000004876 001__ 4876 000004876 005__ 20141119144601.0 000004876 04107 $$aeng 000004876 046__ $$k2002-06-02 000004876 100__ $$aRegueiro, Richard A. 000004876 24500 $$aTHREE DIMENSIONAL MODELING OF SLIP SURFACES IN GEOMATERIALS 000004876 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference 000004876 260__ $$bColumbia University in the City of New York 000004876 506__ $$arestricted 000004876 520__ $$2eng$$aA three-dimensional finite element implementation of a simple nonassociative Drucker-Prager plasticity model with strong discontinuity mode of localized deformation is formulated for small deformations. A strong discontinuity mode of localized deformation represents slip along a surface of zero measure, whereas a weak discontinuity mode of localized deformation represents shear within a band of finite thickness. A numerical algorithm that detects onset of localization for three-dimensional stress states and the possible normals to slip planes within a three-dimensional finite element is demonstrated. An enhanced strain hexahedral finite element accounting for the various slip-plane cutting conditions is described. This model and finite element lead to mesh-independent solutions with regard to mesh refinement and mesh alignment. A simple three dimensional numerical example demonstrates the numerical algorithm for determining onset of localization. 000004876 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb. 000004876 653__ $$alocalized deformation, slip surfaces, pressure-sensitive materials, strong discontinuity plasticity 000004876 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002 000004876 720__ $$aRegueiro, Richard A.$$iFoster, Craig D.$$iBorja, Ronaldo I. 000004876 8560_ $$ffischerc@itam.cas.cz 000004876 8564_ $$s111098$$uhttps://invenio.itam.cas.cz/record/4876/files/472.pdf$$yOriginal version of the author's contribution as presented on CD, . 000004876 962__ $$r4594 000004876 980__ $$aPAPER