Influence of nonassociativity on localization and failure in geomechanics based on gradient elastoplasticity

Zervos, A; Vardoulakis, I; Papanastasiou, P

dc.contributor.author	Zervos, A	en
dc.contributor.author	Vardoulakis, I	en
dc.contributor.author	Papanastasiou, P	en
dc.date.accessioned	2014-03-01T01:26:29Z
dc.date.available	2014-03-01T01:26:29Z
dc.date.issued	2007	en
dc.identifier.issn	15323641	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18097
dc.subject	Bifurcations	en
dc.subject	Deformation	en
dc.subject	Elastoplasticity	en
dc.subject	Gradient	en
dc.subject.other	Continuum mechanics	en
dc.subject.other	Deformation	en
dc.subject.other	Elastoplasticity	en
dc.subject.other	Gradient elastoplasticity	en
dc.subject.other	Localized failure modes	en
dc.subject.other	Shearband formation	en
dc.subject.other	Geosynthetic materials	en
dc.subject.other	biaxial test	en
dc.subject.other	bifurcation	en
dc.subject.other	deformation mechanism	en
dc.subject.other	dilatancy	en
dc.subject.other	elastoplasticity	en
dc.subject.other	failure mechanism	en
dc.subject.other	geomechanics	en
dc.subject.other	shear band	en
dc.subject.other	stress field	en
dc.title	Influence of nonassociativity on localization and failure in geomechanics based on gradient elastoplasticity	en
heal.type	journalArticle	en
heal.identifier.primary	10.1061/(ASCE)1532-3641(2007)7:1(63)	en
heal.identifier.secondary	http://dx.doi.org/10.1061/(ASCE)1532-3641(2007)7:1(63)	en
heal.publicationDate	2007	en
heal.abstract	We present results of a parametric study on shearband formation in geomaterials, examining the influence of material dilatancy on shearband properties. The study is based on a new higher order continuum theory, called gradient elastoplasticity, developed to model localization of deformation. We present results for two problems with different initial stress fields: The biaxial test and the hollow cylinder test. We show that nonassociativity promotes bifurcation at lower deformation, leading to localized deformation and more abrupt final failure. Both the inclination and thickness of the calculated shearbands decrease with increasing nonassociativity. Gradient elastoplasticity is capable of reproducing the experimentally observed localized failure modes, including details such as reorientation of shearband close to a free boundary. © ASCE.	en
heal.journalName	International Journal of Geomechanics	en
dc.identifier.doi	10.1061/(ASCE)1532-3641(2007)7:1(63)	en
dc.identifier.volume	7	en
dc.identifier.issue	1	en
dc.identifier.spage	63	en
dc.identifier.epage	74	en