Low spring index, large displacement Shape Memory Alloy (SMA) coil actuators for use in macro- and micro-systems

Brad Holschuh, Dava Newman

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationReliability, Packaging, Testing, and Characterization of MOEMS/MEMS, Nanodevices, and Nanomaterials XIII
PublisherSPIE
ISBN (Print)9780819498885
DOIs
StatePublished - 2014
Externally publishedYes
EventReliability, Packaging, Testing, and Characterization of MOEMS/MEMS, Nanodevices, and Nanomaterials XIII - San Francisco, CA, United States
Duration: Feb 3 2014Feb 4 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8975
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherReliability, Packaging, Testing, and Characterization of MOEMS/MEMS, Nanodevices, and Nanomaterials XIII
Country/TerritoryUnited States
CitySan Francisco, CA
Period2/3/142/4/14

Keywords

  • Active materials
  • Active textiles
  • Adaptive systems
  • Coil actuators
  • MEMS actuators
  • Morphing systems
  • Nickel titanium
  • Shape memory alloys (SMAs)

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