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Proceedings Paper

Design of ferromagnetic shape memory alloy composites based on TiNi for robust and fast actuators
Author(s): Yasuhiro Matsunaga; Tetsuya Tagawa; Taishi Wada; Minoru Taya
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Paper Abstract

Recently, ferromagnetic shape memory alloys (FSMAs) attracted strong attentions due to their fast actuation with relatively large strain. However, the mechanical properties of popular ferromagnetic shape memory alloys are found to be lower than TiNi alloys. A TiNi has high mechanical performances, large transformation strain and stress capability. On the other hand, the speed of TiNi alloys actuated by changing temperature is usually slow. Thus use of a ferromagnetic material is attractive in utilizing it for induction of magnetic force at high speed. If we combine both merits of TiNi and ferromagnetic material, we can design a new ferromagnetic SMA composite. The actuation modes examined here are plate bending and bar torsion, where the stress and strain across thickness direction change linearly with position. The outer layers that are subject to the larger strain are the superelastic TiNi, which sandwich the inner layer of a ferromagnetic material. The force activated in the ferromagnetic layer from the applied magnetic field causes the phase change in the superelastic TiNi layer, i.e. from austenite to martensite, thus the softening of stiffness of TiNi leads to large displacement.

Paper Details

Date Published: 11 July 2002
PDF: 10 pages
Proc. SPIE 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics, (11 July 2002); doi: 10.1117/12.474973
Show Author Affiliations
Yasuhiro Matsunaga, Shixuoka Univ. (Japan)
Tetsuya Tagawa, Univ. of Washington (United States)
Taishi Wada, Univ. of Washington (United States)
Minoru Taya, Univ. of Washington (United States)

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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