An experimental investigation of the behavior of Nitinol

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dc.contributor.authorDye, Tracy Earlen
dc.contributor.committeechairRogers, Craig A.en
dc.contributor.committeememberLeonard, Robert G.en
dc.contributor.committeememberRobertshaw, Harry H.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:47:01Zen
dc.date.adate2005-10-07en
dc.date.available2014-03-14T21:47:01Zen
dc.date.issued1990-08-05en
dc.date.rdate2005-10-07en
dc.date.sdate2005-10-07en
dc.description.abstractShape memory alloys (SMA) have the unique ability to recover large strains and generate large recovery stresses via a repeatable martensitic transformation. Stress-strain and shape memory effect characteristics are needed in order to develop SMA force actuator design methods. Moreover, constitutive models able to quantitatively predict these characteristics and thus be useful as engineering design tools are also needed. An experimental apparatus designed to characterize the mechanical behavior of SMA was built and utilized. The apparatus is used specifically to gather stress-strain and shape memory effect characteristics from nitinol wire whereby mechanical properties associated with the material are determined. Phenomena such as the R-phase and stress induced martensite serration are investigated. A one-dimensional constitutive model is presented that quantitatively predicts stress-strain and shape memory effect behavior and was developed with the intention of being an engineering design tool for SMA force actuators. Experimental stress-strain and shape memory effect results are compared against that predicted by the model with the intention of verifying the model. The model displays the ability to predict stress-strain behavior that is in good quantitative agreement with experiment. The model also displays the ability to predict hysteric shape memory effect behavior for free, controlled, and restrained recovery cases of selected prestrains that is in good quantitative agreement with experiment. The model is unable to predict shape memory effect behavior such as the R-phase. Demonstrating the ability to experimentally investigate a constitutive model will hopefully inspire further combined experimental and theoretical SMA research.en
dc.description.degreeMaster of Scienceen
dc.format.extentxviii, 200 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10072005-094812en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10072005-094812/en
dc.identifier.urihttp://hdl.handle.net/10919/45048en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1990.D94.pdfen
dc.relation.isformatofOCLC# 23588313en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1990.D94en
dc.subject.lcshShape memory effecten
dc.titleAn experimental investigation of the behavior of Nitinolen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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