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Discontinuous yielding of pristine micro-crystals

Abstract : We study the mechanical response of a dislocation-free 2D crystal under homogenous shear using a new mesoscopic approach to crystal plasticity, a Landau-type theory, accounting for the global invariance of the energy in the space of strain tensors while operating with an infinite number of equivalent energy wells. The advantage of this approach is that it eliminates arbitrariness in dealing with topological transitions involved, for instance, in nucleation and annihilation of dislocations. We use discontinuous yielding of pristine micro-crystals as a benchmark problem for the new theory and show that the nature of the catastrophic instability, which in this setting inevitably follows the standard affine response, depends not only on lattice symmetry but also on the orientation of the crystal in the loading device. The ensuing dislocation avalanche involves cooperative dislocation nucleation, resulting in the formation of complex microstructures controlled by a nontrivial self-induced coupling between different plastic mechanisms.
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https://hal.archives-ouvertes.fr/hal-03366231
Contributor : Oguz Salman Connect in order to contact the contributor
Submitted on : Tuesday, October 5, 2021 - 3:39:10 PM
Last modification on : Friday, November 26, 2021 - 5:56:04 PM

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Oguz Umut Salman, Roberta Baggio, Brigitte Bacroix, Giovanni Zanzotto, Nikolai Gorbushin, et al.. Discontinuous yielding of pristine micro-crystals. Comptes Rendus. Physique, Académie des sciences (Paris), 2021, ⟨10.5802/crphys.77⟩. ⟨hal-03366231⟩

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