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Numerical simulation and experimental investigation of the elastocaloric cooling effect in sputter-deposited TiNiCuCo thin films [in press]

Welsch, F.; Ullrich, J.; Ossmer, H.; Schmidt, M.; Kohl, M.; Chluba, C.; Quandt, E.; Schütze, A.; Seelecke, S.

Abstract (englisch):
The exploitation of the elastocaloric effect in superelastic shape memory alloys (SMA) for cooling applications shows a promising energy efficiency potential but requires a better understanding of the non-homogeneous martensitic phase transformation. Temperature profiles on sputter-deposited superelastic Ti55.2Ni29.3Cu12.7Co2.8 shape memory alloy thin films show localized release and absorption of heat during phase transformation induced by tensile deformation with a strong rate dependence. In this paper, a model for the simulation of the thermo-mechanically coupled transformation behavior of superelastic SMA is proposed and its capability to reproduce the mechanical and thermal responses observed during experiments is shown. The procedure for experiment and simulation is designed such that a significant temperature change from the initial temperature is obtained to allow potential cooling applications. The simulation of non-local effects is enabled by the use of a model based on the one-dimensional Müller–Achenbach–Seelecke model, extended by 3D mechanisms such as lateral contraction and by non-local interaction, leading to localiz ... mehr


Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.1007/s00161-017-0582-x
ISSN: 0935-1175, 1432-0959
KITopen ID: 1000071498
HGF-Programm 43.22.01; LK 01
Erschienen in Continuum mechanics and thermodynamics
Seiten 1-16
Schlagworte Elastocaloric cooling · Shape memory alloy · TiNiCuCo thin film · Thermo-mechanical coupling · Rate dependence · Localization · Propagating transformation fronts · Finite element analysis · Phase transformation · Thermodynamics
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