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Proceedings Paper

Low spring index, large displacement Shape Memory Alloy (SMA) coil actuators for use in macro- and micro-systems
Author(s): Brad Holschuh; Dava Newman
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Paper Abstract

Shape memory alloys (SMA) offer unique shape changing characteristics that can be exploited to produce low­ mass, low-bulk, large-stroke actuators. We are investigating the use of low spring index (defined as the ratio of coil diameter to wire diameter) SMA coils for use as actuators in morphing aerospace systems. Specifically, we describe the development and characterization of minimum achievable spring index coiled actuators made from 0.3048 mm (0.012") diameter shape memory alloy (SMA) wire for integration in textile architectures for future compression space suit applications. Production and shape setting of the coiled actuators, as well as experimental test methods, are described. Force, length and voltage relationships for multiple coil actuators are reported and discussed. The actuators exhibit a highly linear (R2 < 0.99) relationship between isometric blocking force and coil displacement, which is consistent with current SMA coil models; and SMA coil actuators demonstrate the ability to produce significant linear forces (i.e., greater than 8 N per coil) at strains up to 3x their initial (i.e., fully coiled) length. Discussions of both the potential use of these actuators in future compression space suit designs, and the broader viability of these actuators in both macro- and micro-systems, are presented.

Paper Details

Date Published: 7 March 2014
PDF: 11 pages
Proc. SPIE 8975, Reliability, Packaging, Testing, and Characterization of MOEMS/MEMS, Nanodevices, and Nanomaterials XIII, 897505 (7 March 2014); doi: 10.1117/12.2044406
Show Author Affiliations
Brad Holschuh, Massachusetts Institute of Technology (United States)
Dava Newman, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 8975:
Reliability, Packaging, Testing, and Characterization of MOEMS/MEMS, Nanodevices, and Nanomaterials XIII
Herbert R. Shea; Rajeshuni Ramesham, Editor(s)

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