Title

A Thermal Conduction Switch Based On Low Hysteresis Nitife Shape Memory Alloy Helical Springs

Keywords

Actuator; NiTiFe; R-phase; Shape memory; Switch

Abstract

Shape memory alloy (SMA) actuators possess an inherent property of sensing a change in temperature and delivering significant force against external loads through a shape change resulting from a temperature-induced phase transformation. The utilization of a reversible trigonal (R-phase) to cubic phase transformation in NiTiFe SMAs allows for this strain recovery to occur with reduced hysteresis between the forward and reverse transformations. However, the magnitude of the strain recovery associated with the R-phase transformation is lower than that of the monoclinic to cubic phase transformation. The use of helical springs can compensate for this design constraint as they produce significant stroke when compared to straight elements such as thin strips and wires. This work reports on the development and implementation of NiTiFe helical springs in a low-hysteresis thermal conduction switch for advanced spaceport applications associated with NASA's requirements for future lunar and Mars missions. Such a low-hysteresis thermal conduction switch can provide on-demand heat transfer between two reservoirs at different temperatures. © 2008 American Institute of Physics.

Publication Date

3-20-2008

Publication Title

AIP Conference Proceedings

Volume

986

Number of Pages

3-9

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1063/1.2900374

Socpus ID

40749108409 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/40749108409

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