Nonlinear inelastic uniform torsion of composite bars by BEM

Sapountzakis, EJ; Tsipiras, VJ

dc.contributor.author	Sapountzakis, EJ	en
dc.contributor.author	Tsipiras, VJ	en
dc.date.accessioned	2014-03-01T01:31:21Z
dc.date.available	2014-03-01T01:31:21Z
dc.date.issued	2009	en
dc.identifier.issn	0045-7949	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19788
dc.subject	Boundary element method	en
dc.subject	Composite bar	en
dc.subject	Inelastic	en
dc.subject	Uniform torsion	en
dc.subject	Wagner strain	en
dc.subject	Warping	en
dc.subject.classification	Computer Science, Interdisciplinary Applications	en
dc.subject.classification	Engineering, Civil	en
dc.subject.other	Boundary value problems	en
dc.subject.other	Differential equations	en
dc.subject.other	Elastoplasticity	en
dc.subject.other	Initial value problems	en
dc.subject.other	Military operations	en
dc.subject.other	Numerical analysis	en
dc.subject.other	Polymer matrix composites	en
dc.subject.other	Rigidity	en
dc.subject.other	Rotation	en
dc.subject.other	Strain	en
dc.subject.other	Strain hardening	en
dc.subject.other	Stress-strain curves	en
dc.subject.other	Thin walled structures	en
dc.subject.other	Torsional stress	en
dc.subject.other	Weaving	en
dc.subject.other	Composite bar	en
dc.subject.other	Inelastic	en
dc.subject.other	Uniform torsion	en
dc.subject.other	Wagner strain	en
dc.subject.other	Warping	en
dc.subject.other	Boundary element method	en
dc.title	Nonlinear inelastic uniform torsion of composite bars by BEM	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.compstruc.2008.11.005	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.compstruc.2008.11.005	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	In this paper the elastic-plastic uniform torsion analysis of composite cylindrical bars of arbitrary cross-section consisting of materials in contact, each of which can surround a finite number of inclusions, taking into account the effect of geometric nonlinearity is presented employing the boundary element method. The stress-strain relationships for the materials are assumed to be elastic-plastic-strain hardening. The incremental torque-rotation relationship is computed based on the finite displacement (finite rotation) theory, that is the transverse displacement components are expressed so as to be valid for large rotations and the longitudinal normal strain includes the second-order geometric nonlinear term often described as the "Wagner strain". The proposed formulation does not stand on the assumption of a thin-walled structure and therefore the cross-section's torsional rigidity is evaluated exactly without using the so-called Saint Venant's torsional constant. The torsional rigidity of the cross-section is evaluated directly employing the primary warping function of the cross-section depending on both its shape and the progress of the plastic region. A boundary value problem with respect to the aforementioned function is formulated and solved employing a BEM approach. The influence of the second Piola-Kirch-hoff normal stress component to the plastic/elastic moment ratio in uniform inelastic torsion is demonstrated. (C) 2008 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Computers and Structures	en
dc.identifier.doi	10.1016/j.compstruc.2008.11.005	en
dc.identifier.isi	ISI:000263433100002	en
dc.identifier.volume	87	en
dc.identifier.issue	3-4	en
dc.identifier.spage	151	en
dc.identifier.epage	166	en