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Materials 2019, 12(6), 883; https://doi.org/10.3390/ma12060883

Experimental and Numerical Investigation of Mechanical and Thermal Effects in TiNi SMA during Transformation-Induced Creep Phenomena

1
University of Kragujevac, Faculty of Engineering, Sestre Janjić 6, 34000 Kragujevac, Serbia
2
Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawińskiego 5b, 02-106 Warsaw, Poland
3
Department of Mechanical Engineering, Aichi Institute of Technology, 1247 Yachigusa, Yakusa-cho, Toyota 470-0392, Japan
*
Author to whom correspondence should be addressed.
Received: 8 February 2019 / Revised: 9 March 2019 / Accepted: 12 March 2019 / Published: 16 March 2019
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Abstract

(1) The paper presents experimental and numerical results of the TiNi shape memory alloy (SMA) subjected to a modified program of force-controlled tensile loading. The time-dependent development of transformation strain under the constant-force conditions was investigated to describe transformation-induced creep phenomena. (2) Mechanical characteristics of the TiNi SMA were derived using a testing machine, whereas the SMA temperature changes accompanying its deformation were obtained in a contactless manner with an infrared camera. A 3D coupled thermo-mechanical numerical analysis, realized in a partitioned approach, was applied to describe the SMA mechanical and thermal responses. (3) The stress and related temperature changes demonstrated how the transformation-induced creep process started and evolved at various stages of the SMA loading. The proposed model reproduced the stress, strain and temperature changes obtained during the experiment well; the latent heat production is in correlation with the amount of the martensitic volume fraction. (4) It was demonstrated how the transformation-induced creep process occurring in the SMA under such conditions was involved in thermo-mechanical couplings and the related temperature changes. View Full-Text
Keywords: TiNi shape memory alloy; phase transformation-induced creep; martensitic transformation; temperature change; thermomechanical couplings; infrared camera; thermo-mechanical coupled numerical analysis TiNi shape memory alloy; phase transformation-induced creep; martensitic transformation; temperature change; thermomechanical couplings; infrared camera; thermo-mechanical coupled numerical analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Dunić, V.; Pieczyska, E.A.; Kowalewski, Z.L.; Matsui, R.; Slavković, R. Experimental and Numerical Investigation of Mechanical and Thermal Effects in TiNi SMA during Transformation-Induced Creep Phenomena. Materials 2019, 12, 883.

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