SEM, 2019, #2, 50-58 pages
Journal Современная электрометаллургия
Publisher International Association «Welding»
ISSN 2415-8445 (print)
Issue № 2, 2019 (June)
Computer modeling of structural transformations in shape memory alloys
V.A. Kostin , G.M. Grigorenko
E.O. Paton Electric Welding Institute of the NAS of Ukraine.
11 Kazimir Malevich Str., 03150, Kyiv, Ukraine. E-mail: email@example.com
Computer 3D modeling of medical stents, made of shape memory materials, was made, kinetics of structural transformations in the process of γ↔α′ transformations was analyzed, their effect on stress-strain state was investigated. Calculations were made for shape memory alloys: nitinol (NiTi) and Cu–Zn–Al, used in medicine. The mathematical model was suggested for description of shape memory effects and hyperelasticity. Numerical modeling of structural transformations, stress-strain state of the stent, shape memory effects and hyperelasticity was carried out by using the calculation multiphysical package COMSOL Multiphysics. Peculiar features of martensite formation in the stent during deformation were established. Ref. 12., Tabl. 2, Fig. 10.
Key words: shape memory materials; nitinol; stent; phase transformations; austenite; stress-strain state
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