Abstract
In this paper, a micromechanical-based constitutive model is proposed for superelastic NiTi shape memory alloy and it is implemented into the finite element software. The thermodynamic driving forces of martensitic transformation and martensitic reorientation are derived from the reduced Clausius–Duhem inequality. In order to achieve numerical stability and to improve computational efficiency, additional constraints on the evolution of martensite volume fraction are introduced. The texture of NiTi tubes is taken into consideration. It is verified that the measured superelastic responses under various loading conditions are well approximated by the presented approach.
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