4.7 Article

A cyclic integrated microstructural-mechanical model for a shape memory alloy

Journal

INTERNATIONAL JOURNAL OF FATIGUE
Volume 153, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2021.106473

Keywords

Shape memory alloys; Cyclic properties; Tensile loading

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Shape memory alloys have the ability to recover their initial shape due to their memory property of changing microstructure. This study proposes an integrated microstructural-mechanical model for equiatomic NiTi shape memory alloy.
Shape memory alloys are able to recover the initial shape even after a large deformation. The memory property is due to the ability to change the microstructure under a variation of the stress state or the temperature. The stress-strain curve is characterized by the presence of a stage where the slope of the curve sharply decreases and the initial microstructure transforms into a new one. In this work, an integrated microstructural-mechanical model is proposed for the equiatomic NiTi shape memory alloy, that is suitable to predict the cyclic behaviour of a pseudoelastic shape memory alloy starting from the microstructure composition.

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