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Development, Characterization, and Design Considerations of Ni_19.5Ti_50.5 Pd₂₅Pt₅ High-temperature Shape Memory Alloy Helical Actuators

Department of Mechanical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL USA 60208, a-stebner{at}u.northwestern.edu

Santo Padula, III

NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH USA 44135

Ronald Noebe

NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH USA 44135

Bradley Lerch

NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH USA 44135

Dane Quinn

Department of Mechanical Engineering, Auburn Science and Engineering Center, The University of Akron Akron, OH USA 44325-3903

Shape memory alloys (SMAs) have been used in various applications since their discovery. However, their use as actuation devices in high-temperature environments has been limited due to the temperature constraints of commercially available materials. Recently, SMAs that produce good work characteristics at elevated temperatures have been developed at NASA’s Glenn Research Center. One such alloy, Ni_19.5Ti_50.5Pd₂₅Pt ₅, has shown repeatable strain recovery on the order of 2.5% in the presence of an externally applied stress at temperatures greater than 250°C. Based on these findings, potential applications for this alloy are being explored and further work is being done to assess the use of this alloy in various structural forms. In this article, the characterization of Ni _19.5Ti_50.5Pd₂₅Pt₅ helical actuators is reported, including their mechanical responses and how variations in their responses correlate to changes in geometric parameters and training loads. Finally, implementation of previously published SMA spring design methodology in future SMA helical actuator development is considered through comparison of the observed and predicted responses.

Key Words: shape memory alloy • shape memory spring • helical actuator • high temperature • shape memory effect • thermal actuator • NiTiPdPt • NiTi.

This version was published on November 1, 2009

Journal of Intelligent Material Systems and Structures, Vol. 20, No. 17, 2107-2126 (2009)
DOI: 10.1177/1045389X09347018


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