Nonuniform torsion of composite bars of variable thickness by BEM

Sapountzakis, EJ; Mokos, VG

dc.contributor.author	Sapountzakis, EJ	en
dc.contributor.author	Mokos, VG	en
dc.date.accessioned	2014-03-01T01:21:09Z
dc.date.available	2014-03-01T01:21:09Z
dc.date.issued	2004	en
dc.identifier.issn	0020-7683	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16090
dc.subject	Boundary element method	en
dc.subject	Composite bar	en
dc.subject	Nonuniform torsion	en
dc.subject	Twist	en
dc.subject	Variable thickness	en
dc.subject	Warping	en
dc.subject.classification	Mechanics	en
dc.subject.other	Boundary element method	en
dc.subject.other	Boundary value problems	en
dc.subject.other	Composite materials	en
dc.subject.other	Inclusions	en
dc.subject.other	Shear stress	en
dc.subject.other	Thickness measurement	en
dc.subject.other	Warping constants	en
dc.subject.other	Torsion testing	en
dc.subject.other	structural component	en
dc.subject.other	torsion	en
dc.title	Nonuniform torsion of composite bars of variable thickness by BEM	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.ijsolstr.2003.11.025	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.ijsolstr.2003.11.025	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	In this paper a boundary element method is developed for the nonuniform torsion of composite bars of arbitrary variable cross section. The composite bar consists of materials in contact each of which can surround a finite number of inclusions. The bar is subjected to an arbitrarily concentrated or distributed twisting moment, while its edges are restrained by the most general linear torsional boundary conditions. The developed procedure takes into account the variable torsional and warping rigidities along the member length. Three boundary value problems with respect to the variable along the bar angle of twist and to the primary and secondary warping functions are formulated and solved employing a pure BEM approach, that is only boundary discretization is used. Both the variable warping and torsion constants together with the torsional shear stresses and the warping normal and shear stresses are computed. Numerical results are presented to illustrate the method and demonstrate its efficiency and accuracy. The discrepancy in the analysis of a thin-walled cross section composite bar employing the FEM and using a fine mesh of shell elements or employing BEM after calculating the torsion and warping constants adopting the thin tube theory demonstrates the importance of the proposed procedure even in thin-walled bars, since it approximates better the torsion and warping constants and takes also into account the warping of the walls of the cross section. (C) 2003 Elsevier 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/j.ijsolstr.2003.11.025	en
dc.identifier.isi	ISI:000189227000002	en
dc.identifier.volume	41	en
dc.identifier.issue	7	en
dc.identifier.spage	1753	en
dc.identifier.epage	1771	en