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Title: Experimental and numerical investigation of mechanical and thermal effects in TiNi SMA during transformation-induced creep phenomena
Authors: Dunić, Vladimir
Pieczyska, Elzbieta
Kowalewski Z.
Matsui R.
Slavkovic R.
Journal: Materials
Issue Date: 1-Mar-2019
Abstract: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. All right reserved. (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.
Type: Article
DOI: 10.3390/ma12060883
SCOPUS: 85063510521
Appears in Collections:Faculty of Engineering, Kragujevac
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