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Proceedings Paper

Modeling of two-way shape-memory effect based on phase interaction energy function
Author(s): Hisashi Naito; Junpei Sato; Yuji Matsuzaki
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Paper Abstract

We present an analysis on a complicated combined process of martenistic transformation and two-way shape memory effect due to cyclic loadings of stress and heat in order to further develop the constitutive model of an SMA wire which is based on the phase interaction energy function proposed in our previous studies. Stress-induced martenistic transformation is modeled by introducing residual martensite in the transformation process between austenite and detwinned martensite. As for heat-induced two-way shape memory effect, it is assumed that a mixed-state of austenite and residual detweinned martensite changes into another mixed-state of twinned and detwinned martensites during colling of the alloy, whereas a reversal change between the mixed-states occurs during heating. To examine the effectiveness of this analytical model based on the phase interaction energy function, an experiment is performed using a uniform SMA wire. Numerical analysis is carried out to compare with experimental data on the stress-induced martensitic transformation and the heat-induced two-way shape memory effect, which reveal very complicated training effect.

Paper Details

Date Published: 21 July 2004
PDF: 12 pages
Proc. SPIE 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics, (21 July 2004); doi: 10.1117/12.538353
Show Author Affiliations
Hisashi Naito, National Rehabilitation Ctr. for Persons with Disabilities (Japan)
Junpei Sato, Nagoya Univ. (Japan)
Yuji Matsuzaki, Nagoya Univ. (Japan)

Published in SPIE Proceedings Vol. 5387:
Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics
Dimitris C. Lagoudas, Editor(s)

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