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Thin-walled Ni-Ti tubes under compression : ideal candidates for efficient and fatigue-resistant elastocaloric cooling
ID Porenta, Luka (Author), ID Kabirifar, Parham (Author), ID Žerovnik, Andrej (Author), ID Čebron, Matjaž (Author), ID Žužek, Borut (Author), ID Dolenec, Matej (Author), ID Brojan, Miha (Author), ID Tušek, Jaka (Author)

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Abstract
Elastocaloric cooling is emerging as one of the most promising alternatives to vapor-compression cooling technology. It is based on the elastocaloric effect (eCE) of shape memory alloys (SMAs), which occurs due to a stress-induced martensitic transformation (superelasticity). In recent years, several elastocaloric proof-of-concept devices have been developed and the best of them have already achieved commercially relevant cooling characteristics. However, the proposed devices are not yet ready for commercialization, mostly due to their short fatigue life, which is a consequence of the tensile loading. The fatigue life can be significantly improved if the material is instead subjected to compressive loading, but mechanical instabilities (buckling) and the poor heat transfer of bulky geometries (favorable for compression) are the major challenges to overcome when designing compressed elastocaloric elements. Here, we show for the first time that thin-walled Ni-Ti tubes, which allow for the rapid heat transfer, can withstand more than 10$^6$ compressive loading cycles without any degradation of the eCE while maintaining high efficiency (coefficient of performance) and adiabatic temperature changes as high as 27 K. This is the largest, directly measured, durable eCE for any elastocaloric material in the high-cycle fatigue regime to date, and so opens up new avenues in the development of durable and efficient elastocaloric devices.

Language:English
Keywords:elastocaloric effect, shape memory alloys, fatigue life, compressive loading, buckling
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
NTF - Faculty of Natural Sciences and Engineering
Publication status:Published
Publication version:Version of Record
Year:2020
Number of pages:9 str.
Numbering:Vol. 20, art. 100712
PID:20.500.12556/RUL-116755 This link opens in a new window
UDC:519.6:620.178(045)
ISSN on article:2352-9415
DOI:10.1016/j.apmt.2020.100712 This link opens in a new window
COBISS.SI-ID:18414339 This link opens in a new window
Publication date in RUL:08.06.2020
Views:2202
Downloads:458
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Record is a part of a journal

Title:Applied materials today
Publisher:Elsevier
ISSN:2352-9415
COBISS.SI-ID:527289625 This link opens in a new window

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

Language:Slovenian
Keywords:elastokalorični učinek, zlitine z oblikovnim spominom, doba trajanja, tlačno obremenjevanje, uklon

Projects

Funder:EC - European Commission
Funding programme:H2020
Project number:803669
Name:Superelastic Porous Structures for Efficient Elastocaloric Cooling
Acronym:SUPERCOOL

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