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Three-dimensional noncoaxial plasticity modeling of shear band formation in geomaterials / J. G. Qian in Journal of engineering mechanics, Vol. 134 N°4 (Avril 2008) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 134 N°4 (Avril 2008) . - pp.322–329. Titre : Three-dimensional noncoaxial plasticity modeling of shear band formation in geomaterials Type de document : texte imprimé Auteurs : J. G. Qian, Auteur ; J. Yang, Auteur ; M. S. Huang, Auteur Année de publication : 2008 Article en page(s) : pp.322–329. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Bifurcations  Constitutive  models  Three-dimensional  models  Geomaterials  Plasticity Résumé : Accurate prediction of shear band formation in geomaterials is crucial in the solution of various stability problems in geotechnical engineering. The initiation of shear band is strongly dependent on the constitutive description of the prelocalization homogeneous deformation. Conventional plasticity models assume that coaxiality exists between the directions of principal stresses and the directions of plastic strain increments. Accumulating evidence has however shown that this assumption is not appropriate. In this paper, a noncoaxial constitutive modeling platform is presented in a general three-dimensional stress space. It is shown that the classical vertex-like structure, which has been widely adopted to describe the noncoaxial constitutive response, only represents the two-dimensional condition. Examples are presented to demonstrate the capability of the modeling platform in capturing the initiation and orientation of shear band in a granular soil. The significance of the noncoaxiality effects is illustrated by comparisons of the predictions produced by coaxial and noncoaxial (both two-dimensional and three-dimensional) plasticity models. ISSN : 0733-9399 En ligne : http://ascelibrary.org/action/showAbstract?page=322&volume=134&issue=4&journalCo [...] [article] Three-dimensional noncoaxial plasticity modeling of shear band formation in geomaterials [texte imprimé] / J. G. Qian, Auteur ; J. Yang, Auteur ; M. S. Huang, Auteur . - 2008 . - pp.322–329. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 N°4 (Avril 2008) . - pp.322–329. Mots-clés : Bifurcations  Constitutive  models  Three-dimensional  models  Geomaterials  Plasticity Résumé : Accurate prediction of shear band formation in geomaterials is crucial in the solution of various stability problems in geotechnical engineering. The initiation of shear band is strongly dependent on the constitutive description of the prelocalization homogeneous deformation. Conventional plasticity models assume that coaxiality exists between the directions of principal stresses and the directions of plastic strain increments. Accumulating evidence has however shown that this assumption is not appropriate. In this paper, a noncoaxial constitutive modeling platform is presented in a general three-dimensional stress space. It is shown that the classical vertex-like structure, which has been widely adopted to describe the noncoaxial constitutive response, only represents the two-dimensional condition. Examples are presented to demonstrate the capability of the modeling platform in capturing the initiation and orientation of shear band in a granular soil. The significance of the noncoaxiality effects is illustrated by comparisons of the predictions produced by coaxial and noncoaxial (both two-dimensional and three-dimensional) plasticity models. ISSN : 0733-9399 En ligne : http://ascelibrary.org/action/showAbstract?page=322&volume=134&issue=4&journalCo [...]