Modelling of localisation and scale effect in thick-walled cylinders with gradient elastoplasticity

Zervos, A; Papanastasiou, P; Vardoulakis, I

dc.contributor.author	Zervos, A	en
dc.contributor.author	Papanastasiou, P	en
dc.contributor.author	Vardoulakis, I	en
dc.date.accessioned	2014-03-01T01:16:46Z
dc.date.available	2014-03-01T01:16:46Z
dc.date.issued	2001	en
dc.identifier.issn	0020-7683	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14206
dc.subject	Gradient elastoplasticity	en
dc.subject	Gradient plasticity	en
dc.subject	Localisation of deformation	en
dc.subject	Scale effect	en
dc.subject	Shear band	en
dc.subject	Thick-walled cylinder	en
dc.subject.classification	Mechanics	en
dc.subject.other	Deformation	en
dc.subject.other	Elastoplasticity	en
dc.subject.other	Failure analysis	en
dc.subject.other	Finite element method	en
dc.subject.other	Mathematical models	en
dc.subject.other	Strain	en
dc.subject.other	Structural analysis	en
dc.subject.other	Load displacement	en
dc.subject.other	Strain softening	en
dc.subject.other	Cylinders (shapes)	en
dc.subject.other	failure	en
dc.title	Modelling of localisation and scale effect in thick-walled cylinders with gradient elastoplasticity	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0020-7683(00)00337-1	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0020-7683(00)00337-1	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	We model the progressive localisation of deformation which causes failure around thick-walled cylinders under external radial pressure. The study is based on a second-gradient elastoplastic model developed to regularise the ill-posedness caused by material strain-softening behaviour. The stress increment is related to both the strain increment and its Laplacian. The gradient terms introduce an internal length scale to the material allowing robust modelling of its post-peak behaviour. The numerical implementation is based on a C-1 finite element displacement formulation. Mesh insensitivity in terms of load-displacement and failure mechanism is demonstrated. The internal length in the constitutive equations enables modelling of the scale effect in thick-walled cylinders, according to which the load required to induce failure appears to be much larger for small holes than for large holes. (C) 2001 Elsevier Science Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	International Journal of Solids and Structures	en
dc.identifier.doi	10.1016/S0020-7683(00)00337-1	en
dc.identifier.isi	ISI:000169368700003	en
dc.identifier.volume	38	en
dc.identifier.issue	30-31	en
dc.identifier.spage	5081	en
dc.identifier.epage	5095	en