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

Engelbrecht, Kurt (author), Tušek, Jaka (author), Sanna, Simone (author), Eriksen, Dan (author), Mishin, Oleg V. (author), Bahl, Christian Robert Haffenden (author), Pryds, Nini (author)

Elastocaloric cooling has emerged as a promising alternative to vapor compression in recent years. Although the technology has the potential to be more e ffi cient than current technologies, there are many technical challenges that must be overcome to realize devices with high performance and acceptable durability. We study the e ff ects of surface finish and training techniques on dog bone shaped polycrystalline samples of NiTi. The fatigue life of several samples with four di ff erent surface finishes was measured and it was shown that a smooth surface, especially at the edges, greatly improved fatigue life. The e ff ects 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.

• Language: English
• Keywords: elastocaloric effect, surface finish, colling, fatigue life, shape memory material
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Article acceptance date: 17.06.2016
• Publication date: 28.06.2016
• Year: 2016
• Number of pages: Str.. 1-6
• Numbering: Vol. 4, iss. 6, art. 064110
• PID: 20.500.12556/RUL-126687
• UDC: 621.565.91(045)
• ISSN on article: 2166-532X
• DOI: 10.1063/1.4955131
• COBISS.SI-ID: 14774555
• Publication date in RUL: 04.05.2021

Record is a part of a journal

• Title: APL materials
• Publisher: AIP Publishing
• ISSN: 2166-532X
• COBISS.SI-ID: 20267784

Licences

• License: CC BY 3.0, Creative Commons Attribution 3.0 Unported
• Link: https://creativecommons.org/licenses/by/3.0/deed.en
• Description: You are free to reproduce and redistribute the material in any medium or format. You are free to remix, transform, and build upon the material for any purpose, even commercially. You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
• Licensing start date: 28.06.2016

Secondary language

• Language: Slovenian
• Keywords: elastokalorični efekt, kvaliteta površine, hlajenje, doba trajanja, material z oblikovnim spominom

Projects

• Funder: Other - Other funder or multiple funders
• Funding programme: DTU’s international H. C. Ørsted postdoc

• Funder: ARRS - Slovenian Research Agency
• Project number: Z2-7219
• Name: Od elastokaloričnega efekta do učinkovite hladilne naprave