Combined mechanical loading of composite tubes

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dc.contributor.authorDerstine, Mark S.en
dc.contributor.committeechairPindera, Marek-Jerzyen
dc.contributor.committeememberHyer, Michael W.en
dc.contributor.committeememberJohnson, Eric R.en
dc.contributor.departmentEngineering Mechanicsen
dc.date.accessioned2014-03-14T21:40:58Zen
dc.date.adate2010-07-21en
dc.date.available2014-03-14T21:40:58Zen
dc.date.issued1988-06-05en
dc.date.rdate2010-07-21en
dc.date.sdate2010-07-21en
dc.description.abstractAn analytical/experimental investigation was performed to study the effect of material nonlinearities on the response of composite tubes subjected to combined axial and torsional loading. An elasticity based analytical model was developed to predict stresses and deformations in composite tubes subjected to combined thermomechanical loading. Material nonlinearities were modeled using the Endochronic Theory. The effect of residual stresses on subsequent mechanical response was included in the investigation. Subsequently, experiments were performed on P75/934 graphite/epoxy tubes with a stacking sequence of [15/1/ ± 10/0/-15], using pure torsion and combined axial/torsional loading. The in-plane material properties needed for incorporation into the analytical model were determined using tests on flat coupons made from P75/934. In the presence of residual stresses. the analytical model predicted a reduction in the Initial shear modulus of a tube subjected to torsional loading. Experimentally. a difference in the nonlinearity of the stress-strain response was found between pure torsion loading and combined proportional loading. This difference is due to coupling between axial loading and shear strain. These phenomena were predicted by the nonlinear analytical model where a linear model did not. The experimentally observed linear limit of the global shear response was found to correspond to the analytically predicted first ply failure. The observed nonlinear response thus appears to be due to a combination of material response at the ply level and gradual damage accumulation. Further, based on cyclic torsion tests, the failure of the tubes was found to be path dependent above a certain critical load level.en
dc.description.degreeMaster of Scienceen
dc.format.extentxi, 188 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-07212010-020302en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07212010-020302/en
dc.identifier.urihttp://hdl.handle.net/10919/43841en
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1988.D477.pdfen
dc.relation.isformatofOCLC# 18679562en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1988.D477en
dc.subject.lcshComposite materialsen
dc.subject.lcshLaminated materialsen
dc.titleCombined mechanical loading of composite tubesen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineEngineering Mechanicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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