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Advances in Materials Science and Engineering
Volume 2013, Article ID 823594, 7 pages
http://dx.doi.org/10.1155/2013/823594
Research Article

Characteristics Analysis and Testing of SMA Spring Actuator

1College of Mechanical Engineering, Chongqing Industry Polytechnic College, Chongqing 401120, China
2The Key Laboratory of Manufacture and Test Techniques for Automobile Parts, Chongqing University of Technology, Chongqing 400054, China

Received 19 July 2013; Accepted 8 September 2013

Academic Editor: Xing Chen

Copyright © 2013 Jianzuo Ma et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The biasing form two-way shape memory alloy (SMA) actuator composed of SMA spring and steel spring is analyzed. Based on the force equilibrium equation, the relationship between load capacity of SMA spring and geometric parameters is established. In order to obtain the characteristics of SMA spring actuator, the output force and output displacement of SMA spring under different temperatures are analyzed by the theoretical model and the experimental method. Based on the shape memory effect of SMA, the relationship of the SMA spring actuator's output displacement with the temperature, the stress and strain, the material parameters, and the size parameters is established. The results indicate that the trend of theoretical results is basically consistent with the experimental data. The output displacement of SMA spring actuator is increased with the increasing temperature.