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Strength of tantalum shocked at ultrahigh pressures

Stebner, Aaron P. and Wehrenberg, Christopher and Li, Bo and Randall, Greg C. and John, Kristen and Hudish, Grant A. and Maddox, Brian and Farrell, Michael and Park, Hye-Sook and Remington, Bruce and Ortiz, Michael and Ravichandran, G. (2018) Strength of tantalum shocked at ultrahigh pressures. Materials Science and Engineering A, 732 . pp. 220-227. ISSN 0921-5093.

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High purity polycrystalline tantalum (Ta) was shocked through 1 to 3.5 Mbar pressures creating Richtmyer-Meshkov unstable interfaces that were used to determine the dynamic material strength. The experiments were performed on the Omega laser at the University of Rochester Laboratory for Laser Energetics. Prior to shock, the driven surfaces of the tantalum targets where coined with a sinusoidal pattern. The targets were recovered post-shock, and the growth of the sinusoid amplitudes was used to characterize the relative extent of plastic deformation as a function of laser energy. Analogous data were extracted prior to the experiments from phenomenological Von Mises plasticity simulations that considered equation of state tables for Ta. The simulations showed the best agreement with the experiments (less than 5% difference between mean ripple growth measures) for shock pressures ranging from 1.2 to 2.7 Mbar. A fluid model studied as a function of viscosity was also used to qualitatively indicate the sensitivity of the experiments to strength. These results verify the ability to use a phenomenological, equation of state based model to simulate very high-strain rate, high-pressure deformation of tantalum.

Item Type:Article
Related URLs:
URLURL TypeDescription
Li, Bo0000-0002-8019-8891
Randall, Greg C.0000-0002-8375-9041
Ortiz, Michael0000-0001-5877-4824
Ravichandran, G.0000-0002-2912-0001
Additional Information:© 2018 Elsevier B.V. Received 15 May 2018, Accepted 27 June 2018, Available online 4 July 2018.
Subject Keywords:Richtmyer-Meshkov instability; laser compression; high rate, deformation
Record Number:CaltechAUTHORS:20180706-105716928
Persistent URL:
Official Citation:Aaron P. Stebner, Christopher E. Wehrenberg, Bo Li, Greg C. Randall, Kristen K. John, Grant A. Hudish, Brian R. Maddox, Michael Farrell, Hye-Sook Park, Bruce A. Remington, Michael Ortiz, G. Ravichandran, Strength of tantalum shocked at ultrahigh pressures, Materials Science and Engineering: A, Volume 732, 2018, Pages 220-227, ISSN 0921-5093, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87595
Deposited By: Tony Diaz
Deposited On:06 Jul 2018 18:06
Last Modified:09 Mar 2020 13:19

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