Low spring index, large displacement Shape Memory Alloy (SMA) coil actuators for use in macro- and micro-systems
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Newman_Low spring.pdf
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2.28 MB
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597e7aec22d666e38ceb9e1c401d33f5
Author(s)
Newman, Dava
Holschuh, Bradley T.
Date Issued
March 2014
Journal
Proceedings of SPIE--the International Society for Optical Engineering
Publisher
SPIE
Citation
Holschuh, Brad, and Dava Newman. “Low Spring Index, Large Displacement Shape Memory Alloy (SMA) Coil Actuators for Use in Macro- and Micro-Systems.” Edited by Herbert R. Shea and Rajeshuni Ramesham. Reliability, Packaging, Testing, and Characterization of MOEMS/MEMS, Nanodevices, and Nanomaterials XIII (March 7, 2014). © 2014 SPIE
Version
Final published version
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 (R[superscript 2] < 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.
MIT Department
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
Massachusetts Institute of Technology.
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DOI of Published Version
https://doi.org/10.1117/12.2044406
