Characterization of a shape memory alloy interference coupling
Loading...
Authors
Crane, William M.
Newman, James H.
Romano, Marcello
Subjects
Advisors
Date of Issue
2014
Date
Publisher
Language
Abstract
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).
Type
Article
Description
The article of record may be found at http://iopscience.iop.org/article/10.1088/0964-1726/23/11/115011
Series/Report No
Department
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Naval Postgraduate School
Format
Citation
Crane, William M., James H. Newman, and Marcello Romano. "Characterization of a shape memory alloy interference coupling." Smart Materials and Structures 23.11 (2014): 115011.
Distribution Statement
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.