Development of Stress-Induced Martensitic Transformation in TiNi Shape Memory Alloy
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TiNi shape memory alloy (SMA) was subjected to tension at strain-controlled test on quasistatic testing machine. The nucleation, development, and saturation of the stress-induced martensitic transformation were investigated, taking into account the obtained dependency of mechanical parameters and the specimen temperature changes measured by an infrared camera (IR). Three kinds of data obtained by the IR system were analyzed: the temperature distribution on the SMA sample surface, the temperature changes derived as average from the chosen sample area, and the temperature profiles obtained along the sample length. The temperature distribution shows nucleation of the transformation process and a creation of the transformation bands. The average temperature reflects the effects of thermomechanical coupling, accompanying exothermic martensitic forward and endothermic reverse transformation. The temperature profiles revealed the temperature difference between the band and the rest of the sample. The experimental results were supported with finite element method numerical analysis (FEM). The FEM software components for structural and heat transfer problems, coupled in partitioned approach, were used for thermomechanical analysis.
Keywordsfinite element modeling infrared camera material testing martensitic transformation TiNi shape memory alloy tension thermomechanical couplings
The research has been carried out with support of the KMM-VIN Research Fellowship; 1.08-13.09. 2013, Polish National Center of Science under Grant No. 2011/01/M/ST8/07754, (JSPS) Grant-in-Aid for Scientific Research (C) under No. 23560103 and Serbian Ministry of Education, Science and Technological Development under Grant No. Project TR32036 and III41007. Authors are grateful to Prof. Zenon Mroz for his valuable advice and comments. Also, authors thank to L. Urbanski for obtaining and processing the mechanical data and to M. Maj for recording and elaborating the thermograms and temperature changes.
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