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dc.contributor.authorTorra Ferré, Vicenç
dc.contributor.authorCarreras, Guillem
dc.contributor.authorCasciati, Sara
dc.contributor.authorAuguet Sangrá, Carlota E.
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física Aplicada
dc.identifier.citationTorra, V. [et al.]. External temperature effects on the hysteresis of NiTi wires in dampers for stay-cables. A: World Conference on Structural Control and Monitoring. "Proceedings of the 6th World Conference on Structural Control and Monitoring: 6WCSCM". Barcelona: Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2014, p. 460-468.
dc.description.abstractThe use of NiTi wires, one of the Shape Memory Alloy (SMA) materials that permits efficient damping in stayed cables for bridges, requires an appropriate behavior when exposed to the external temperature effects. The Clausius-Clapeyron thermodynamic equation establishes a shift of the hysteretic cycle in the stress-temperature representation of about 6 MPa/K for the used wires of diameter 2.46 mm. Hence, an adequate experimental study is necessary to characterize the temperature effects in working conditions. The conducted analysis is twofold. First, the practical evolution of the hysteresis cycle is investigated. The results suggest that the wire permits a completely satisfactory use for temperatures as low as 253 K (i.e., -20 oC). Second, the focus is placed on the effects of extreme winter actions (i.e., as low as 233 K or -40 oC). A preliminary stress aging process at 373K seems adequate to this requirement. Indeed, after the stress aging, the SMA wire increases their working domain by 300 or 400 MPa and the temperature domain is expanded by 30 – 50 K. Measurements visualizing recoverable dynamical actions in the SMA alloys are also outlined.
dc.format.extent9 p.
dc.publisherCentre Internacional de Mètodes Numèrics en Enginyeria (CIMNE)
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.subjectÀrees temàtiques de la UPC::Enginyeria dels materials::Assaig de materials
dc.subjectÀrees temàtiques de la UPC::Matemàtiques i estadística::Equacions diferencials i integrals
dc.subject.lcshEquations of state
dc.subject.otherstress aging
dc.titleExternal temperature effects on the hysteresis of NiTi wires in dampers for stay-cables
dc.typeConference report
dc.subject.lemacEquacions d'estat
dc.contributor.groupUniversitat Politècnica de Catalunya. BIOCOM-SC - Grup de Biologia Computacional i Sistemes Complexos
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
local.citation.authorTorra, V.; Carreras, G.; Casciati, S.; Auguet, C.
local.citation.contributorWorld Conference on Structural Control and Monitoring
local.citation.publicationNameProceedings of the 6th World Conference on Structural Control and Monitoring: 6WCSCM

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