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undergraduate thesis
Zamor zavarenih spojeva općenito i procjena zamorne otpornosti prema preporukama IIW-a
Split: University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, 2022. urn:nbn:hr:179:298475
Lišnjić, Luka
University of Split
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture
Department of Mechanical Engineering and Naval Architecture

Institutional repository: Repository of the Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture

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Lišnjić, L. (2022). Zamor zavarenih spojeva općenito i procjena zamorne otpornosti prema preporukama IIW-a (Undergraduate thesis). Split: University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:179:298475

Lišnjić, Luka. "Zamor zavarenih spojeva općenito i procjena zamorne otpornosti prema preporukama IIW-a." Undergraduate thesis, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, 2022. https://urn.nsk.hr/urn:nbn:hr:179:298475

Lišnjić, Luka. "Zamor zavarenih spojeva općenito i procjena zamorne otpornosti prema preporukama IIW-a." Undergraduate thesis, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, 2022. https://urn.nsk.hr/urn:nbn:hr:179:298475

Lišnjić, L. (2022). 'Zamor zavarenih spojeva općenito i procjena zamorne otpornosti prema preporukama IIW-a', Undergraduate thesis, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, accessed 30 June 2024, https://urn.nsk.hr/urn:nbn:hr:179:298475

Lišnjić L. Zamor zavarenih spojeva općenito i procjena zamorne otpornosti prema preporukama IIW-a [Undergraduate thesis]. Split: University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture; 2022 [cited 2024 June 30] Available at: https://urn.nsk.hr/urn:nbn:hr:179:298475

L. Lišnjić, "Zamor zavarenih spojeva općenito i procjena zamorne otpornosti prema preporukama IIW-a", Undergraduate thesis, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Split, 2022. Available at: https://urn.nsk.hr/urn:nbn:hr:179:298475

Metadata
TitleZamor zavarenih spojeva općenito i procjena zamorne otpornosti prema preporukama IIW-a
AuthorLuka Lišnjić
MentorŽeljko Domazet https://orcid.org/0000-0001-5971-9587 (mentor)
GranterUniversity of Split
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture
(Department of Mechanical Engineering and Naval Architecture)
Split
Defense date and country2022-09-22, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Abstract
U ovom radu opisan je najčešći problem trajnosti i kvalitete zavarenih spojeva, a to je zamor materijala. Opisane su sve tri faze zamora, faza začetka pukotine koja sadržava nastanak mikropukotine zbog cikličkih naprezanja, zatim faza širenja pukotine uzrokovana daljnim djelovanjem cikličkih naprezanja i naposlijetku fazu loma kada dođe do pucanja materijala. Nakon toga obrađena je procjena zamorne otpornosti, način na koji se može izbjeći pucanje uslijed zamora. Procjena se vrši na bazi rezultata različitih proračuna i testova. Obrađene su metode procjene na bazi naprezanja u strukturnom žarištu koja se vrši koristeći S-N krivulju ili koristeći referentni detalj. Zatim metoda procjene na bazi efektivnog zareznog naprezanja gdje se leda naprezanje u korijenu usjeka te na spoju zavara i osnovnog materijala. Metoda procjene na bazi analize širenja pukotine u kojoj se koristi Parisov zakon propagacije pukotine. I naposlijetku određivanje zamorne otpornosti testiranjem. Na samom kraju obrađena je i zamorna otpornost spojeva s nepravilnostima u zavaru gdje se najveća pozornost obraća na podrezivanja te poroznost i uključke.
Abstract (english)
This paper describes the most common problem of durability and quality of welded joints, which is material fatigue. All three phases of fatigue are described, the crack initiation phase which includes the formation of microcracks due to cyclic stresses, the crack propagation phase caused by the further action of cyclic stresses and finally the fracture phase when the material breaks. After that, the assessment of fatigue resistance, a way to avoid fatigue cracking, was addressed. The assessment is based on the results of various calculations and tests. Assessment methods based on structural hot spot stresses, which is performed using the S-N curve or using a reference detail, are discussed. Then the assessment method based on the effective notch stress, where the stress is measured at the root of the notch and at the weld toe. Evaluation method based on crack propagation analysis using Paris' power law of crack propagation. And lastly determination of fatigue resistance by testing. At the very end, the fatigue resistance of joints with weld imperfections is treated, where the greatest attention is paid to undercuts, porosity and inclusions.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:179:298475
Study programmeTitle: Mechanical Engineering
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
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Created on2023-05-26 11:00:03