Fatigue Life of Hybrid FRP Composite Beams

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dc.contributor.authorSenne, Jolyn Louiseen
dc.contributor.committeechairLesko, John J.en
dc.contributor.committeememberCousins, Thomas E.en
dc.contributor.committeememberCase, Scott W.en
dc.contributor.departmentEngineering Mechanicsen
dc.date.accessioned2014-03-14T20:41:22Zen
dc.date.adate2000-07-17en
dc.date.available2014-03-14T20:41:22Zen
dc.date.issued2000-07-10en
dc.date.rdate2001-07-17en
dc.date.sdate2000-07-13en
dc.description.abstractAs fiber reinforced polymer (FRP) structures find application in highway bridge structures, methodologies for describing their long-term performance under service loading will be a necessity for designers. The designer of FRP bridge structures is faced with out-of-plane damage and delamination at ply interfaces. The damage most often occurs between hybrid plys and dominates the life time response of a thick section FRP structure. The focus of this work is on the performance of the 20.3 cm (8 in) pultruded, hybrid double web I-beam structural shape. Experimental four-point bend fatigue results indicate that overall stiffness reduction of the structure is controlled by the degradation of the tensile flange. The loss of stiffness in the tensile flange results in the redistribution of the stresses and strains, until the initiation of failure by delamination in the compression flange. These observations become the basis of the assumptions used to develop an analytical life prediction model. In the model, the tensile flange stiffness is reduced based on coupon test data, and is used to determine the overall strength reduction of the beam in accordance the residual strength life prediction methodology. Delamination initiation is based on the out-of-plane stress sz at the free edge. The stresses are calculated using two different approximations, the Primitive Delamination Model and the Minimization of Complementary Energy. The model successfully describes the onset of delamination prior to fiber failure and suggests that out-of-plane failure controls the life of the structure.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-07132000-14530012en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07132000-14530012/en
dc.identifier.urihttp://hdl.handle.net/10919/33982en
dc.publisherVirginia Techen
dc.relation.haspartms_thesis_jsenne.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectpultruded compositesen
dc.subjecthybrid compositesen
dc.subjectfiber-reinforced polymer (FRP) compositesen
dc.subjectlife predictionen
dc.subjectFatigueen
dc.subjectinfrastructureen
dc.titleFatigue Life of Hybrid FRP Composite Beamsen
dc.typeThesisen
thesis.degree.disciplineEngineering Mechanicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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