20.500.12556/ReVIS-13980 ANALIZA MIKROSTRUKTURNIH SPREMEMB FDM 3D NATISNJENIH POLIMERNIH IN KOMPOZITNIH MATERIALOV IN NJIHOVA POVEZAVA Z MEHANSKIMI LASTNOSTMI ANALYSIS OF MICROSTRUCTURAL CHANGES IN FDM 3D PRINTED POLYMER AND COMPOSITE MATERIALS AND THEIR CORRELATION WITH MECHANICAL PROPERTIES Magistrsko delo obravnava vpliv geometrije in gostote izpolnilne strukture ter izpostavljenosti v mineralnem motornem olju na mehanske in mikrostrukturne lastnosti 3D natisnjenih materialov PLA, PLA+CF, PETG in PETG+CF, izdelanih s FDM tehnologijo. Preizkušanci z različnimi izpolnilnimi geometrijami (linijska, trikotna, heksagonalna) in gostotami so bili analizirani z vidika natezne trdnosti ter mikrostrukturne sestave. Poseben poudarek je bil namenjen oceni poroznosti, vezavi med plastmi in prisotnosti mikrodefektov. Dodatek ogljikovih vlaken je prispeval k izboljšani slojni adheziji in zmanjšal pojav mikrorazpok ter praznin. Rezultati so pokazali, da poleg geometrije in gostote pomembno vlogo pri mehanski odpornosti igra prav mikrostrukturna celovitost materiala, ki je bila izraziteje ohranjena pri kompozitih, tudi po izpostavitvi agresivnemu okolju. Delo prispeva k razumevanju povezav med notranjo zgradbo FDM izdelkov in njihovimi mehanskimi odzivi, kar predstavlja osnovo za optimizacijo parametrov pri aditivni proizvodnji funkcionalnih komponent. This master's thesis investigates the influence of infill geometry and density, as well as exposure to mineral motor oil, on the mechanical and microstructural properties of 3D-printed materials PLA, PLA+CF, PETG, and PETG+CF produced using FDM technology. Test specimens with various infill patterns (linear, triangular, hexagonal) and densities were analysed in terms of tensile strength and internal structural composition. Special attention was given to porosity, interlayer bonding, and the presence of microdefects. The addition of carbon fibers significantly improved layer adhesion and reduced the occurrence of microcracks and voids. The results showed that, in addition to geometry and density, the microstructural integrity of the material plays a crucial role in mechanical performance, which was better preserved in composite materials even after exposure to an aggressive environment. The findings contribute to a deeper understanding of the relationship between internal structure and mechanical behaviour in FDM components, providing a foundation for optimizing parameters in the additive manufacturing of functional parts. aditivna proizvodnja tehnologija z nanašanjem staljenega materiala polimeri in kompoziti mehanske lastnosti mikrostrukturna analiza additive manufacturing fused deposition modelling (FDM) polymers and composites mechanical properties microstructural analysis true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2026-06-03 10:37:47 2026-06-03 10:37:47 2026-06-04 03:14:24 0000-00-00 00:00:00 2025 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 6093 1129$$MAG_Fink__18_04_2025.pdf 1129$$MAG_Fink__18_04_2025.pdf 1 9A39DF6C07D910FAAC2D19C9C407C8D8 efd3f5622aa8706a75a1aeaeb99c0561358b2d5e48e1c9ec9aaff70bf465f5e3 7fbfd7a4-5f27-11f1-9215-001a4af901a5 https://revis.openscience.si/Dokument.php?lang=slv&id=16946 Univerza v Novem mestu - Fakulteta za strojništvo 0 0 0