20.500.12556/DKUM-99324 Eksperimentalna in numerična analiza lokalne nestabilnosti medicinske endotrahealne cevke magistrsko delo Experimental and numerical analysis of local instability in an endotracheal tube V magistrskem delu sta predstavljeni eksperimentalna in numerična analiza mehanskega odziva štirih različnih endotrahealnih cevk, dveh različnih proizvajalcev, pri temperaturah 22 °C in 37 °C. Namen raziskave je bil proučiti pojav lokalne nestabilnosti oziroma prepogiba cevke med tlačnim preizkusom in razviti numerični model, ki bi ponovil dogajanje med realnim eksperimentom. V eksperimentalnem delu smo zasnovali preizkusni sistem, s katerim smo izvedli meritve sile glede na pomik. Na podlagi eksperimentalnih rezultatov smo v programskem okolju ANSYS izdelali numerični model po metodi končnih elementov. Model je vključeval ustrezne robne pogoje, kontaktne interakcije ter kalibrirane materialne lastnosti. Rezultati so pokazali, da temperatura pomembno vpliva na mehanski odziv endotrahealnih cevk, saj se pri telesni temperaturi njihova togost zmanjša, s čimer se poveča možnost nastanka prepogiba. Validacija numeričnega modela je pokazala dobro ujemanje z eksperimentalnimi rezultati v začetnem (linearnem) naraščanju sile in pomika. Numerični model je uspešno napovedal tudi deformirano obliko cevk in najverjetnejša mesta največjih napetosti. This master’s thesis presents an experimental and numerical analysis of the mechanical response of four different endotracheal tubes produced by two manufacturers at temperatures of 22 °C and 37 °C. The aim of the study was to investigate the occurrence of local instability, or tube kinking, during a compression test and to develop a numerical model capable of reproducing the behaviour observed in the experiment. In the experimental part, a test system was designed to measure force as a function of displacement. Based on the experimental results, a finite element model was developed in ANSYS. The model included appropriate boundary conditions, contact interactions, and calibrated material properties. The results showed that temperature has a significant influence on the mechanical response of endotracheal tubes. At body temperature, their stiffness decreases, which increases the likelihood of kinking. Validation of the numerical model showed good agreement with the experimental results in the initial region of the force–displacement response. The numerical model also successfully predicted the deformed shape of the tubes and the most likely regions of maximum stresses. endotrahealna cevka metoda končnih elementov lokalna nestabilnost numerična simulacija eksperimentalna analiza endotracheal tube finite element method tube kinking numerical simulation experimental analysis true true false [D. Fijavž] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2026-08-12 19:39:02 2026-09-02 10:31:17 2026-09-23 03:08:23 0000-00-00 00:00:00 2026 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (X, 54 f.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.173/.174:615.477.8(043.2) 291925251 MAG_Fijavz_David_2026.pdf MAG_Fijavz_David_2026.pdf 1 94E04940BE7818E1AFF67074FD57B57C 6bedc5e7b86c6b5e217b5429c6b99adfd774c3c12e2521464fc4d6dc77e821f7 1eac1d33-a54a-11f1-b1f1-00155d0001be https://dk.um.si/Dokument.php?lang=slv&id=211060 Fakulteta za strojništvo 0 0 0