Tashchuk R. Deformation of anisotropic crystals with sharply nonlinear mechanical properties under conditions of limited stress relaxation

Українська версія

Thesis for the degree of Doctor of Philosophy (PhD)

State registration number

0823U101214

Thesis Registration Form

0823U101214.pdf

Applicant for

Specialization

  • 104 - Фізика та астрономія

23-11-2023

Specialized Academic Board

ДФ 76.051.033 (ID 2335)

Yuriy Fedkovych Chernivtsi National University

Essay

The dissertation is devoted to study the main auxetic characteristics of the single crystals, polycrystals, films and nanolayers within the framework of the elasticity theory for anisotropic crystals, by the methods of physical acoustics and computer technologies for processing experimental results. Software has been developed to construct characteristic surfaces of Young’s moduli (CSYM) Еі, angular distributions of Poisson’s ratios (ADPR) μ(φ, Θ, ψ), indicating auxeticity surfaces (IAS) S(x,y,z), and determine the extreme values of Poisson’s ratios (EVPR) μmin, μmax and degree of auxeticity Sa for single crystals of arbitrary syngony. The regularities and mechanisms of the formation of the main auxetic characteristics in such materials are analyzed taking into account the type of chemical bond.

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Research papers

Raranskyi M.D., Oliinych-Lysiuk A.V., Kurek I.G., Tkach O.O., Tashchuk R.Yu., Lysiuk O.V. Features of Thermoplastic Deformations of Quasi-Anisotropic 2D Layers of Indium. Metallophysics and Advanced Technologies. 2020. Vol. 42. №. 7. P. 1015–1027.

Раранський М.Д., Олійнич-Лисюк А.В., Тащук Р.Ю., Лисюк О.В., Тащук О.Ю. Особливості деформації в кристалах іn у широкому інтервалі температур / Features of Deformation in Crystals of Indium in a Wide Range of Temperatures. Металлофизика и новейшие технологии. 2018. Т. 40. №11. C.1453-1463. (Scopus)

Раранський М.Д., Олійнич-Лисюк А.В., Тащук Р.Ю., Тащук О.Ю,. Струк А.Я, Унгурян М.А. Ауксетичні властивості деяких інтерметалічних сполук / Auxetic properties of some intermetallic compounds. Фізика і хімія твердого тіла / Physics and Chemistry of Solid State. 2022. Vol. 23. №. 4. P. 764-775 (Scopus).

Raranskiy M.D., Oliynych-Lysiuk A.V., Tashchuk R.Yu., Struk A.Ya., Tashchuk O.Yu., Hulyk S. V. Auxetic properties of silicon dioxide single crystals. SPIE. 2021, Vol. 12126. ISSN: 0277-786X (Scopus).

Raransky M., Oliinych-Lysiuk A., Tashchuk R., Unhurian M. Discovering the mechanisms that form the auxetic properties of single crystals in a monoclinic crystal system. Eastern-European Journal of Enterprise Technologies. 2020. Vol. 5.№. 5 (107) (Scopus) (Q3 – https://www.scimagojr.com/journalsearch.php?q=21100450083&tip=sid&clean=0).

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Files

autoreferat-Анотація.pdf

Дисертація Тащук Р-Ю-.pdf

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