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Dislocation density evolution and interactions in crystalline materials / P. Shanthraj in Acta materialia, Vol. 59 N° 20 (Décembre 2011) 

Public ISBD [article]  in Acta materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7695–7702 Titre : Dislocation density evolution and interactions in crystalline materials Type de document : texte imprimé Auteurs : P. Shanthraj, Auteur ; M.A. Zikry, Auteur Année de publication : 2012 Article en page(s) : pp. 7695–7702 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Dislocation  density  Computational  model  Crystal  plasticity  Localization Résumé : Dislocation density-based evolution formulations that are related to a heterogeneous microstructure and are physically representative of different crystalline interactions have been developed. The balance between the generation and annihilation of dislocations, through glissile and forest interactions at the slip system level, is taken as the basis for the evolution of mobile and immobile dislocation densities. The evolution equations are coupled to a multiple slip crystal plasticity formulation, and a framework is established that relates it to a general class of crystallographies and deformation modes. Specialized finite element (FE) methodologies have then been used to investigate how certain dislocation density activities, such as dislocation density interactions and immobilization, are directly related to strain hardening and microstructure evolution. The predictions are validated with channel die compressed (CDC) experiments, and are consistent with inelastic deformation modes of fcc metals. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645411006185 [article] Dislocation density evolution and interactions in crystalline materials [texte imprimé] / P. Shanthraj, Auteur ; M.A. Zikry, Auteur . - 2012 . - pp. 7695–7702. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7695–7702 Mots-clés : Dislocation  density  Computational  model  Crystal  plasticity  Localization Résumé : Dislocation density-based evolution formulations that are related to a heterogeneous microstructure and are physically representative of different crystalline interactions have been developed. The balance between the generation and annihilation of dislocations, through glissile and forest interactions at the slip system level, is taken as the basis for the evolution of mobile and immobile dislocation densities. The evolution equations are coupled to a multiple slip crystal plasticity formulation, and a framework is established that relates it to a general class of crystallographies and deformation modes. Specialized finite element (FE) methodologies have then been used to investigate how certain dislocation density activities, such as dislocation density interactions and immobilization, are directly related to strain hardening and microstructure evolution. The predictions are validated with channel die compressed (CDC) experiments, and are consistent with inelastic deformation modes of fcc metals. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645411006185