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Processing and Characterization for Implementation of Ni-Ti SMA Bending Actuators

[+] Author Affiliations
David A. Miller, Chantz Denowh

Montana State University, Bozeman, MT

Paper No. IMECE2010-38716, pp. 431-437; 7 pages
doi:10.1115/IMECE2010-38716
From:
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 9: Mechanics of Solids, Structures and Fluids
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4446-5
  • Copyright © 2010 by ASME

abstract

This project is based on the predicated growth in the demand for high force/displacement NiTi SMA actuators and structural components for industrial and aerospace applications. As the use of SMAs has advanced, focus has shifted from intrinsic material behavior to identifying the influence of conditioning and processing of NiTi SMAs for actuators and structural components. While the uniaxial actuation of NiTi SMAs is rather mature, little data is available on their potential use as bending actuators. The difficulty encountered in thermomechanical conditioning of a NiTi SMA under an applied bending moment is the asymmetry of the tensile and compressive response, thus creating a shifting neutral axis. In this study, the uniaxial characteristics of 55 NiTi (49.9 at% Ni ∼50.1 at% Ti) are used to develop a process to maximize the actuation strain of a NiTi SMA bending actuator. The characterization includes monotonic tension/compression tests, tension/compression training, tension/compression actuation strains, and transformation temperatures. From these results, the most efficient thermomechanical training method for bending is identified as a cyclic temperature induced phase transformation under a constant flexural stress. The resulting actuation strains and deformation conditions are discussed in light of the complex loading path created by the bending stress. Predicted outcomes of the training methodology are made for comparison to future experimental results.

Copyright © 2010 by ASME
Topics: Actuators

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