Simple yield surface expressions appropriate for soil plasticity

Taiebat, M; Dafalias, YF

dc.contributor.author	Taiebat, M	en
dc.contributor.author	Dafalias, YF	en
dc.date.accessioned	2014-03-01T01:59:55Z
dc.date.available	2014-03-01T01:59:55Z
dc.date.issued	2010	en
dc.identifier.issn	15323641	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29056
dc.subject	Kinematic hardening	en
dc.subject	Sand and clay	en
dc.subject	Soil anisotropy	en
dc.subject	Soil plasticity	en
dc.subject	Yield surface shape	en
dc.subject.other	Analytical expressions	en
dc.subject.other	Geomaterials	en
dc.subject.other	Internal variables	en
dc.subject.other	Intersecting surfaces	en
dc.subject.other	Kinematic hardening	en
dc.subject.other	Multiaxial	en
dc.subject.other	Multiaxial stress	en
dc.subject.other	Multiple function	en
dc.subject.other	Rotational hardening	en
dc.subject.other	Soil anisotropy	en
dc.subject.other	Soil plasticity	en
dc.subject.other	Soil types	en
dc.subject.other	Stress space	en
dc.subject.other	Triaxial loading	en
dc.subject.other	Triaxial stress	en
dc.subject.other	Yield function	en
dc.subject.other	Yield surface	en
dc.subject.other	Anisotropy	en
dc.subject.other	Hardening	en
dc.subject.other	Kinematics	en
dc.subject.other	Plasticity	en
dc.subject.other	Soils	en
dc.subject.other	Stress analysis	en
dc.subject.other	Geologic models	en
dc.subject.other	hardening	en
dc.subject.other	kinematics	en
dc.subject.other	plasticity	en
dc.subject.other	soil property	en
dc.subject.other	soil type	en
dc.subject.other	stress analysis	en
dc.subject.other	triaxial test	en
dc.title	Simple yield surface expressions appropriate for soil plasticity	en
heal.type	journalArticle	en
heal.identifier.primary	10.1061/(ASCE)GM.1943-5622.0000059	en
heal.identifier.secondary	http://dx.doi.org/10.1061/(ASCE)GM.1943-5622.0000059	en
heal.identifier.secondary	003004QGM	en
heal.publicationDate	2010	en
heal.abstract	The objective of this paper is to present a number of simple, practical, and useful analytical expressions of a yield surface for geomaterials. In classical plasticity, the analytical expression of a yield surface defines the locus of points in stress space at which plastic flow initiates, and the corresponding function must depend on direct and mixed invariants of stress and tensor-valued internal variables. One single function describes a yield surface in order to avoid singularities and computational difficulties arising from the use of multiple functions representing intersecting surfaces in stress space that are often used for cap-type models in soil plasticity. The presented functions are conveniently subdivided in three main categories depending on the type of analytical expression used, and they all describe properly closed yield surfaces which are continuous and convex. The internal variables in these functions can be used in order to address classical plasticity features such as isotropic and kinematic hardening, the latter in the form of rotational hardening. The effects of parameters on the shape of yield surfaces are clearly demonstrated and illustrated for all functions in triaxial stress space. The generalization of these functions to the multiaxial stress space is presented using a consistent method such that if one applies triaxial loading conditions on the multiaxial expressions, the triaxial ones are retrieved. Finally, the appropriateness of the yield functions in regards to the soil type is discussed. © 2010 ASCE.	en
heal.journalName	International Journal of Geomechanics	en
dc.identifier.doi	10.1061/(ASCE)GM.1943-5622.0000059	en
dc.identifier.volume	10	en
dc.identifier.issue	4	en
dc.identifier.spage	161	en
dc.identifier.epage	169	en