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Viscoplasticité et Hétérogénéités de déformation du monocristal de glace: expériences et simulations

Abstract : Ice has an hexagonal crystallographic structure and exhibits a strongly anisotropic viscoplastic behaviour as it deforms almost exclusively by glide of basal dislocations. Creep torsion tests are carried out on single crystals with the crystallographic c-axis colinear to the torsion axis so that only basal systems are activated by the applied stress. Other glide systems need to be activated to explain the creep that is experimentally observed. We propose a double cross-slip multiplication mechanism of basal dislocations via prismatic planes that would be triggered by internal stresses. This scenario is tested using Discrete Dislocations Dynamics (DDD) simulations. A continuous dislocation dynamics model is also used to explain some particularities of ice plasticity. Finally, crystallographic lattice distorsions are characterized by means of hard X-ray diffraction. That enables us to evidence and analyse strain heterogeneities and to compare the results to what can be obtained through DDD simulations
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Submitted on : Thursday, June 18, 2009 - 9:39:34 AM
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  • HAL Id : tel-00396410, version 1

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Juliette Chevy. Viscoplasticité et Hétérogénéités de déformation du monocristal de glace: expériences et simulations. Matériaux. Institut National Polytechnique de Grenoble - INPG, 2008. Français. ⟨tel-00396410⟩

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