From Mild to Wild Fluctuations in Crystal Plasticity

J. Weiss, W. Ben Rhouma, T. Richeton, S. Dechanel, F. Louchet, and L. Truskinovsky
Phys. Rev. Lett. 114, 105504 – Published 11 March 2015
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Abstract

Macroscopic crystal plasticity is classically viewed as an outcome of uncorrelated dislocation motions producing Gaussian fluctuations. An apparently conflicting picture emerged in recent years emphasizing highly correlated dislocation dynamics characterized by power-law distributed fluctuations. We use acoustic emission measurements in crystals with different symmetries to show that intermittent and continuous visions of plastic flow are not incompatible. We demonstrate the existence of crossover regimes where strongly intermittent events coexist with a Gaussian quasiequilibrium background and propose a simple theoretical framework compatible with these observations.

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  • Received 12 October 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.105504

© 2015 American Physical Society

Authors & Affiliations

J. Weiss1,4, W. Ben Rhouma2, T. Richeton3, S. Dechanel2, F. Louchet4, and L. Truskinovsky5,*

  • 1IsTerre, CNRS/Université Grenoble Alpes, 38401 Grenoble, France
  • 2MATEIS, CNRS/INSA, 7 Avenue Jean Capelle, 69621 Villeurbanne, France
  • 3LEM3, CNRS/Université de Lorraine, Ile du Saulcy, 57045 Metz, France
  • 4LGGE, CNRS/Université Grenoble Alpes, 38401 Grenoble, France
  • 5LMS, CNRS-UMR 7649, Ecole Polytechnique, Route de Saclay, 91128 Palaiseau, France

  • *Corresponding author. trusk@lms.polytechnique.fr

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Vol. 114, Iss. 10 — 13 March 2015

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