magistrsko delo
Jernej Rihter (Author), Janez Kramberger (Mentor), Žiga Donik (Co-mentor)

Abstract

Žilne opornice omogočajo neoviran krvni obtok. Pogosto se za material žilnih opornic uporablja zlitina niklja in titana, znana pod komercialnim imenom Nitinol. Ta spada v skupino materialov z oblikovnim spominom. Posebna značilnost teh materialov je pojav superelastičnosti. Magistrsko delo proučuje vpliv uporabe superelastičnega in linearno elastičnega materialnega modela na rezultate simulacije stiskanja obroča žilne opornice, ki je parametrično modeliran v programskem jeziku Python in z uporabo knjižnic projektov PyAnsys (PyMAPDL). Rezultati so osredotočeni na napetosti in radialno togost, kjer opazujemo reakcijsko silo. Numerična simulacija temelji na metodi končnih elementov in je izvedena v programu Ansys. Analiza ob različnih materialnih modelih primerja tudi vpliv diskretizacije modela z enodimenzionalnimi in trodimenzionalnimi končnimi elementi. Rezultati magistrskega dela ugotavljajo, da ima materialni model pomemben vpliv na pravilen opis napetosti ob stiskanju obroča žilne opornice kot tudi na vrednosti reakcijske sile. Opazimo, da različna diskretizacija ne vpliva na reakcijsko silo, povzroča pa razlike v napetosti med obema modeloma.

Keywords

žilna opornica;spominske zlitine;superelastičnost;Nitinol;numerična simulacija;metoda končnih elementov;Ansys;Python;PyAnsys;magistrske naloge;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: [J. Rihter]
UDC: [519.6:539.3]:616.1(043.2)
COBISS: 227863555 Link will open in a new window
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Other data

Secondary language: English
Secondary title: The utilization of a superelastic material model for numerical simulations of vascular stent compression
Secondary abstract: Vascular stents allow unobstructed blood circulation. The material often used for vascular stents is an alloy of nickel and titanium, commercially known as Nitinol. It belongs to the group of shape memory materials. A particular feature of these materials is the phenomenon of superelasticity. This thesis investigates the influence of the use of a superelastic and a linear-elastic material model on the results of a compression simulation of a vascular stent ring, parametrically modelled in the Python programming language and using the PyAnsys project libraries (PyMAPDL). The results focus on stress and radial stiffness, where the reaction force is observed. The numerical simulation is based on the finite element method and is executed in Ansys. Alongside different material models, analysis also compares the effect of model discretization with one-dimensional and three-dimensional finite elements. The results of the thesis conclude that the material model has a significant influence on the correct description of the compression stress of the vascular stent ring and also on the values of the reaction force. It is observed that the discretization method does not affect reaction force, but it does cause differences in the stress between the two models.
Secondary keywords: vascular stent;shape-memory alloys;superelasticity;Nitinol;numerical simulation;finite element method;Ansys;Python;PyAnsys;
Type (COBISS): Master's thesis/paper
Thesis comment: Univ. v Mariboru, Fak. za strojništvo, Konstrukterstvo
Pages: 1 spletni vir (1 datoteka PDF (X, 50 f.))
ID: 25856574