External temperature effects on the hysteresis of NiTi wires in dampers for stay-cables
Visualitza/Obre
Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/28376
Tipus de documentText en actes de congrés
Data publicació2014
EditorCentre Internacional de Mètodes Numèrics en Enginyeria (CIMNE)
Condicions d'accésAccés obert
Llevat que s'hi indiqui el contrari, els
continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
:
Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
The 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.
CitacióTorra, 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.
Dipòsit legalB-16310-2014
ISBN978-84-942844-5-8
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
VT_GC_SC_CA_p460.pdf | 1,053Mb | Visualitza/Obre |