Thermoelastic properties on Cu-Zn-Al shape memory springs
AUTOR(ES)
Oliveira, Carlos Augusto do Nascimento, Gonzalez, Cezar Henrique, Araújo, Carlos José de, Araújo Filho, Oscar Olímpio de, Urtiga Filho, Severino Leopoldino
FONTE
Materials Research
DATA DE PUBLICAÇÃO
2010-06
RESUMO
This paper present a thermomechanical study of actuators in form of helical springs made from shape memory alloy wires that can work as actuator and/or as sensor. These abilities are due to the martensitic transformation. This transformation is a diffusionless phase transition that occurs by a cooperative atomic rearrange mechanism. In this work, helical spring actuators were manufactured from Cu-Zn-Al shape memory alloy wires. The springs were submitted to constant tensile loads and thermal cycles. This procedure allows to determine thermoelastic properties of the shape memory springs. Thermomechanical properties were analyzed during 50 thermal cycles in the temperature range from 20 to 130 °C. Results of variations in critical transformation temperatures, thermoelastic strain and thermal hysteresis are discussed based on defects rearrangement and martensitic transformation theory.
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