The performance of nitinol shape memory alloy actuators embedded in thermoplastic composite material systems

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dc.contributor.authorPaine, Jeffrey S.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:47:13Zen
dc.date.adate2009-10-10en
dc.date.available2014-03-14T21:47:13Zen
dc.date.issued1991en
dc.date.rdate2009-10-10en
dc.date.sdate2009-10-10en
dc.description.abstractIntelligent materials are a class of material systems usually consisting of a composite or hybrid material system with fibrous or distributed actuators, various sensors and a control system. One type of actuator being developed for intelligent material systems is made of nitinol or shape memory alloy wire. In order for nitinol and other actuators to be a reliable part of the system, the effect of composite manufacturing on the actuators’ performance and behavior must be determined. The results of a study investigating the effects of a "high temperature" thermoplastic composite processing cycle on the nitinol actuator’s performance is presented. A study of the interfacial strength between the actuators and APC-2 thermoplastic composite is also reported. The nitinol actuators were exposed to high temperature (400°C) composite processing cycles. Critical parameters of the processing cycles were varied to determine their effect on the actuators’ performance. After the processing cycles, the nitinol actuators demonstrated useable recovery stresses (σ<sub>r</sub><sup>u</sup>) of 173-265 MPa. The σ<sub>r</sub><sup>u</sup> of a nitinol actuator in the virgin state, subjected to a thermoset processing cycle, and embedded in a specimen of APC-2 thermoplastic composite was also tested to develop a basis for comparison. The quality of the actuator-composite interface bond was tested by pull-out testing and fatigue loading to determine if the actuator is adequately bonded with the host composite. Pull-out forces of 30-50 N could fracture the actuator-composite interface, but 1000 activation cycles of the actuator produced no damage in the bond between actuator and host composite.en
dc.description.degreeMaster of Scienceen
dc.format.extentxvi, 156 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10102009-020117en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10102009-020117/en
dc.identifier.urihttp://hdl.handle.net/10919/45109en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1991.P356.pdfen
dc.relation.isformatofOCLC# 24041590en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1991.P356en
dc.subject.lcshActuators -- Researchen
dc.subject.lcshComposite materials -- Researchen
dc.titleThe performance of nitinol shape memory alloy actuators embedded in thermoplastic composite material systemsen
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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