SANISAND: Simple anisotropic sand plasticity model

Taiebat, M; Dafalias, YF

dc.contributor.author	Taiebat, M	en
dc.contributor.author	Dafalias, YF	en
dc.date.accessioned	2014-03-01T01:29:06Z
dc.date.available	2014-03-01T01:29:06Z
dc.date.issued	2008	en
dc.identifier.issn	0363-9061	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19130
dc.subject	Anisotropy	en
dc.subject	Constitutive relations	en
dc.subject	Critical state	en
dc.subject	Plasticity	en
dc.subject	Sand	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Mechanics	en
dc.subject.other	Anisotropy	en
dc.subject.other	Constitutive models	en
dc.subject.other	Critical current density (superconductivity)	en
dc.subject.other	Elasticity	en
dc.subject.other	Foundations	en
dc.subject.other	Geologic models	en
dc.subject.other	Hardening	en
dc.subject.other	Loading	en
dc.subject.other	Mechanics	en
dc.subject.other	Plastic deformation	en
dc.subject.other	Plasticity	en
dc.subject.other	Plastics	en
dc.subject.other	Soil mechanics	en
dc.subject.other	Speed	en
dc.subject.other	Strain	en
dc.subject.other	Strain rate	en
dc.subject.other	Stresses	en
dc.subject.other	Analytical description	en
dc.subject.other	Bounding surface plasticity	en
dc.subject.other	Calibration procedures	en
dc.subject.other	Confining pressures	en
dc.subject.other	Constant stress ratio	en
dc.subject.other	Constant stresses	en
dc.subject.other	Critical state soil mechanics	en
dc.subject.other	Elastic response]	en
dc.subject.other	Isotropic hardenings	en
dc.subject.other	Loading conditions	en
dc.subject.other	Model constants	en
dc.subject.other	Model formulation	en
dc.subject.other	Multiaxial	en
dc.subject.other	Plastic strain rate	en
dc.subject.other	Plastic straining	en
dc.subject.other	Plasticity modelling	en
dc.subject.other	Predictive capabilities	en
dc.subject.other	Rotational hardening	en
dc.subject.other	Stress ratios	en
dc.subject.other	Triaxial (IGC: D7)	en
dc.subject.other	Triaxial stresses	en
dc.subject.other	Undrained behavior	en
dc.subject.other	Various densities	en
dc.subject.other	Yield surfaces	en
dc.subject.other	Plastic parts	en
dc.subject.other	anisotropy	en
dc.subject.other	calibration	en
dc.subject.other	computer simulation	en
dc.subject.other	constitutive equation	en
dc.subject.other	loading	en
dc.subject.other	modeling	en
dc.subject.other	plastic deformation	en
dc.subject.other	plasticity	en
dc.subject.other	sandy soil	en
dc.subject.other	soil mechanics	en
dc.subject.other	soil test	en
dc.subject.other	stress analysis	en
dc.subject.other	triaxial test	en
dc.title	SANISAND: Simple anisotropic sand plasticity model	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/nag.651	en
heal.identifier.secondary	http://dx.doi.org/10.1002/nag.651	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	SANISAND is the name used for a family of simple anisotropic sand constitutive models developed over the past few years within the framework of critical state soil mechanics and bounding surface plasticity. The existing SANISAND models use a narrow open cone-type yield surface with apex at the origin obeying rotational hardening, which implies that only changes of the stress ratio can cause plastic deformations, while constant stress-ratio loading induces only elastic response. In order to circumvent this limitation, the present member of the SANISAND family introduces a modified eight-curve equation as the analytical description of a narrow but closed cone-type yield surface that obeys rotational and isotropic hardening. This modification enables the prediction of plastic strains during any type of constant stress-ratio loading, a feature lacking from the previous SANISAND models, without losing their well-established predictive capability for all other loading conditions including the cyclic. In the process the plausible assumption is made that the plastic strain rate decomposes in two parts, one due to the change of stress ratio and a second due to loading under constant stress ratio, with isotropic hardening depending on the volumetric component of the latter part only. The model formulation is presented firstly in the triaxial stress space and subsequently its multiaxial generalization is developed following systematically the steps of the triaxial one. A detailed calibration procedure for the model constants is presented, while successful simulation of both drained and undrained behavior of sands under constant and variable stress-ratio loadings at various densities and confining pressures is obtained by the model. Copyright (C) 2007 John Wiley & Sons, Ltd.	en
heal.publisher	JOHN WILEY & SONS LTD	en
heal.journalName	International Journal for Numerical and Analytical Methods in Geomechanics	en
dc.identifier.doi	10.1002/nag.651	en
dc.identifier.isi	ISI:000256817600003	en
dc.identifier.volume	32	en
dc.identifier.issue	8	en
dc.identifier.spage	915	en
dc.identifier.epage	948	en