“Giant Superelasticity Effect” in Superelastic Materials and Its Applications
Publication: Journal of Materials in Civil Engineering
Volume 18, Issue 6
Abstract
Nitinol superelastic materials (SEM) are mostly used for low-force/large displacements applications involving tensile or bending modes of loading. The paper describes experiments on the radial compression of superelastic wires and tubes between flat loading surfaces. Elastic (recoverable) deformations—up to 22.5% with high damping under loads in the kN/mm range for solid wires, and the 10– range for tubes with an outer diameter of 0.4– —have been observed. The recoverable deformation as great as 60% has been measured on a thin-walled SEM tube. This phenomenon was named a “giant superelasticity effect” (GSE). The experiments were performed in a broad range of loading rates. Stainless-steel specimens were also tested for comparison. A closed-form analysis for thin-wall tubes, and some realized and potential applications of GSE, are described.
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Acknowledgments
Support by the NSF (Grant No. 0218209) and the donation of test specimens by Shape Memory Applications, Inc. and by Nitinol Devices and Components Co. are gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 18 • Issue 6 • December 2006
Pages: 851 - 857
Copyright
© 2006 ASCE.
History
Received: Nov 22, 2004
Accepted: Feb 3, 2006
Published online: Dec 1, 2006
Published in print: Dec 2006
Notes
Note. Associate Editor: John S. Popovics
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