20.500.12556/RUL-99581 Napoved dobe trajanja dinamično obremenjenega spoja med cevjo in ročico Life time prediction of dynamically loaded welded joint between tube and connecting bar V sodobnem projektiranju imamo veliko konstrukcij z zvarnimi spoji, ki predstavljajo kritična mesta in so podvrženi dinamičnim obremenitvam. Varjene konstrukcije še vedno predstavljajo enega najpogostejših načinov spajanja nosilnih elementov v serijskih proizvodnjah. Da bi se izognili poškodbam in porušitvam konstrukcij, so se skozi čas razvile različne metode določevanja poškodbe za varjene konstrukcije. V magistrski nalogi so predstavljene metode določevanja dobe trajanja zvarnih spojev s pomočjo Smith-Watson-Topperjevega (SWT) parametra, z metodo geometrijskih napetosti po standardu EUROCODE 3-1.9, s klasičnim preračunom po standardu EUROCODE 3-1.9 in s pomočjo specializiranega računalniškega programa FEMFAT. V primerjavi z realnimi fizičnimi testi smo ugotovili, da program FEMFAT napove dobo trajanja zvarnih spojev najbolj točno, vendar podobno kakor ostale metode nekoliko konzervativno. There exists a large number of structures with welding joints that represent critical spots and are subjected to dynamic loads in modern designing. Welded structures are still presented as one of the most commonly used methods for joining supporting elements in serial productions. To avoid structural damage and collapse of joints several methods for the evaluation and detection of damage in welded structures have been developed. In this master's thesis, several methods for the prediction of the life time of welding are presented that are based on the (i) Smith-Watson-Topper (or SWT) parameter, (ii) method of geometric tension in accordance with standard EUROCODE 3-1.9, (iii) standard calculation based on EUROCODE 3-1.9 and (iv) use of the specialized computer program FEMFAT. In comparison with real physical tests it can be concluded that FEMFAT in spite of conservative predictions makes the best life time predictions for welding joints. doba trajanja zvarnih spojev veliko-ciklično utrujanje numerična analiza konstrukcijski detajl zvara geometrijska napetost durability of welded joint long cycle fatigue life numerical analysis strucural detail of the weld hot-spot stresses true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2018-02-06 07:15:34 2018-02-06 07:15:39 2023-10-18 11:40:06 0000-00-00 00:00:00 2018 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 2019-02-02 204306 1464.pdf 1464.pdf 1 C434C80E96907761C63DE30D3262D8AB 1c7210f1c973835dce5b4ccbe433d47eb50c6e43dafc383b9ea2803fb626b1cd 99e986db-a1b4-11eb-a523-00155dcfd717 20.500.12556/rul/0471b808-8bfb-4845-bb79-ea31896e9507 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=109100 Fakulteta za strojništvo 0 0 0