2019 №02 (07) DOI of Article
2019 №02 (01)

Electrometallurgy Today 2019 #02
SEM, 2019, #2, 50-58 pages

Journal                    Современная электрометаллургия
Publisher                International Association «Welding»
ISSN                      2415-8445 (print)
Issue                       № 2, 2019 (June)
Pages                      50-58

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: office@paton.kiev.ua

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

Received:                22.04.19
Published:               13.06.19


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