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Proceedings Paper

Macroscopic constitutive model of shape memory alloys for partial transformation cycles
Author(s): Tadashige Ikeda; Florin Andrei Nae; Yuji Matsuzaki
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Paper Abstract

A simple yet accurate specimen-based macroscopic constitutive model of shape memory alloys (SMA) was derived from a grain-based micromechanical model, to understand the complicated thermo-mechanical behavior of SMA and to design structural elements with SMA components optimally. This model was composed of a phase transformation energy criterion, a strain equation, and a heat and energy flow equation. New features are that (1) a partial transformation cycle model was proposed, which is called the shift-skip model, and that (2) required energy for phase transformation was found to be well approximated by a sum of two exponential functions in terms of martensite volume fraction. In the shift-skip model, the energy required for the partial transformation was obtained by shifting and skipping the energy required for the complete transformation, based on a microscopic transformation rule. Comparison of the calculated stress-strain loops for the complete and partial transformation cycles with experimental data and with other often used models was carried out. Result showed that the proposed model could capture the measured stress-strain loops well and much better than the other models.

Paper Details

Date Published: 26 July 2004
PDF: 10 pages
Proc. SPIE 5383, Smart Structures and Materials 2004: Modeling, Signal Processing, and Control, (26 July 2004); doi: 10.1117/12.539463
Show Author Affiliations
Tadashige Ikeda, Nagoya Univ. (Japan)
Florin Andrei Nae, Nagoya Univ. (Japan)
Yuji Matsuzaki, Nagoya Univ. (Japan)


Published in SPIE Proceedings Vol. 5383:
Smart Structures and Materials 2004: Modeling, Signal Processing, and Control
Ralph C. Smith, Editor(s)

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