magistrsko delo
Jure Vinkovič (Author), Srečko Glodež (Mentor), Marko Šori (Co-mentor)

Abstract

The basis of the master thesis is an in-depth and comprehensive analysis of the scientific literature on damage models of thermo-mechanical fatigue. The aim of the thesis is to investigate and determine the suitability of damage models for their application in numerical simulations of components subjected to thermo-mechanical loading with in-phase, out-of-phase or constant temperature cycles. The theoretical background of material behavior under static and dynamic loads (e.g. low-cycle fatigue, high-cycle fatigue) is presented. The work also includes an overview of damage mechanisms typical of time-temperature varying loading conditions (e.g. cyclic softening and hardening of the material, mean stress relaxation, material creep, visco-plasticity, etc.). This is followed by a structured review of several damage models of thermo-mechanical fatigue (e.g. Neu-Sehitoglu, DTMF, Coffin-Manson, Ostergren, Smith-Watson-Topper, Unified Energy Approach, etc.). An overview of the experimental tests on aluminum alloy and cast iron carried out at temperatures up to 800 °C is given. The idea of processing the raw experimental data including the calibration procedure of the thermo-mechanical fatigue damage models is schematically illustrated and described. The basic mathematical laws of constitutive material models for both material types are given. In the conclusion of the MSc thesis, the correlations of the calibrated damage models are presented, which, together with the constructive opinions, give an important message on the application of the individual damage models depending on the type of material and the loading method.

Keywords

thermo-mechanical fatigue;constitutive material model;damage model;aluminum alloy;cast iron alloy;finite element method;

Data

Language: English
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: [J. Vinkovič]
UDC: 620.178.3(043.2)
COBISS: 105429507 Link will open in a new window
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Other data

Secondary language: Slovenian
Secondary title: Primerjava in implementacija poškodbenih modelov termo-mehanskega utrujanja
Secondary abstract: Temelj magistrskega dela je poglobljena in izčrpna analiza znanstvene literature s področja poškodbenih modelov termo-mehanskega utrujanja. Namen dela je raziskati in ugotoviti primernost poškodbenih modelov, za aplikacije le-teh, v numeričnih simulacijah komponent, ki so izpostavljene termo-mehanskemu obremenjevanju s cikli v fazi, cikli iz faze ali konstantni temperaturi. Predstavljeno je teoretično ozadje obnašanja materiala pri statičnih in dinamičnih obremenitvah (npr. malo-ciklično utrujanje, veliko-ciklično utrujanje). Delo prav tako zajema pregled poškodbenih mehanizmov, ki so tipični za časovno-temperaturno se spreminjajoče obremenitvene pogoje (npr. ciklično mehčanje in utrjevanje materiala, sprostitev vpliva srednje napetosti, lezenje materiala, visko-plastičnost,…). Sledi strukturiran pregled več poškodbenih modelov termo-mehanskega utrujanja (npr. Neu-Sehitoglu, DTMF, Coffin-Manson, Ostergren, Smith-Watson-Topper, Unified Energy Approach,…). Podan je pregled eksperimentalnih testov aluminijeve zlitine in litega železa, ki so bili izvedeni pri temperaturah do 800 °C. Shematsko je prikazana in opisana ideja obdelave surovih eksperimentalnih podatkov vključno s postopkom kalibracije poškodbenih modelov termo-mehanskega utrujanja. Podane so osnovne matematične zakonitosti konstitutivnih materialnih modelov za obe vrsti materiala. V zaključku magistrskega dela so predstavljene korelacije kalibriranih poškodbenih modelov, ki skupaj s konstruktivnimi mnenji, podajo pomembno sporočilo o aplikaciji posameznih poškodbenih modelov v odvisnosti od vrste materiala in načina obremenjevanja.
Secondary keywords: termo-mehansko utrujanje;konstitutivni materialni model;poškodbeni model;aluminijeve zlitine;lito železo;metoda končnih elementov;magistrske naloge;
Type (COBISS): Master's thesis/paper
Embargo end date (OpenAIRE): 2024-12-20
Thesis comment: Univ. v Mariboru, Fak. za strojništvo, Konstrukterstvo
Pages: XII, 66 str.
ID: 13851043