Electro-thermomechanical characterization of Ti-Ni shape memory alloy thin wires

The use of shape memory alloys (SMA) as smart structures and other modern applications require a previous evaluation of its performance under load as well as a training procedure. In general, these requirements lead to the design and assembly of a specific test bench. In this work, an experimental s...

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Published inMaterials research (São Carlos, São Paulo, Brazil) Vol. 9; no. 1; pp. 15 - 19
Main Authors Nascimento, Maria Marony Sousa Farias, Araújo, Carlos José de, Rocha Neto, José Sérgio da, Lima, Antonio Marcus Nogueira de
Format Journal Article
LanguageEnglish
Published ABM, ABC, ABPol 01.03.2006
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
Subjects
ENGINEERING, CHEMICAL
MATERIALS SCIENCE, MULTIDISCIPLINARY
METALLURGY & METALLURGICAL ENGINEERING
shape memory alloys
smart materials
thermomechanical behavior
Ti-Ni alloys
shape memory alloys
Ti-Ni alloys
smart materials
thermomechanical behavior
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Summary:The use of shape memory alloys (SMA) as smart structures and other modern applications require a previous evaluation of its performance under load as well as a training procedure. In general, these requirements lead to the design and assembly of a specific test bench. In this work, an experimental set-up was specially designed to perform the electro-thermomechanical characterization of SMA wires. This apparatus was used to determine the strain-temperature (epsilon - T) and electrical resistance-temperature (R - T) hysteretic characteristics curves of a Ti-Ni shape memory wire (90 mm in length and 150 µm in diameter) under mechanical load. The SMA wire is loaded by means of constant weights and a controlled system for injection of electrical power allows performing the heating-cooling cycles. The obtained hysteretic epsilon - T and R - T characteristics curves for some levels of applied loads are used to determine important shape memory parameters, like martensitic transformation temperatures, temperature hysteresis, temperature slopes and shape memory effect under load. These parameters were in accord with the ones found in literature for the studied SMA wires.
ISSN:1516-1439
1980-5373
1516-1439
DOI:10.1590/S1516-14392006000100004