Browsing by Author "Torra Ferré, Vicenç"
Now showing items 1-19 of 19
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Behavior of NiTi wires for dampers and actuators in extreme conditions
(2015-09-01)
Article
Open AccessShape memory alloys are considered smart materials because of their singular thermo-mechanical properties, due to a thermoelastic martensitic transformation, enabling possible uses as actuators (because of mechanical ... -
Built in dampers for stayed cables in bridges via SMA. The SMARTeR-ESF project: a mesoscopic and macroscopic experimental analysis with numerical simulations
(Elsevier, 2013-04)
Article
Open AccessShape Memory Alloys (SMAs) are good candidates for solid-state dampers appropriate for the oscillations of bridge stay cables because of their large recoverable strain, hysteresis and reasonable fatigue-life. This work ... -
Caracteristiques des calorimètres par conduction: traitement mathématique des modèles
(Escola Tècnica Superior d'Enginyers Industrials de Barcelona, 1980-05)
Article
Open Access -
Comment on “Effects of heat-flux features on the differential scanning calorimetry curve of a thermoelastic martensitic transformation” by Benke et al. [Mater. Sci. Eng. A 481–482 (2008) 522]
(2010-04-15)
Article
Restricted access - publisher's policyThe martensitic transformation of a Cu–Zn–Al single crystal was measured in a differential scanning calorimeter at different heating rates. The curves were analyzed in order to detect the initial and final temperatures of ... -
Effects of strain aging in NiTi SMA wire for dampers
(Elsevier, 2015)
Article
Open AccessThe thermo-mechanical properties of Shape Memory Alloys (SMA) as smart materials suggest their application as actuators, but also as dampers, thanks to the high damping properties during the hysteresis of the thermo-elastic ... -
Experimental study of damping in civil engineering structures using smart materials (CuAlBe - SMA): an application to a steel portico
(2010)
Article
Restricted access - publisher's policyThe target of the paper focuses in the required properties for successful behavior of the CuAlBe Shape Memory Alloy (SMA) in damping of steel structures under the action of earthquakes. The appropriate fracture – life, the ... -
Experimental study of damping in civil engineering structures using smart materials (NiTi - SMA): application to stayed cables for bridges
(2010)
Article
Restricted access - publisher's policyExperimental study of damping in civil engineering structures was done using smart materials (NiTi SMA). The study is focused on the stayed cables for bridges. The cable oscillations are induced by wind, rain or traffic. ... -
External temperature effects on the hysteresis of NiTi wires in dampers for stay-cables
(Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2014)
Conference report
Open AccessThe 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 ... -
On the learning of weights in some aggregation operators: the weighted mean and OWA operators
(Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1999)
Article
Open AccessWe study the determination of weights for two types of aggregation operators: the weighted mean and the OWA operator. We assume that there is at our disposal a set of examples for which the outcome of the aggregation ... -
Pre-stressed NiTi: effects of the thermodynamic forces and time
(2008-11-30)
Conference lecture
Restricted access - publisher's policyThe use of NiTi in damping devices for Civil Engineering requires stable behavior of the stress-strain curves with time and cycling. In particular, the use of pre-stressed samples improves the damping efficiency. Since ... -
Sedàs: a semantic based general classifier system
(Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1997)
Article
Open AccessIn this work we present the general classifier system Sedàs. We show how this system implements the description of the domain and how it builds similarity matrices and classification trees. The system uses a new ... -
Shape memory alloys as an effective tool to damp oscillations: study of the fundamental parameters required to guarantee technological applications
(2015-03-01)
Article
Open AccessThe SMA was studied for their macroscopic application in damping for civil engineering. The study is a synthesis and includes an outline of the models required for the SMA simulation and some case studies using the finite ... -
SMA (cu-based, niti) for use in damping: the implications of reliability for long time applications and aging behavior
(2011)
Conference report
Open Access -
SMA in mitigation of extreme loads in civil engineering: damping actions in stayed cables
(Trans Tech Publications, 2011-10-27)
Article
Open AccessGuaranteeing the use of Shape Memory Alloys (SMA) in mitigation of extreme load effects requires a deep study of the SMA behavior according to the specific requirements of the application. In particular, for a storm is ... -
SMA in mitigation of extreme loads in civil engineering: study of their application in a realistic steel portico
(Trans Tech Publications, 2011-10)
Article
Open AccessGuaranteeing the use of Shape Memory Alloys (SMA) in mitigation of extreme load effects requires a deep study of the SMA behavior according to the specific requirements of the applications in damping. The damper was defined ... -
Synthesis of membership functions to determine a radius of influence
(Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1995)
Article
Open AccessIn this work we study the synthesis of membership functions when they have been calculated from a set of observations according to the definition of (Zhang, 1993). The results obtained have been used to determine the radius ... -
The SMA properties in civil engineering applications. The SMARTeR project: use of SMA in damping of stayed cables for bridges
(2009-09)
Conference lecture
Open AccessAbstract. One of the classical applications of the SMA is based on the used of the hysteresis cycle associated to the martensitic transformation (classically, described as a first order phase transition) for damping ... -
The SMA: an effective damper in civil engineering that smoothes oscillations
(Universitat Politècnica de Catalunya. Escola Tècnica Superior d'Enginyers de Camins Canals i Ports de Barcelona, 2011-11-16)
Conference lecture
Open AccessThe properties of SMA (Shape Memory Alloys, that are smart materials) are associated to a first order phase transition named martensitic transformation that occurs between metastable phases: austenite and martensite. At ... -
The SMA: an effective damper in civil engineering that smoothes oscillations
(2012)
Article
Restricted access - publisher's policyThe properties of SMA (Shape Memory Alloys, smart materials) are associated to a first order phase transition named martensitic transformation that occurs between metastable phases: austenite and martensite. At higher ...
