20.500.12556/RUL-160144 Vpliv perturbacij na stabilnost tankostenske valjaste lupine Effect of perturbations on the stability of thin-walled cylindrical shells Cilindrične lupine, ki so izpostavljene aksialni tlačni obremenitvi, lahko glede na svojo maso prenesejo visoko obremenitev, ob dosegu kritične obremenitve pa se uklonijo. Sila, pri kateri pride do uklona, je v veliki meri odvisna od nepravilnosti in poškodb na plašču cilindra. V magistrskem delu smo najprej opravili raziskavo stabilnosti valjastih lupin. Nato smo opravili numerično simulacijo z metodo končnih elementov v programskem paketu Abaqus 6.13-1 in rezultate preverili z analitičnimi enačbami iz literature. V zadnjem delu naloge pa je opravljen niz eksperimetov, kjer aksialno tlačno obremenjujemo vzorce enakih dimenzij kot v simulacijah. Ugotovili smo, da z nelinearno numerično analizo zelo dobro predvidimo stanje pri realnih preizkusih. Cylindrical shells subjected to an axial compressive load can withstand a high load in relation to their mass, but buckle when the critical load is reached. The force at which deflection occurs depends largely on imperfections and damage to the cylinder liner. In this thesis, we first analysed the stability of cylindrical shells. We then simulated these imperfections numerically using the finite element method in the software package Abaqus 6.13-1. The results were checked with analytical equations from the literature. In the last part, a series of experiments were performed in which, samples with the same dimensions as in the simulations were loaded with axial pressure. We found that the non-linear numerical analysis predicts the situation in real tests very well. stabilnost uklon lupine cilindri tlačne napetosti stability buckling shells cylinders compression stresses true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2024-08-22 08:30:54 2024-08-22 08:30:57 2024-12-11 09:15:55 0000-00-00 00:00:00 2024 0 0 XX, 58 str. 2024 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 624.074.433:52-17:53.092(043.2) 263340 218521859 34988.pdf 34988.pdf 1 F5CCB182BD3484EBF549C397E0F4EEF5 293d95f3600dade24d512371cbc96597f9102374182373744b0499c177b56b2a e03a62e4-604f-11ef-8f74-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=188635 Fakulteta za strojništvo 0 0 0