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Proceedings Paper

Deformation behavior of TiNi shape memory alloy under strain- or stress-controlled conditions
Author(s): Hisaaki Tobushi; Kayo Okumura; Masato Endo; Kikuaki Tanaka
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Paper Abstract

The deformation properties of TiNi shape memory alloy subjected to strain control and stress control were investigated experimentally. The result obtained are summarized as follows. In the case of full loop, the stress- strain curves under stress-controlled condition are similar to those under strain-controlled condition with high strain rate. The overshoot and undershoot do not appear at the start points of the stress-induced martensitic transformation in these curves. In the case of subloop under stress-controlled condition, temperature decreases and therefore strain increases owing to the martensitic transformation at the early stage in the unloading process. At the early stage in the reloading process, temperature increase and therefore strain decease owing to the reverse transformation. In the case of subloop under stress- controlled condition, the starting stresses of the martensitic transformation and the reverse transformation in the loading and unloading processes coincide with the transformation stresses under strain-controlled condition with low strain rate, respectively. The deformation behaviors for subloop under stress-controlled condition are prescribed by the condition for progress of the martensitic transformation based on the transformation kinetics. The deformation behaviors subjected to cyclic loading under stress-controlled condition at constant temperature are also prescribed by the condition for progress of the martensitic transformation.

Paper Details

Date Published: 11 July 2002
PDF: 12 pages
Proc. SPIE 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics, (11 July 2002); doi: 10.1117/12.474995
Show Author Affiliations
Hisaaki Tobushi, Aichi Institute of Technology (Japan)
Kayo Okumura, Aichi Institute of Technology (Japan)
Masato Endo, Aichi Institute of Technology (Japan)
Kikuaki Tanaka, Tokyo Metropolitan Institute of Technology (Japan)


Published in SPIE Proceedings Vol. 4699:
Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics
Christopher S. Lynch, Editor(s)

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