Mr. Aaron P. Stebner Profile

Aaron P. Stebner

at NASA Glenn Research Ctr

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Proceedings Article | 18 April 2008 Paper

Characterization of Ni19.5Ti50.5Pd25Pt5 high-temperature shape memory alloy springs and their potential applications in aeronautics

Aaron Stebner, Santo Padula II, Ronald Noebe, D. Dane Quinn

Proceedings Volume 6928, 69280X (2008) https://doi.org/10.1117/12.775805

KEYWORDS: Actuators, Shape memory alloys, Control systems, Aerospace engineering, Platinum, Palladium, Prototyping, 3D modeling, Heat treatments, Temperature metrology

Read Abstract +

Shape memory alloys (SMAs) have been used as actuators in many different industries since the discovery of the shape memory effect, but the use of SMAs as actuation devices in aeronautics has been limited due to the temperature constraints of commercially available materials. Consequently, work is being done at NASA's Glenn Research Center to develop new SMAs capable of being used in high temperature environments. One of the more promising high-temperature shape memory alloys (HTSMAs) is Ni_19.5Ti_50.5Pd₂₅Pt₅. Recent work has shown that this material is capable of being used in operating environments of up to 250°C. This material has been shown to have very useful actuation capabilities, demonstrating repeatable strain recoveries up to 2.5% in the presence of an externally applied load. Based on these findings, further work has been initiated to explore potential applications and alternative forms of this alloy, such as springs. Thus, characterization of Ni_19.5Ti_50.5Pd₂₅Pt₅ springs, including their mechanical response and how variations in this response correlate to changes in geometric parameters, are discussed. The effects of loading history, or training, on spring behavior were also investigated. A comparison of the springs with wire actuators is made and the benefits of using one actuator form as opposed to the other discussed. These findings are used to discuss design considerations for a surge-control mechanism that could be used in the centrifugal compressor of a T-700 helicopter engine.

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