20.500.12556/RUL-147116 3D printanje in FE analiza termoplastičnih enosmernih kompozitov z dolgimi vlakni 3D printing and FE analysis of thermoplastic unidirectional composites with long fibers V nalogi obravnavamo vpliv tehnologije 3D tiskanja termoplastičnih kompozitov, ojačanih z dolgimi enosmernimi steklenimi vlakni na natezno in upogibno trdnost, ter primerjamo rezultate, dobljene z eksperimentalnim testiranjem in numeričnim simuliranjem. V prvem delu naloge smo analizirali materialne lastnosti osnovnega materiala in vlaken. Določili smo materialne parametre in izračunali elastične parametre za popis ortotropnih lastnosti ojačitvenih vlaken s semiempiričnim Chamijevim modelom. Zatem smo določili geometrijo testnih preizkušancev, kjer smo opazovali vpliv tiskane smeri, in geometrijo kompozitnih preizkušancev, pri katerih smo upoštevali izmenično in zgoščeno razporeditev ojačitev po prerezu. Nastale natisnjene preizkušance smo obremenjevali na nateg in upogib ter opazovali njihov odziv. Dobljene rezultate smo primerjali z rezultati numeričnih simulacij, kjer smo vrednotili ojačitve z metodo membran, metodo nosilcev in metodo kompozitne postavitve. S primerjavo rezultatov smo ugotovili, da ima tehnologija 3D tiskanja velik vpliv na končno trdnost kompozita, kjer zaradi šibkega stika med matrico in vlaknom prihaja do razslojevanja. We investigate the impact of 3D printing technology of thermoplastic composites reinforced with long unidirectional glass fibers on the tensile and bending strength, where we compare the results obtained by experimental testing and numerical simulation. In the first part of the assignment, we analysed the material properties of the base material and fibers. We determined the material parameters and calculated the elastic parameters for orthotropic properties of the reinforcing fibers using the semi-empirical Chamis model. After that, we determined the geometry of the test specimens, where we observed the influence of the printed direction, and the geometry of the composite specimens, where we considered the alternating and condensed distribution of reinforcements across the cross-section. The resulting printed test pieces were subjected to tension and bending, and their response was observed. The obtained results were compared with the results of numerical simulations, where reinforcements were evaluated using the membrane method, the beam method and the composite layout method. By comparing the results, we found that the 3D printing technology has a great influence on the final strength of the composite, where delamination occurs due to the weak contact between the matrix and the fiber. 3D tiskanje termoplastični kompoziti dolga enosmerna vlakna steklena vlakna FE analiza numerična simulacija 3D printing thermoplastic composites long unidirectional fibers glass fibers FE analysis numerical simulation true false false [A. Trofenik] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2023-06-23 08:31:01 2023-06-23 08:31:05 2023-12-01 14:14:45 0000-00-00 00:00:00 2023 0 Ljubljana 0 XXII, 83 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 004.925.84:621.79:678.073(043.2) 250321 156607491 23452.pdf 23452.pdf 1 15197D03E5779448F9893A1AA4A97EF0 e0912263e070cb9e4c2b54d8c519bbb978de9aff283cbf7622d986eaa6dde6f3 2696a191-118f-11ee-a314-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=170505 Fakulteta za strojništvo 0 0 0