magistrsko delo
Žiga Žnidarič (Author), Srečko Glodež (Mentor), Nejc Novak (Co-mentor)

Abstract

V magistrskem delu je izvedena simulacija utrujanja osnosimetrične kiralne celične strukture in njene modificirane oblike, narejenih iz nerjavnega jekla 316L. Opisane so teoretične osnove celičnih struktur s predstavitvijo obeh geometrij. Nadaljuje se s teoretičnimi osnovami utrujanja materialov, s poudarkom na deformacijski metodi. Opisano je, kako sta bili generirani geometriji s pomočjo programske kode in prilagojeni za uporabo v numeričnih simulacijah. Sledilo je določevanje materialnih parametrov, obremenitev, podpor in podatkov za izračun življenjske dobe. Geometriji sta bili obremenjeni s pomiki v obliki sinusnega valovanja. Modela sta bila diskretizirana z mrežo končnih elementov, določeno s konvergenčno analizo. Podatke smo beležili v tabelah, s pomočjo katerih smo izrisali grafe, ki prikazujejo, kako se življenjska doba spremeni v odvisnosti od velikosti obremenitve. Sledili smo tudi poteku napetosti in stopnjam plastične deformacije, ki se pojavijo v strukturah. Rezultati so pokazali, da kljub boljši porazdelitvi napetosti je življenjska doba optimizirane strukture krajša.

Keywords

celične strukture;avksetičnost;deformacijska metoda;ciklično utrujanje;numerična analiza;življenjska doba;magistrske naloge;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: [Ž. Žnidarič]
UDC: 620.178.3:669.14.018.8-176(043.2)
COBISS: 208015107 Link will open in a new window
Views: 110
Downloads: 16
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Other data

Secondary language: English
Secondary title: Fatigue analysis of axisymmetric chiral cellular structure made out of 316l stainless steel
Secondary abstract: In the master's thesis, fatigue analysis of an axisymmetric chiral cellular structure and its modified form, made of stainless steel 316L, is carried out. The theoretical foundations of cellular structures are described, and the two geometries are presented. It continues with theoretical basics of material fatigue with an emphasis on strain-life method. We continue with describing how the geometries were generated using a script and adapted for use in numerical simulations. This was followed by the determination of material parameters, loads, supports and data for calculation life expectancy. Displacement in the shape of a sine wave was used as the load on both specimens. The models were divided with a finite element mesh determined by convergence analysis. The data was recorded and presented in graphs that showed how the life expectancy of the structures changes depending on the level of strain. We also analyzed stresses and plastic deformation that occur in the structures. The results showed that despite a better distribution of stress, the life expectancy of the optimized structure was shorter.
Secondary keywords: cellular structures;auxetic behaviour;strain-life method;cyclic fatigue;numerical analysis;life expectancy;
Type (COBISS): Master's thesis/paper
Thesis comment: Univ. v Mariboru, Fak. za strojništvo, Konstrukterstvo
Pages: 1 spletni vir (1 datoteka PDF (XII, 53 f.))
ID: 24575815