Please use this identifier to cite or link to this item: https://scidar.kg.ac.rs/handle/123456789/11379
Title: Stress Relaxation Effects in TiNi SMA During Superelastic Deformation: Experiment and Constitutive Model
Authors: Pieczyska, Elzbieta
Kowalewski Z.
Dunić, Vladimir
Issue Date: 2017
Abstract: © 2017, ASM International. This paper presents an investigation of thermomechanical effects related to the phenomena of stress relaxation occurring in TiNi SMA subjected to modified program of displacement-controlled tension. The deformation data were taken from testing machine, whereas the temperature changes accompanying the exothermic/endothermic martensite forward/reverse transformation were measured by infrared camera. At the advanced stages of the transformations, the strain was kept constant for a few minutes and the SMA load and temperature were recorded continuously. As a consequence, the stress and temperature changed significantly during the loading stops. A large stress drop, caused by the transformation, was observed during the relaxation stage in both courses of the SMA loading and unloading. Moreover, the non-uniform temperature distribution, reflecting macroscopically inhomogeneous transformation, lapsed while the strain was kept constant, yet restarted at the end of the relaxation stop and developed at the reloading stage. Along with the experimental results, the mechanical and thermal responses induced by the transformation were obtained by 3D coupled thermomechanical numerical analysis, realized in partitioned approach. Latent heat production was correlated with an amount of the martensitic volume fraction. The stress and temperature drops recorded during the experiment were satisfactorily reproduced by the model proposed for the SMA thermomechanical coupling.
URI: https://scidar.kg.ac.rs/handle/123456789/11379
Type: article
DOI: 10.1007/s40830-017-0123-2
ISSN: 2199-384X
SCOPUS: 2-s2.0-85063525263
Appears in Collections:Faculty of Engineering, Kragujevac

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