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Using Richtmyer–Meshkov Instabilities to Estimate Metal Strength at Very High Rates

  • Michael B. Prime
  • William T. Buttler
  • Sky K. Sjue
  • Brian J. Jensen
  • Fesseha G. Mariam
  • David M. Oró
  • Cora L. Pack
  • Joseph B. Stone
  • Dale Tupa
  • Wendy Vogan-McNeil
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

Recently, Richtmyer–Meshkov instabilities (RMI) have been proposed for studying strength at strain rates up to 107/s. RMI experiments involve shocking a metal interface that has geometrical perturbations that invert and grow subsequent to the shock. As these perturbations grow, their growth may arrest, or they may grow unstably and eventually fail. The experiments observe the growth and arrest to study the specimen’s yield (deviatoric) strength. Along these lines we first review some RMI experimental results on Cu. Next, the paper presents explicit Lagrangian simulations used to help interpret the Cu RMI results and infer the strength, i.e. flow stress, of the target metal. A Preston-Tonks-Wallace (PTW) constitutive model is modified to be more accurate at the strain rates accessed in the experiment. The advantages and disadvantages of RMI, as compared to the Rayleigh–Taylor (shockless) instabilities that are used more commonly to infer strength, are discussed. The advantages of using simple velocimetry measurements in place of radiography are also discussed.

Keywords

Richtmyer–Meshkov instabilities Shock High strain rate Strength Rayleigh–Taylor 

Notes

Acknowledgments

We acknowledge the support of the pRad team in acquiring these data. In addition, we appreciate contributions to these experiments by members of the LANL MST-7 group where our Cu targets were machined and characterized by F. Garcia, B. Day and D. Schmidt.

This work was performed at Los Alamos National Laboratory, operated by the Los Alamos National Security, LLC for the National Nuclear Security Administration of the U.S. Department of Energy under contract DE-AC52-06NA25396. By acceptance of this article, the publisher recognizes that the U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or to allow others to do so, for U.S. Government purposes.

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Copyright information

© The Society for Experimental Mechanics, Inc. 2016

Authors and Affiliations

  • Michael B. Prime
    • 1
  • William T. Buttler
    • 1
  • Sky K. Sjue
    • 1
  • Brian J. Jensen
    • 1
  • Fesseha G. Mariam
    • 1
  • David M. Oró
    • 1
  • Cora L. Pack
    • 1
  • Joseph B. Stone
    • 1
  • Dale Tupa
    • 1
  • Wendy Vogan-McNeil
    • 1
  1. 1.Los Alamos National LaboratoryLos AlamosUSA

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