Constitutive model for shape memory alloy torsion actuator

ZHOU Bo^1,2, LENG Jin-song², ZOU Guang-ping¹, LIU Yan-ju³, ZHOU Li-min⁴

1.College of Civil Engineering,Harbin Engineering University,Harbin 150001,China;2.Center for Composite Materials and Structures,Harbin Institute of Technology,Harbin 150080,China;3.Dept. of Aerospace Science and Mechanics,Harbin Institute of Technology,Harbin 150001,China;4.Dept. of Mechanical Engineering,The Hong Kong Polytechnic University,Hong Kong,China



Abstract:

Shape memory alloy (SMA) torsion actuator is one of the key approaches realizing adaptive wings in airplanes. In this paper,the actuator is made up of SMA wires and a thin-walled tube,in which the SMA wires are twisted and affixed around the surface of the tube at an angle referenced to the center axis of the tube. A thermo-mechanical constitutive model is developed to predict the thermo-mechanical behaviors of the SMA torsion actuator based on the knowledge of solid mechanics. The relationship between the torsion-angle and tem- perature is numerically calculated by using the thermo-mechanical constitutive model coupled with the SMA phase transformation model developed by Zhou and Yoon. The numerical results are compared with the relative experimental results finished by Xiong and Shen. Influences of the twist-angle of SMA wires and geometrical factors on the primary actuation performances of the SMA torsion actuator are also numerically investigated based on the thermo-mechanical constitutive model coupled with the SMA phase transformation model developed by Zhou and Yoon. Results show that the thermo-mechanical constitutive model can well predict the thermo-mechanical behaviors of the SMA torsion actuator.

Key words:  shape memory alloy  torsion actuator  thermo-mechanical constitutive model

DOI£º10.11916/j.issn.1005-9113.2010.02.024

Clc Number:V259

Fund: