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Title:	Behavior of NiTi wires for dampers and actuators in extreme conditions
Author:	Isalgué Buxeda, Antonio; Auguet Sangrá, Carlota E.; Grau, R.; Torra Ferré, Vicenç; Cinca i Luis, Núria; Fernández, J.
Other authors:	Universitat Politècnica de Catalunya. Departament de Física; Universitat Politècnica de Catalunya. Departament de Física Aplicada; Universitat Politècnica de Catalunya. AIEM - Arquitectura, energia i medi ambient; Universitat Politècnica de Catalunya. BIOCOM-SC - Grup de Biologia Computacional i Sistemes Complexos
Abstract:	Shape 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 recovery induced from temperature changes) and as dampers (because of hysteresis). NiTi wires for dampers in Civil Engineering had been characterized and tested in facilities. Guaranteed performance needs to know behavior during fatigue life and knowledge of effects in the event of extreme conditions, as eventual overstraining. In this work, we check the possibilities to absorb mechanical energy on the fatigue life depending on stress level and explore the consequences of overstraining the material during installation, the possibilities of partial healing by moderate heating, and some effects of over-stressing the wires. The mechanical energy absorbed by the unit weight of damper wire might be very high during its lifetime if maximum stresses remain relatively low allowing high fatigue life. We show also some results on NiTi wire working as an actuator. The lifetime mechanical work performed by an actuator wire can be very high if applied stresses are limited. The overstraining produces relevant
Abstract:	Peer Reviewed
Subject(s):	-Àrees temàtiques de la UPC::Física::Física de fluids -Shape memory alloys -Smart materials -creep and stress rupture -failure analysis -inter-metallics -mechanical -NiTi -shape memory alloys -thermo-mechanical processing -MARTENSITIC-TRANSFORMATION -FATIGUE -SMA -STRESS -ALLOY -LIFE -Aliatges amb memòria de forma -Materials intel·ligents
Rights:	http://creativecommons.org/licenses/by-nc-nd/3.0/es/
Document type:	Article - Submitted version Article
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