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Thermomechanical Characterization of SMA Actuators Under Cyclic Loading

[+] Author Affiliations
Dimitris C. Lagoudas, Pavlin B. Entchev, Parikshith K. Kumar

Texas A&M University, College Station, TX

Paper No. IMECE2003-42933, pp. 211-217; 7 pages
doi:10.1115/IMECE2003-42933
From:
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Aerospace
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Aerospace Division
  • ISBN: 0-7918-3707-6 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME

abstract

Shape memory alloy (SMA) wire actuators have been increasingly used in various devices and applications due to their high energy density and simple design. With the use of these actuators the questions of size effects on their behavior need to be addressed. This paper presents a study on the cyclic loading behavior of large diameter SMA wires subjected to different thermo-mechanical loading paths. Wires of two different diameters are investigated in the current study—1.78 mm and 2.16 mm. The issues addressed in this work include the investigation and design of a gripping technique for the large diameter wires to avoid slippage and study of heat treatment conditions for optimized superelastic behavior. After the heat treatment, specimens are subjected to cyclic mechanical loading. Two different cyclic loading patterns have been investigated: loading up to a given value of stress or up to a given value of strain.

Copyright © 2003 by ASME
Topics: Actuators

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