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undergraduate thesis
Procjena zamora u vremenskoj i frekvencijskoj domeni za bimodalni spektar naprezanja
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2021. urn:nbn:hr:235:159636
Večerić, Sara
University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

Institutional repository: Repository of Faculty of Mechanical Engineering and Naval Architecture University of Zagreb

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Večerić, S. (2021). Procjena zamora u vremenskoj i frekvencijskoj domeni za bimodalni spektar naprezanja (Undergraduate thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:159636

Večerić, Sara. "Procjena zamora u vremenskoj i frekvencijskoj domeni za bimodalni spektar naprezanja." Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2021. https://urn.nsk.hr/urn:nbn:hr:235:159636

Večerić, Sara. "Procjena zamora u vremenskoj i frekvencijskoj domeni za bimodalni spektar naprezanja." Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2021. https://urn.nsk.hr/urn:nbn:hr:235:159636

Večerić, S. (2021). 'Procjena zamora u vremenskoj i frekvencijskoj domeni za bimodalni spektar naprezanja', Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 26 November 2024, https://urn.nsk.hr/urn:nbn:hr:235:159636

Večerić S. Procjena zamora u vremenskoj i frekvencijskoj domeni za bimodalni spektar naprezanja [Undergraduate thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2021 [cited 2024 November 26] Available at: https://urn.nsk.hr/urn:nbn:hr:235:159636

S. Večerić, "Procjena zamora u vremenskoj i frekvencijskoj domeni za bimodalni spektar naprezanja", Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2021. Available at: https://urn.nsk.hr/urn:nbn:hr:235:159636

Metadata
TitleProcjena zamora u vremenskoj i frekvencijskoj domeni za bimodalni spektar naprezanja
Title (english)Estimation of fatigue in the time and frequency domains for the bimodal stress spectrum
AuthorSara Večerić
MentorZvonimir Tomičević (mentor)
MentorDamjan Čakmak (komentor)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2021-09-30, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
General Mechanical Engineering (Construction)
Abstract
Ovaj rad bavi se temom zamora materijala uzrokovanog stohastičkim vibracijama. U ovom radu detaljno je opisana Rainflow metoda brojanja ciklusa (metoda „toka kiše“) za ponavljajuću povijest naprezanja. Rainflow metoda za ponavljajuću povijest naprezanja je metoda kojom se pojednostavljuju složene povijesti naprezanja promjenjivih amplituda u niz jednostavnih ciklusa naprezanja konstantnih amplituda što omogućuje proračun zamora. Za duge povijesti naprezanja, proračun visokocikličkog zamora Rainflow metodom u vremenskoj domeni postaje računalno dugotrajan. U svrhu pojednostavljenja, u ovom radu opisane su i korištene spektralne teorije u frekvencijskoj domeni. Na početku rada opisan je fenomen zamornog loma, širenje pukotine u materijalu, Wöhlerova krivulja te S-N metoda proračuna zamora. U drugom dijelu rada detaljno je opisan način brojanja ciklusa nepravilnih amplituda Rainflow metodom za ponavljajuću povijest naprezanja prema ASTM E1049-85 normi. Nadalje, opisane su sve formulacije potrebne za procjenu visokocikličkog zamora u vremenskoj i frekvencijskoj domeni. Detaljno su opisane približne spektralne teorije: Bendat, Dirik, Tovo-Benasciutti i Jiao-Moan. U zadnjem dijelu provedena je analiza rezultata spektralnih teorija s obzirom na dobivene rezultate u vremenskoj domeni. Analiza je provedena pomoću algoritma napisanog u programskom paketu MATLab R2017b.
Abstract (english)
This thesis deals with the topic of material fatigue caused stochastic vibrations. This thesis describes the Rainflow method of cycle counting for repeating stress history. Rainflow method for repeating stress history is a method used to simplify complex variable amplitude stress histories into a series of simple constant amplitude stress cycles that allows fatigue calculation. For long stress histories, the calculation of high-cycle fatigue by the Rainflow method in the time domain becomes computationally time-consuming. For the purpose of simplicity, spectral theories in the frequency domain are also explained and used. At the beginning, the phenomenon of fatigue fracture, crack propagation in the material, Wöhler curve and S-N method of fatigue calculation are described. The second part of the thesis describes the method of counting cycles of irregular amplitudes by the Rainflow method for the repeating stress history according to the ASTM E1049-85 standard. Furthermore, the formulations required to estimate high-cycle fatigue in the time and frequency domains are described. Spectral theories: Bendat, Dirlik, Tovo-Benasciutti and Jiao Moan are also described. The last part analyses and compares the results of spectral theories with the results obtained in the time domain. The analysis was performed using the algorithm written in the software package MATLab R2017b.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:159636
Study programmeTitle: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering
Course: Design
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Embargo expiration date: 2023-09-23
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Created on2021-09-22 20:20:16