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Journal Article

Thermomechanical model for NiTi-based shape memory alloys covering macroscopic localization of martensitic transformation

Frost Miroslav, Benešová Barbora, Seiner Hanuš, Kružík Martin, Sedlák Petr, Šittner Petr

: International Journal of Solids and Structures vol.221, 1 (2021), p. 117-129

: GA18-03834S, GA ČR

: NiTi shape memory alloys, constitutive modeling, localization, Mori-Tanaka method

: 10.1016/j.ijsolstr.2020.08.012

: http://library.utia.cas.cz/separaty/2021/MTR/kruzik-0538049.pdf

: https://doi.org/10.1016/j.ijsolstr.2020.08.012

(eng): The work presents a thermomechanical model for polycrystalline NiTi-based shape memory alloys developed within the framework of generalized standard solids, which is able to cover loading-mode dependent localization of the martensitic transformation. The key point is the introduction of a novel austenite–martensite interaction term responsible for the strain-softening of the material. Mathematical properties of the model are analyzed, and a suitable regularization and a time-discrete approximation for numerical implementation to the finite-element method are proposed. Model performance is illustrated on two numerical simulations: the tension of a superelastic NiTi ribbon and bending of a superelastic NiTi tube.

: BA

: 10101