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RESEARCH PAPERS

Material Characterization of SMA Actuators Under Nonproportional Thermomechanical Loading

[+] Author and Article Information
Zhonghe Bo, Dimitris C. Lagoudas, David Miller

Center for Mechanics of Composites, Aerospace Engineering Department, Texas A&M University, College Station, TX 77843

J. Eng. Mater. Technol 121(1), 75-85 (Jan 01, 1999) (11 pages) doi:10.1115/1.2816003 History: Received February 05, 1998; Revised July 23, 1998; Online November 27, 2007

Abstract

The application of SMA actuators in smart structures usually involves thermally induced phase transformation with a variable applied stress in SMA actuators, resulting in thermomechanical nonproportional loading of SMAs in stress-temperature space. To investigate the constitutive response of SMAs under thermomechanical nonproportional loading, experiments for thermally induced phase transformation of binary NiTi SMA wires loaded by an elastic linear spring are performed in the Active Materials Laboratory at Texas A&M University. A constitutive model developed by Bo and Lagoudas (1998a, b, c) and Lagoudas and Bo (1998) is used as the basis for the theoretical prediction of the response of SMA line actuators loaded by springs with different elastic constants. Model predictions are compared with experimental results.

Copyright © 1999 by The American Society of Mechanical Engineers
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