Characterization of a shape memory alloy interference coupling
MR31_Crane_SmartMaterials.pdf (951.9Kb)Date
2014Metadata
Show full item recordAbstract
A versatile and heretofore unutilized coupling is obtained by press-fitting a hollow nickel titanium shape memory alloy (SMA) shaft into a steel hub. This produces an SMA interference coupling that is distinct from other SMA actuators by the method in which the SMA is used. Press-fitting the hollow SMA shaft in its detwinned martensitic phase into a steel hub creates a joint capable of holding parts such as emergency doors, satellite solar panels, or tamper locks securely together until commanded release. Release is accomplished by heating the SMA to its activation temperature. The resulting decrease in diameter of the hollow SMA shaft allows it to easily slip out of the hub, releasing the part. Load testing of the SMA interference coupling showed ultimate strengths about twice that of traditional press-fit coupling strength calculations. The coupling can be designed to be a simple mechanism of very small size, on the order of one cubic centimeter, capable of achieving coupling strengths in excess of 4000 N (900 lbf).
Description
The article of record may be found at http://iopscience.iop.org/article/10.1088/0964-1726/23/11/115011
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
Related items
Showing items related by title, author, creator and subject.
-
Radar observations of field-aligned plasma propagations associated with NASA's PMG experiment
(Monterey, California. Naval Postgraduate School, 1994-09);ASA's Plasma Motor Generator (PMG) tethered satellite mission was launched in June 1993 to verify the ability of hollow cathode plasma sources to couple electric currents from an electrodynamic tether into the ambient ... -
ADDITIVE MANUFACTURING HOLLOW METAL PARTS WITH LIQUID METAL
(Monterey, CA; Naval Postgraduate School, 2022-06);Liquid-metal additive manufacturing is a new technology whose limits have not been fully tested. Unique molten-metal droplet printing allows for new metal structures to be made that cannot be built with traditional ... -
Enhanced acoustic mode coupling resulting from an internal solitary wave approaching the shelfbreak in the South China Sea
(Acoustical Society of America, 2013-03);Internal waves and bathymetric variation create time- and space-dependent alterations in the ocean acoustic waveguide, and cause subsequent coupling of acoustic energy between propagating normal modes. In this paper, the ...
