Effects of surface finish and mechanical training on Ni-Ti sheets for elastocaloric cooling

Kurt Engelbrecht, Jaka Tusek, Simone Sanna, Dan Eriksen, Oleg Mishin, Christian Bahl, Nini Pryds

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Abstract

Elastocaloric cooling has emerged as a promising alternative to vapor compression in recent years. Although the technology has the potential to be more efficient than current technologies, there are many technical challenges that must be overcome to realize devices with high performance and acceptable durability. We study the effects of surface finish and training techniques on dog bone shaped polycrystalline samples of NiTi. The fatigue life of several samples with four different surface finishes was measured and it was shown that a smooth surface, especially at the edges, greatly improved fatigue life. The effects of training both on the structure of the materials and the thermal response to an applied strain was studied. The load profile for the first few cycles was shown to change the thermal response to strain, the structure of the material at failure while the final structure of the material was weakly influenced by the surface finish.
Original languageEnglish
Article number064110
JournalA P L Materials
Volume4
Number of pages6
ISSN2166-532X
DOIs
Publication statusPublished - 2016

Bibliographical note

All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)

Keywords

  • Shape memory effect
  • Surface finishing
  • Stress strain relations
  • Materials modification
  • Testing procedures

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