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On the Shortcomings of Shape Memory Alloy Phenomenological Models

[+] Author Affiliations
Mohammad H. Elahinia

University of Toledo

Mehdi Ahmadian

Virginia Polytechnic Institute and State University

Paper No. IMECE2004-61169, pp. 123-134; 12 pages
  • ASME 2004 International Mechanical Engineering Congress and Exposition
  • Aerospace
  • Anaheim, California, USA, November 13 – 19, 2004
  • Conference Sponsors: Aerospace Division
  • ISBN: 0-7918-4700-4 | eISBN: 0-7918-4178-2, 0-7918-4179-0, 0-7918-4180-4
  • Copyright © 2004 by ASME


The phenomenological models for SMAs, consisting of a thermodynamics based- constitutive and a phase transformation kinetics model, are the most widely used models for engineering applications. The existing phenomenological models are able to predict the behavior of SMA-actuated systems in most cases, except for cases arising from a simultaneous change in temperature and stress of the SMA elements, as is documented in this study. For such cases, the existing models fail to adequately predict the behavior of SMA elements undergoing complex thermomechanical loadings. A rotary SMA-actuated robotic arm is modeled using the existing constitutive models, in order to document the conditions under which the models fail. The model is verified against the experimental results, to document that under certain conditions, the model is not able to predict the behavior of the SMA-actuated manipulator. The phenomenological models discrepancy is also studied experimentally using a dead-weight that is actuated by an SMA wire.

Copyright © 2004 by ASME



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