20.500.12556/RUL-185901 Numerična analiza napetostnega stanja vijačnih zvez pri različnih prekritjih navoja in načinih simuliranja Numerical analysis of the stress distribution of bolted joints with different thread overlaps and simulation approaches Natančnost numeričnih simulacij vijačnih zvez je odvisna od pravilnega modeliranja geometrije navoja in izbire numeričnega modela. Zaradi tolerančnih odstopanj pri izdelavi navojev ter različnih pristopov modeliranja lahko pride do pomembnih razlik v napetostnem stanju, zato je pomembno ovrednotiti vpliv navedenih dejavnikov na natančnost napovedovanja napetosti in porazdelitve obremenitev v vijačni zvezi. Obravnavana je bila vijačna zveza vijaka in matice z navojem M20×2,5 mm in trdnostnim razredom 10.9, izdelana v skladu s predpisanimi standardi ISO. Analiza z metodo končnih elementov je bila izvedena s pomočjo programskih orodij SolidWorks in Abaqus. Izdelani so bili trije numerični modeli: osno simetrični model, osno simetrični model s prirobnicami in tridimenzionalni model, pri katerih so bila analizirana različna prekritja navoja. Rezultati so pokazali, da zmanjševanje prekritja navoja povzroči povečanje lokalnih napetosti v korenu prvih nosilnih zob navoja ter poveča možnost plastičnih deformacij in iniciacije razpok. Primerjava modelov pa je pokazala, da tridimenzionalni model zaradi upoštevanja vijačnice navoja in možnosti analize ekscentričnih obremenitev natančneje opiše dejansko obnašanje vijačne zveze. The accuracy of numerical simulations of bolted joints depends on the correct modelling of thread geometry and the selection of an appropriate numerical model. Manufacturing tolerances and different modelling approaches may lead to significant differences in the stress state; therefore, it is important to evaluate the influence of these factors on the accuracy of predicting stress distribution and load transfer within a bolted joint. The analyzed bolted joint consisted of an M20×2,5 mm bolt and nut of property class 10.9, designed in accordance with the relevant ISO standards. Finite element analysis was performed using SolidWorks and Abaqus software. Three numerical models were developed: an axisymmetric model, an axisymmetric model with flanges, and a three-dimensional model, in which different thread overlap conditions were analyzed. The results showed that reducing thread overlap increases local stresses at the roots of the first load-bearing threads, thereby increasing the likelihood of plastic deformation and crack initiation. Furthermore, the comparison of the models demonstrated that the three-dimensional model provides a more accurate representation of the actual behavior of the bolted joint by accounting for the thread helix and enabling the analysis of eccentric loading. vijačne zveze navoji metoda končnih elementov numerične analize prekritje navoja napetostno stanje kontaktni tlak bolted joints threads finite element method numerical analyses thread overlap stress state contact pressure true false false [J. Osolnik] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-08-22 08:31:06 2026-08-22 08:31:19 2026-09-01 09:48:17 0000-00-00 00:00:00 2026 0 Ljubljana 0 XX, 52 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.172.21:621.882:519.6(043.2) 288192 288817667 48600.pdf 48600.pdf 1 0F1802554E02EA3AAA1B8CDB023B9E22 b8ab1959638ebb840054f71c7aeffd0251e60fc0c6bc4513618efb34734fd15e b0e4a331-9df2-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=244908 Fakulteta za strojništvo 0 0 0