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Three-dimensional multiscale bifurcation analysis of granular media / F. Prunier in Journal of engineering mechanics, Vol. 135 N° 6 (Juin 2009) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 135 N° 6 (Juin 2009) . - pp. 493-509 Titre : Three-dimensional multiscale bifurcation analysis of granular media Type de document : texte imprimé Auteurs : F. Prunier, Auteur ; F. Nicot, Auteur ; F. Darve, Auteur Article en page(s) : pp. 493-509 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Granular  materials  Material  properties  Three-dimensional  analysis  Bifurcations. Résumé : This paper deals with Hill's bifurcation criterion, which is very well suited to describe various failure modes in granular media. The first part of this paper is dedicated to the analytical and numerical investigation of this criterion by considering phenomenological constitutive relations: the incrementally piece-wise linear and nonlinear relations proposed by Darve. The 3D bifurcation domain and 3D cones of unstable directions are given for these two relations. A similar analysis is performed with a micromechanical model in the second part of the article. Finally, a qualitative comparison of the results obtained with these two different approaches leads us to some key conclusions about this material instability criterion, which is studied for the first time for general 3D conditions, by considering these nonconventional constitutive relations. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...] [article] Three-dimensional multiscale bifurcation analysis of granular media [texte imprimé] / F. Prunier, Auteur ; F. Nicot, Auteur ; F. Darve, Auteur . - pp. 493-509. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 135 N° 6 (Juin 2009) . - pp. 493-509 Mots-clés : Granular  materials  Material  properties  Three-dimensional  analysis  Bifurcations. Résumé : This paper deals with Hill's bifurcation criterion, which is very well suited to describe various failure modes in granular media. The first part of this paper is dedicated to the analytical and numerical investigation of this criterion by considering phenomenological constitutive relations: the incrementally piece-wise linear and nonlinear relations proposed by Darve. The 3D bifurcation domain and 3D cones of unstable directions are given for these two relations. A similar analysis is performed with a micromechanical model in the second part of the article. Finally, a qualitative comparison of the results obtained with these two different approaches leads us to some key conclusions about this material instability criterion, which is studied for the first time for general 3D conditions, by considering these nonconventional constitutive relations. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...]