Energy dissipation and post-bifurcation behaviour of granular soils

Gutierrez, MS; Vardoulakis, I

dc.contributor.author	Gutierrez, MS	en
dc.contributor.author	Vardoulakis, I	en
dc.date.accessioned	2014-03-01T01:26:17Z
dc.date.available	2014-03-01T01:26:17Z
dc.date.issued	2007	en
dc.identifier.issn	0363-9061	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17986
dc.subject	Bifurcation	en
dc.subject	Constitutive models	en
dc.subject	Dilatancy	en
dc.subject	Granular soils	en
dc.subject	Localization	en
dc.subject	Non-coaxiality	en
dc.subject	Shear strength	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Mechanics	en
dc.subject.other	Constitutive models	en
dc.subject.other	Heat losses	en
dc.subject.other	Plastic flow	en
dc.subject.other	Shear bands	en
dc.subject.other	Shear deformation	en
dc.subject.other	Shear strength	en
dc.subject.other	Non-coaxial plastic flow	en
dc.subject.other	Post-bifurcation shearing	en
dc.subject.other	Principal stress rotation	en
dc.subject.other	Stress-dilatancy	en
dc.subject.other	Soil mechanics	en
dc.subject.other	Constitutive models	en
dc.subject.other	Heat losses	en
dc.subject.other	Plastic flow	en
dc.subject.other	Shear bands	en
dc.subject.other	Shear deformation	en
dc.subject.other	Shear strength	en
dc.subject.other	Soil mechanics	en
dc.subject.other	bifurcation	en
dc.subject.other	constitutive equation	en
dc.subject.other	dilatancy	en
dc.subject.other	energy dissipation	en
dc.subject.other	granular medium	en
dc.subject.other	numerical model	en
dc.subject.other	plastic flow	en
dc.subject.other	shear strength	en
dc.subject.other	soil mechanics	en
dc.title	Energy dissipation and post-bifurcation behaviour of granular soils	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/nag.588	en
heal.identifier.secondary	http://dx.doi.org/10.1002/nag.588	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	Extensive experimental data indicate that plastic flow in granular materials is non-coaxial (i.e. the principal directions of the plastic strain increment tensor and the stress tensor do not coincide) for loadings involving principal stress rotation. The degree of non-coaxiality depends on the magnitude of principal stress rotation, hence plastic flow is also incrementally non-linear. The paper presents an analysis and discussion of the effects of non-coaxial plastic flow on the post-bifurcation response of dilatant granular materials. Significant differences are observed between the energy dissipation and stress-dilatancy response of soils before and after shear-band formation. These differences are attributed to the non-coaxiality of plastic flow during post-bifurcation shearing. In turn, the non-coaxiality is attributed to principal stress rotation within the shear band, which is consistent with the assumption that the materials inside the shear undergo simple shear deformation. Experimental data are presented to support the analytical results. Copyright (c) 2006 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.588	en
dc.identifier.isi	ISI:000245332800005	en
dc.identifier.volume	31	en
dc.identifier.issue	3	en
dc.identifier.spage	435	en
dc.identifier.epage	455	en