006-0.

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Traditionally, most dynamic shock compression experiments are conducted using a plane one-dimensional wave of uniaxial strain. In this case, the evaluation of the equation of state is simplified due to the geometry, but the amplitude of the induced shock wave is limited by the magnitude of the input load. In an effort to dramatically increase the range of pressures that can be accessed by traditional loading methods, a composite target assembly is examined. The target consists of two concentric cylinders aligned with the axial direction parallel to the loading. The target is designed such that on initial loading, the outer cylinder will have a higher shock velocity than the inner material of interest. Conically converging shocks will be generated at the interface between the two materials due to the impedance mismatch. Upon convergence, an irregular reflection occurs and the conical analog of a Mach reflection develops. The Mach reflection will grow until it reaches a steady state, at which point the wave configuration becomes self similar. The resulting high pressure Hugoniot state can then be measured using velocity interferometry and impedance matching. The technique is demonstrated using a planar mechanical impact generated by a powder gun to study the shock response of copper. Two systems are examined which utilize either a low impedance (6061-T6 aluminum) or a high impedance (molybdenum) outer cylinder. A multipoint VISAR experiment will be presented to validate the technique, and will be compared to numerical simulations. The feasibility of measuring an entire Hugoniot curve using full field velocity interferometry (ORVIS) will also be discussed.

Item Type:Book Section
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Ravichandran, G.0000-0002-2912-0001
Additional Information:© 2012 American Institute of Physics. Published online 29 March 2012. 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 National Nuclear Security Administration under Award Number DE-FC52-08NA28613 is gratefully acknowledged.
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Department of Energy (DOE) National Nuclear Security AdministrationDE-FC52-08NA28613
Subject Keywords:Hugoniot, Mach reflection, converging shocks
Series Name:AIP Conference Proceedings
Issue or Number:1426
Classification Code:PACS: 47.40.Nm, 07.35.+k, 62.50.-p
Record Number:CaltechAUTHORS:20120409-074212038
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Official Citation:High pressure hugoniot measurements using mach waves Brown, Justin and Ravichandran, Guruswami, AIP Conference Proceedings, 1426, 485-488 (2012), DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:30027
Deposited By: Tony Diaz
Deposited On:10 Apr 2012 21:44
Last Modified:09 Mar 2020 13:19

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