title: From mild to wild fluctuations in crystal plasticity.
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.
authors: IsTerre, CNRS/Université Grenoble Alpes, 38401 Grenoble, France.|LGGE, CNRS/Université Grenoble Alpes, 38401 Grenoble, France.
authors: J
authors: J
authors: Weiss
authors: MATEIS, CNRS/INSA, 7 Avenue Jean Capelle, 69621 Villeurbanne, France.
authors: W Ben
authors: WB
authors: Rhouma
authors: LEM3, CNRS/Université de Lorraine, Ile du Saulcy, 57045 Metz, France.
authors: T
authors: T
authors: Richeton
authors: MATEIS, CNRS/INSA, 7 Avenue Jean Capelle, 69621 Villeurbanne, France.
authors: S
authors: S
authors: Dechanel
authors: LGGE, CNRS/Université Grenoble Alpes, 38401 Grenoble, France.
authors: F
authors: F
authors: Louchet
authors: LMS, CNRS-UMR 7649, Ecole Polytechnique, Route de Saclay, 91128 Palaiseau, France.
authors: L
authors: L
authors: Truskinovsky