Characterization of a shape memory alloy interference coupling
Crane, William M.
Newman, James H.
MetadataShow full item record
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).
The article of record may be found at http://iopscience.iop.org/article/10.1088/0964-1726/23/11/115011
Showing items related by title, author, creator and subject.
Olson, Darren Montgomery (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 ...
Han, Hwang-Jin. (Monterey, California. Naval Postgraduate School, 1989);The hollow cathode is an effective source of dense, low energy plasma. Hollow cathodes find use in ion beam sources for laboratory and space applications. They can also be used independently for satellite charge control, ...
Braley, Calvin J. (Monterey, California. Naval Postgraduate School, 1995-03);This thesis examines the trends in the enlisted force structure utilizing the Years of Active Federal Service (YAFS) Report for fiscal years 1975 through 1994. The YAFS report, an annual matrix representing all nine enlisted ...