Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


akron1194994008.pdf (3.4 MB)

ETD Abstract Container

Abstract Header

Development, Characterization, and Application of Ni19.5Ti50.5Pd25Pt5 High-Temperature Shape Memory Alloy Helical Actuators

Stebner, Aaron P.
http://rave.ohiolink.edu/etdc/view?acc_num=akron1194994008

Abstract Details

2007, Master of Science, University of Akron, Mechanical Engineering.
Shape memory alloys (SMAs) have been used as actuators in many different industries since the discovery of the shape memory effect. These include, but are not limited to, applications in the automobile industry, medical devices, commercial plumbing, and robotics. 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 Ni19.5Ti50.5Pd25Pt5. Recent work has shown that this material is capable of being used in operating environments of up to 250°C. This material has also 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 Ni19.5Ti50.5Pd25Pt5 springs, including their mechanical response (e.g. stroke capabilities, load carrying capabilities, and work outputs) and how variations in this response correlate to changes in geometric parameters (e. g. wire diameter, coil diameter, wire-to-coil diameter ratio, and number of coils) 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 used in the centrifugal compressor of a T-700 helicopter engine. The mechanical response observed during testing is then compared with responses predicted using current SMA spring design methodology. The deficiencies in predictions using this current design methodology are discussed in terms of future work needed to develop a model for HTSMA springs that can accurately guide engineering design.
D. Quinn (Advisor)
98 p.
Engineering, Aerospace
Shape Memory Alloy; Shape Memory Alloy Spring; SMA; High Temperature Shape Memory Alloy; High Temperature Shape Memory Alloy Spring; HTSMA; Spring; Helical Actuator; Adaptive Structure; Active Structure; Flight Structure; Actuator; Actuation Device

Recommended Citations

Citations

  • Stebner, A. P. (2007). Development, Characterization, and Application of Ni19.5Ti50.5Pd25Pt5 High-Temperature Shape Memory Alloy Helical Actuators [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1194994008

    APA Style (7th edition)

  • Stebner, Aaron. Development, Characterization, and Application of Ni19.5Ti50.5Pd25Pt5 High-Temperature Shape Memory Alloy Helical Actuators. 2007. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1194994008.

    MLA Style (8th edition)

  • Stebner, Aaron. "Development, Characterization, and Application of Ni19.5Ti50.5Pd25Pt5 High-Temperature Shape Memory Alloy Helical Actuators." Master's thesis, University of Akron, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1194994008

    Chicago Manual of Style (17th edition)

akron1194994008
1,584
© 2007, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.