Shape‐Memory Alloys as New Materials for Aseismic Isolation
Publication: Journal of Engineering Mechanics
Volume 117, Issue 11
Abstract
New results are presented in the area of hysteretic modeling and experimental characterization of shape memory alloys (SMAs). A stress‐induced micromechanical phase transition occurs in SMAs that causes inelastic deformation and gives rise to a large energy‐absorbing capacity. Because it is possible to achieve large hysteretic deformation in SMAs without incurring plastic deformation, SMAs have potential for use in earthquake‐engineering passive damping schemes. In order to represent such energy‐absorbing behavior, an existing one‐dimensional model of hysteresis is modified to include the macroscopic characteristics of SMAs. Also, the results of cyclic material‐characterization tests applied to a nickel‐titanium SMA known as Nitinol are presented. Hysteretic behavior closely resembling that of the superelastic material was obtained in the laboratory for cyclic strain levels up to 4.5%. The model of SMA behavior is also compared to the cyclic responses of Nitinol.
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Published In
Journal of Engineering Mechanics
Volume 117 • Issue 11 • November 1991
Pages: 2590 - 2608
Copyright
Copyright © 1991 ASCE.
History
Published online: Nov 1, 1991
Published in print: Nov 1991
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