Positive and negative failure-shears in orthotropic materials

Theocaris, PS

dc.contributor.author	Theocaris, PS	en
dc.date.accessioned	2014-03-01T01:09:00Z
dc.date.available	2014-03-01T01:09:00Z
dc.date.issued	1992	en
dc.identifier.issn	0731-6844	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10788
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0026732367&partnerID=40&md5=1a602b66da87c490aa6679b96e18cb4b	en
dc.subject.classification	Materials Science, Composites	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Plastics Laminates - Failure	en
dc.subject.other	Stresses - Shear	en
dc.subject.other	Anisotropic Solids	en
dc.subject.other	Elliptic Paraboloid	en
dc.subject.other	Failure Criterion	en
dc.subject.other	Orthotropic Materials	en
dc.subject.other	Shear Induced Failure	en
dc.subject.other	Plastics Laminates	en
dc.title	Positive and negative failure-shears in orthotropic materials	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1992	en
heal.abstract	Failure predictions of off-axis loaded fiber composite laminate are given according to the elliptic paraboloid failure criterion for anisotropic solids [1]. The failure condition assumes that for any anisotropic solid a safe triaxial loading path exists, along the hydrostatic compression, and thus the failure surface must be open-ended. By appropriately formulating the failure criterion, it is shown that the geometric interpretation of the failure surface in the principal stress space is an elliptic paraboloid (EPFS) whose axis of symmetry is parallel to the hydrostatic axis in the principal stress space. Because of the shape and position of the EPFS, the intersections by principal stress planes corresponding to loadings of off-axis laminate of a fiber composite are represented by ellipses whose origins are displaced from the origin of the stress reference frame. This fact creates unequal shear yield stresses in the positive and negative sense clearly manifested in a pure shear failure loading. The predictions of the above criterion for plane stress failure loadings of laminae, and especially for pure shear induced failures, are compared with existing experimental data for various fiber composites and are shown to be in satisfactory agreement.	en
heal.publisher	TECHNOMIC PUBL CO INC	en
heal.journalName	Journal of Reinforced Plastics and Composites	en
dc.identifier.isi	ISI:A1992HB83400002	en
dc.identifier.volume	11	en
dc.identifier.issue	1	en
dc.identifier.spage	32	en
dc.identifier.epage	55	en