20.500.12556/DKUM-95720 Strižna trdnost lotnih spojev toplotnih izmenjevalcev magistrsko delo Shear strength of brazed joints of heat exchangers V magistrski nalogi smo obravnavali strižno trdnost lotnih spojev toplotnih izmenjevalcev, ki so bili izdelani iz nerjavnega jekla in spojeni s postopkom vakuumskega lotanja. V okviru naše raziskave so bili izvedeni statični in dinamični strižni testi, katerih rezultati so nam podali materialne lastnosti spoja in S-N diagram življenjske dobe. V nadaljevanju je bila izvedena metalografska analiza na nepretrganem vzorcu in vzorcu s statično ter dinamično obremenitvijo. Pri tem smo izvedli tudi meritev mikrotrdote na osnovnem materialu in v okolici spoja. Na vzorcih, ki so bili utrujani, pa smo izvedli še fraktografsko analizo v kombinaciji z EDS analizo mikrostrukture. S pomočjo analiz smo uspeli povezati mehanske lastnosti spojev z njihovo mikrostrukturo in opredeliti vpliv difuzije, utrjevanja ter morebitnih napak v spoju z njihovo nosilnostjo in življenjsko dobo. In our master's thesis, we discussed the shear strength of soldered joints of heat exchangers, which were made of stainless steel and joined using a vacuum soldering process. As part of our research, static and dynamic shear tests were performed, the results of which provided us with the material properties of the joint and the S-N diagram of its service life. Subsequently, metallographic analysis was performed on an original sample and samples with static and dynamic loads. We also performed microhardness measurements on the base material and in the vicinity of the joint. A fractographic analysis in combination with EDS analysis was later performed on fatigued samples. With the help of the analyses, we managed to connect the mechanical properties of the joints with their microstructure and define the influence of diffusion, hardening and possible defects in the joint, on their load-bearing capacity and service life. toplotni izmenjevalec lotni spoj statični in dinamični strižni testi metalografska analiza fraktografska analiza mikrotrdota heat exchangers brazed joint static and dynamic shear tests metallographic analysis fractographic analysis microhardness true true false [Ž. Dvoršak] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2025-10-14 22:02:21 2025-11-11 12:56:01 2025-11-28 03:08:22 0000-00-00 00:00:00 2025 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (XIII, 52 f.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.176:621.791.3.052(043.2) 258885379 MAG_Dvorsak_Zan_2025.pdf MAG_Dvorsak_Zan_2025.pdf 1 CA9EF9C08BBB31BC5569D31A6565D4A6 31c061d89187fd06f8f9805d45fde52f9322cf9cff946b97eaa6d0b3b764e504 65389910-be5a-11f0-8bb8-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=200524 Fakulteta za strojništvo 0 0 0