SMA-induced deformations in unsymmetric cross-ply laminates

dc.contributor.authorDano, Marie-Laureen
dc.contributor.committeechairHyer, Michael W.en
dc.contributor.committeememberJohnson, Eric R.en
dc.contributor.committeememberGriffin, Odis Hayden Jr.en
dc.contributor.departmentEngineering Mechanicsen
dc.date.accessioned2014-03-14T21:45:50Zen
dc.date.adate2009-09-12en
dc.date.available2014-03-14T21:45:50Zen
dc.date.issued1993-06-05en
dc.date.rdate2009-09-12en
dc.date.sdate2009-09-12en
dc.description.abstractPresented is a model for predicting SMA-induced deformations in an unsymmetric cross ply laminate. A previously developed theory is used to predict the room-temperature shape of the cross-ply laminate by minimizing its total potential energy. Then, using the principle of virtual work, equations relating the shape of the laminate to a force applied on supports fastened to the laminate are derived. Induced strains and displacements are predicted as a function of the applied force. Experiments where the force is generated by known weights are conducted. Good correlations are established between the experimental results and the predictions. The developed theory is able to predict with good accuracy the shape, strains and, displacements of an unsymmetric cross-ply laminate to the force applied on the laminate. This theory is then used to develop a model relating the laminate response to forces produced by a SMA actuator, the actuator being a SMA wire. To describe the mechanics of the SMA actuator, constitutive equations derived by other researchers are used. These constitutive equations relate the temperature of the wire to forces generated in it. Experiments where a SMA wire is used as an actuator are conducted. These experiments consist of resistively heating a SMA wire attached to supports fastened to the laminate. During these experiments, laminate deformations are measured as a function of the applied voltage. Comparisons with the temperature-based constitutive model predictions are not made since the relation between the applied voltage and the SMA temperature is very difficult to establish. However, the experiments show that a SMA used in conjunction with cross-ply unsymmetric laminates can induce very large changes in the laminate shapes. Thus, the concept of using a SMA actuator to control the shape of cross-ply unsymmetric laminates is validated.en
dc.description.degreeMaster of Scienceen
dc.format.extentxii, 125 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-09122009-040504en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09122009-040504/en
dc.identifier.urihttp://hdl.handle.net/10919/44767en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1993.D366.pdfen
dc.relation.isformatofOCLC# 29040799en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1993.D366en
dc.subject.lcshAlloysen
dc.subject.lcshDeformations (Mechanics)en
dc.subject.lcshLaminated materialsen
dc.subject.lcshShape memory effecten
dc.subject.lcshShape theory (Topology)en
dc.titleSMA-induced deformations in unsymmetric cross-ply laminatesen
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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