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A strain gradient approach to the mechanics of micro and nanocrystals

Abstract : The influence of grain size on the strength of ultra-fine grained and nanocrystalline materials is the subject of an increasing number of scientific studies. However, despite the progress made in this field, it is not yet possible to predict accurately and model the deformation behaviour of this type of materials. Few reliable data are available in the literature due to the complexity of the required experiments and to the high defect densities that some of these materials are known to contain. Moreover, the use of discrete modeling techniques such as atomistic approaches has a limited utility as the temporal and spatial scales are often unsuitable to address the real physical phenomena of interest in this work. In this doctoral thesis, a theoretical framework is proposed to study the deformation behaviour of polycrystalline materials with ultra-fine or nano-sized microstructures. To that purpose, continuum models able to predict size effects arising from mechanisms that are predominant at interfaces (i.e., grain boundaries) or surfaces are proposed. These models, which enable the study of large representative volume elements, have been formulated so as to be calibrated using results from atomistic and discrete dislocation dynamics simulations and experimental work.
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Submitted on : Wednesday, March 7, 2012 - 11:46:27 AM
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  • HAL Id : pastel-00677109, version 1


Nicolas Cordero. A strain gradient approach to the mechanics of micro and nanocrystals. Materials. École Nationale Supérieure des Mines de Paris, 2011. English. ⟨NNT : 2011ENMP0065⟩. ⟨pastel-00677109⟩



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