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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Physical Review Letters, American Physical Society, 2015, 114 (10), 〈10.1103/PhysRevLett.114.105504〉
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https://hal.univ-lorraine.fr/hal-01514677
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Soumis le : mercredi 26 avril 2017 - 15:24:36
Dernière modification le : mercredi 14 novembre 2018 - 01:19:01

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

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