20.500.12556/RUL-108252 Teoretično in eksperimentalno določanje uklonske stabilnosti konzervatorja cilindrične oblike pri vakuumiranju Theoretical and experimental determination of buckling stability of cylindrical conservator during the vacuuming Konzervator je med vakuumiranjem izpostavljen hidrostatičnemu tlaku, kar v primeru pretanke stene povzroči uklon. Tlak, pri katerem pride do uklona, je v veliki meri odvisen od nepravilnosti in poškodb na plašču cilindra. V tem delu smo najprej opravili raziskavo vseh možnih vplivov na uklonsko stabilnost konzervatorja. Nato smo te vplive preverili numerično z metodo končnih elementov v programskem paketu Abaqus 6.131. Rezultate smo preverili z različnimi analitičnimi in empiričnimi enačbami iz literature. Na koncu je opravljen niz tlačnih preizkusov na manjših vzorcih različnih dimenzij ter nekaterimi ojačitvami. Ugotovili smo, da z nelinearno numerično analizo zelo dobro popišemo realno stanje. Do večjih odstopanj pride v primeru ojačanih vzorcev. During the vacuuming, the conservator is subjected to a hydrostatic pressure, which in the case of a thin walls cause buckling. The pressure at which the buckling occurs is largely dependent on the imperfections and damage on the cylinder walls. In this thesis, we first conducted a study of the potential impacts on buckling stability of the conservator. Then we verify these effects numerically with the finite element method in Abaqus 6.131. The results were compared with a variety of analytical and empirical equations from the literature. In the end, a series of pressure tests were carried out on smaller samples of different dimensions and some stiffened. We have found that with a nonlinear numerical analysis we can very well describe the real state. Major deviations occur in the case of stiffened samples. stabilnost uklon lupine cilindri konzervatorji vakuumiranje stability buckling shells cylinders conservators vacuuming true false false [T. Mrzelj] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2019-06-22 07:45:59 2019-06-22 07:46:00 2023-10-20 09:30:25 0000-00-00 00:00:00 2019 0 Ljubljana 0 XXIV, 77 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 531.36:621.52:519.61(043.2) 212412 16678939 3611.pdf 3611.pdf 1 D05FE4B9ADCE5B6075B8B0D4B6B3BBC2 d17ba6de29c1b212f852a5aefbe81509df4393a55fcf4898906ded6f12d6eca9 9afff04c-a1b6-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=119201 Fakulteta za strojništvo 0 0 0