Attenuation of the Dynamic Yield Point of Shocked Aluminum Using Elastodynamic Simulations of Dislocation Dynamics

Beñat Gurrutxaga-Lerma, Daniel S. Balint, Daniele Dini, Daniel E. Eakins, and Adrian P. Sutton
Phys. Rev. Lett. 114, 174301 – Published 28 April 2015
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Abstract

When a metal is subjected to extremely rapid compression, a shock wave is launched that generates dislocations as it propagates. The shock wave evolves into a characteristic two-wave structure, with an elastic wave preceding a plastic front. It has been known for more than six decades that the amplitude of the elastic wave decays the farther it travels into the metal: this is known as “the decay of the elastic precursor.” The amplitude of the elastic precursor is a dynamic yield point because it marks the transition from elastic to plastic behavior. In this Letter we provide a full explanation of this attenuation using the first method of dislocation dynamics to treat the time dependence of the elastic fields of dislocations explicitly. We show that the decay of the elastic precursor is a result of the interference of the elastic shock wave with elastic waves emanating from dislocations nucleated in the shock front. Our simulations reproduce quantitatively recent experiments on the decay of the elastic precursor in aluminum and its dependence on strain rate.

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  • Received 8 December 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.174301

© 2015 American Physical Society

Authors & Affiliations

Beñat Gurrutxaga-Lerma, Daniel S. Balint, and Daniele Dini

  • Department of Mechanical Engineering Imperial College London, London SW7 2AZ, United Kingdom

Daniel E. Eakins and Adrian P. Sutton

  • Department of Physics Imperial College London, London SW7 2AZ, United Kingdom

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Issue

Vol. 114, Iss. 17 — 1 May 2015

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