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Journal Articles Physical Review Letters Year : 2015

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.
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Dates and versions

hal-01514677 , version 1 (17-12-2019)

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J. Weiss, Wafa Ben Rhouma, T. Richeton, Stéphanie Deschanel, F. Louchet, et al.. From Mild to Wild Fluctuations in Crystal Plasticity. Physical Review Letters, 2015, 114 (10), ⟨10.1103/PhysRevLett.114.105504⟩. ⟨hal-01514677⟩
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