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Apparatus and Method for Low-Temperature Training of Shape Memory AlloysAn apparatus and method for the low-temperature thermo-mechanical training of shape memory alloys (SMA) has been developed. The experimental SMA materials are being evaluated as prototypes for applicability in novel thermal management systems for future cryogenic applications. Alloys providing two-way actuation at cryogenic temperatures are the chief target. The mechanical training regimen was focused on the controlled movement of rectangular strips, with S-bend configurations, at temperatures as low as 30 K. The custom holding fixture included temperature sensors and a low heat-leak linear actuator with a magnetic coupling. The fixture was mounted to a Gifford-McMahon cryocooler providing up to 25 W of cooling power at 20 K and housed within a custom vacuum chamber. Operations included both training cycles and verification of shape memory movement. The system design and operation are discussed. Results of the training for select prototype alloys are presented.
Document ID
20150022930
Acquisition Source
Kennedy Space Center
Document Type
Conference Paper
Authors
Swanger, A. M. (NASA Kennedy Space Center Cocoa Beach, FL United States)
Fesmire, J. E. (NASA Kennedy Space Center Cocoa Beach, FL United States)
Trigwell, S. (Sierra Lobo, Inc. Kennedy Space Center, FL, United States)
Gibson, T. L. (Vencore Services and Solutions, Inc. Kennedy Space Center, FL, United States)
Williams, M. K. (NASA Kennedy Space Center Cocoa Beach, FL United States)
Benafan, O. (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
December 11, 2015
Publication Date
June 28, 2015
Subject Category
Metals And Metallic Materials
Mechanical Engineering
Report/Patent Number
KSC-E-DAA-TN23885
Meeting Information
Meeting: Cryogenic Engineering Conference (CEC) and International Cryogenic Materials Conference (ICMC)
Location: Tucson, AZ
Country: United States
Start Date: June 28, 2015
End Date: July 2, 2015
Sponsors: Centennial Conferences
Funding Number(s)
WBS: WBS 295670.01.01.14
CONTRACT_GRANT: NNK11EA08C
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Training
Cryocooler
Shape Memory Alloy

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