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

0538049 - ÚTIA 2022 RIV GB eng J - Článek v odborném periodiku
Frost, Miroslav - Benešová, Barbora - Seiner, Hanuš - Kružík, Martin - Sedlák, Petr - Šittner, Petr
Thermomechanical model for NiTi-based shape memory alloys covering macroscopic localization of martensitic transformation.
International Journal of Solids and Structures. Roč. 221, č. 1 (2021), s. 117-129. ISSN 0020-7683. E-ISSN 1879-2146
Grant CEP: GA ČR GA18-03834S
Institucionální podpora: RVO:67985556 ; RVO:61388998 ; RVO:68378271
Klíčová slova: NiTi shape memory alloys * constitutive modeling * localization * Mori-Tanaka method
Obor OECD: Pure mathematics; Applied mechanics (UT-L); Materials engineering (UT-L); Condensed matter physics (including formerly solid state physics, supercond.) (FZU-D)
Impakt faktor: 3.667, rok: 2021
Způsob publikování: Omezený přístup
http://library.utia.cas.cz/separaty/2021/MTR/kruzik-0538049.pdf https://doi.org/10.1016/j.ijsolstr.2020.08.012

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.
Trvalý link: http://hdl.handle.net/11104/0316076