TY - JOUR
T1 - Electro-thermomechanical characterization of Ti-Ni shape memory alloy thin wires
AU - Nascimento, Maria Marony Sousa Farias
AU - de Araújo, Carlos José
AU - da Rocha Neto, José Sérgio
AU - de Lima, Antonio Marcus Nogueira
PY - 2006
Y1 - 2006
N2 - 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 (ε - T) and electrical resistance-temperature (R - T) hysteretic characteristics curves of a Ti-Ni shape memory wire (90 mm in length and 150 μ 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 ε - 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.
AB - 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 (ε - T) and electrical resistance-temperature (R - T) hysteretic characteristics curves of a Ti-Ni shape memory wire (90 mm in length and 150 μ 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 ε - 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.
KW - Shape memory alloys
KW - Smart materials
KW - Thermomechanical behavior
KW - Ti-Ni alloys
UR - http://www.scopus.com/inward/record.url?scp=33645839595&partnerID=8YFLogxK
U2 - 10.1590/S1516-14392006000100004
DO - 10.1590/S1516-14392006000100004
M3 - Article
AN - SCOPUS:33645839595
SN - 1516-1439
VL - 9
SP - 15
EP - 19
JO - Materials Research
JF - Materials Research
IS - 1
ER -