Jaka Tušek (Author), Kurt Engelbrecht (Author), Lluís Mañosa (Author), Eduard Vives (Author), Nini Pryds (Author)

Abstract

This paper presents direct and indirect methods for studying the elastocaloric effect (eCE) in shape memory materials and its comparison. The eCE can be characterized by the adiabatic temperature change or the isothermal entropy change (both as a function of applied stress/strain). To get these quantities, the evaluation of the eCE can be done using either direct methods, where one measures (adiabatic) temperature changes or indirect methods where one can measure the stress-strain-temperature characteristics of the materials and from these deduce the adiabatic temperature and isothermal entropy changes. The former can be done using the basic thermodynamic relations, i.e. Maxwell relation and Clausius-Clapeyron equation. This paper further presents basic thermodynamic properties of shape memory materials, such as the adiabatic temperature change, isothermal entropy change and total entropy-temperature diagrams (all as a function of temperature and applied stress/strain) of two groups of materials (NiTi and CuZnAl alloys) obtained using indirect methods through phenomenological modelling and Maxwell relation. In the last part of the paper, the basic definition of the efficiency of the elastocaloric thermodynamic cycle (coefficient of performance) is defined and discussed.

Keywords

elektrokalorični učinek;zlitine z oblikovnim spominom;superelastičnost;elastocaloric effect;shape memory alloy;superelasticity;adiabatic temperature change;isothermal entropy change;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 697:621.577(045)
COBISS: 15128091 Link will open in a new window
ISSN: Y508-7058
Views: 2423
Downloads: 297
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Other data

Secondary language: Slovenian
Secondary keywords: elektrokalorični učinek;zlitine z oblikovnim spominom;superelastičnost;
Type (COBISS): Article
Pages: f. 317-329
Volume: ǂVol. ǂ2
Issue: ǂiss. ǂ4
Chronology: Dec. 2016
DOI: 10.1007/s40830-016-0094-8
ID: 12855955
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