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Proceedings Paper

A study on the actuation behavior of shape memory alloys under tension-torsion combined loading
Author(s): Jong-Ha Chung; Hyun-Chul Kim; Jung-Ju Lee
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Paper Abstract

Aside from using SMA wires under uniaxial loading as the actuation elements, some researchers have developed a number of models that can simulate multiaxial behavior under tension-torsion combined loading or full three-dimensional loading. But there are many difficulties in identifying the model parameters and applying the model to application. Moreover, most research has focused on tubular materials, although SMA rods have the nonlinear stress distributions through radial direction. In this work, a constitutive model that can describe the pseudoelastic and shape memory behavior of a circular SMA rod is suggested. To describe the material behavior at the transformation region, the plastic flow rule is used and it is assumed that the transformation occurs in accordance with J'2, J'3 combined yield criterion. Brinson's model is used for the martensite transformation kinetics. The boundary layer of the elastic region and the transformation region were assumed to monotonically decrease from the outer radius, and the thermal expansion effect was not considered. Numerical analysis and experiments about pseudoelasticity and shape memory behavior were conducted. It can be seen that the suggested model is in good accord with the experimental results. Because the proposed model has fewer parameters than three-dimensional models or thermomechanical models, it can be easily used for practical engineering purposes.

Paper Details

Date Published: 13 November 2007
PDF: 6 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64230Q (13 November 2007); doi: 10.1117/12.779336
Show Author Affiliations
Jong-Ha Chung, Korea Atomic Energy Research Institute (South Korea)
Hyun-Chul Kim, Korea Advanced Institute of Science and Technology (South Korea)
Jung-Ju Lee, Korea Advanced Institute of Science and Technology (South Korea)

Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering
Shanyi Du; Jinsong Leng; Anand K. Asundi, Editor(s)

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