diplomsko delo
Ernest Strgar (Avtor), Tomaž Lampe (Recenzent), Andrijana Sever Škapin (Mentor), Janez Slapnik (Komentor)

Povzetek

Uvod: 3D-tiskanje je hitro razvijajoča se napredna tehnologija izdelave tridimenzionalnih trdnih objektov, ki vse bolj pridobiva na pomenu v industriji, kot tudi na medicinskem področju. Njegova glavna prednost je možnost izdelave cenovno ugodnih in funkcionalnih delov z različnimi lastnostmi. Najpogosteje uporabljena tehnologija 3D tiska je modeliranje s spajanjem slojev ali »fused deposition modeling« (FDM) tehnologija. Na kvaliteto 3D tiskanih izdelkov imajo velik vpliv parametri tiskanja ter material, ki ga uporabljamo. Med najpogosteje uporabljenimi materiali za FDM so polimlečna kislina (PLA), akrilonitril butadien stiren (ABS), polietilen tereftalat (PET), termoplastični poliuretan (TPU) ter kompozitni materiali, ki so vsestranski, imajo majhno težo in prilagodljive lastnosti. Primer takih kompozitnih materialov so polimerni kompoziti, ojačani z ogljikovimi vlakni. Namen: Namen je raziskati in analizirati vpliv različnih vsebnosti ogljikovih vlaken na mehanske lastnosti 3D tiskanega polimernega kompozita na osnovi termoplastičnega poliuretana, ter primerjati mehanske lastnosti vzorcev, pripravljenih z dvema različnima tehnologijama: s 3D tiskanjem in s klasično tehnologijo brizganja. Metode dela: Različne deleže ogljikovih vlakne (10 mas.%, 15 mas.% in 20 mas.%) smo kompavndirali v TPU matrico z dvopolžnim korotirajočim ekstruderjem. Iz pripravljenih kompozitnih materialov smo pripravili filamente za 3D tisk z enopolžnim ekstruderjem. Preizkušance za testiranje mehanskih lastnosti smo pripravili z brizganjem in FDM 3D tiskom in jih okarakterizirali z nateznim preizkusom ter trdoto po Shore A. Rezultati: Največja izmerjena trdota po Shore A je bila 90 pri TPU+CF20, najmanjša pa pri čistem TPU (80) 3D tiskanih preizkušancev . Natezna trdnost in Youngov modul sta rastla z večanjem vsebnosti ogljikovih vlaken. Največjo natezno trdnost in Youngov modul je imel TPU+CF20, najmanjšo pa neojačen TPU, razen pri brizganih preizkušancih, kjer je imel največjo natezno vrednost neojačan TPU. Nasprotno pa je relativni raztezek padal z večanjem vsebnosti ogljikovih vlaken: največji raztezek pri pretrgu je dosegel TPU, najmanjšega pa TPU+CF20 tako pri 3D tiskanih in brizganih preizkušancih. Razprava in zaključek: Ugotovili smo, da delež ogljikovih vlaken vpliva na mehanske lastnosti natisnjenih kompozitnih vzorcev na osnovi TPU 3D tiskanih preizkušancev. Z višjo vsebnostjo ogljikovih vlaken so naraščali natezna trdnost, Youngov modul in trdota. Z večanjem deleža dodanih vlaken pa je padala razteznost in elastičnost materiala.

Ključne besede

diplomska dela;ortotika in protetika;aditivna tehnologija;3D tiskanje;modeliranje s spajanjem slojev (FDM);kompoziti;termoplastičen poliuretan;ogljikova vlakna;mehanske lastnosti;

Podatki

Jezik: Slovenski jezik
Leto izida:
Tipologija: 2.11 - Diplomsko delo
Organizacija: UL ZF - Zdravstvena fakulteta
Založnik: [E. Strgar]
UDK: 617.3
COBISS: 222763523 Povezava se bo odprla v novem oknu
Št. ogledov: 25
Št. prenosov: 0
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Angleški jezik
Sekundarni naslov: ǂThe ǂimpact of carbon fiber on the mechanical properties of 3D-printed thermoplastic polyurethane
Sekundarni povzetek: Introduction: 3D printing is a rapidly evolving advanced technology for the production of three-dimensional solid objects, gaining increasing importance in industry and the medical field. Its main advantage lies in the ability to produce cost-effective and functional parts with various properties. The most commonly used 3D printing technology is fused deposition modeling (FDM). The quality of 3D-printed products is significantly influenced by printing parameters and the materials used. Among the most commonly employed materials for FDM are polylactic acid (PLA), acrylonitrile butadiene styrene (ABS), polyethylene terephthalate (PET), thermoplastic polyurethane (TPU), and composite materials, which are versatile, lightweight, and flexible. An example of such composite materials is polymer composites reinforced with carbon fibers. Purpose: The aim is to investigate and analyze the impact of different carbon fiber contents on the mechanical properties of 3D-printed polymer composites based on thermoplastic polyurethane (TPU) and to compare the mechanical properties of samples prepared using two different technologies: 3D printing and conventional injection molding. Methods: Different carbon fiber contents (10 wt.%, 15 wt.%, and 20 wt.%) were compounded into the TPU matrix using a twin-screw co-rotating extruder. Filaments for 3D printing were prepared from the composite materials using a single-screw extruder. Test specimens for mechanical property evaluation were produced by injection molding and FDM 3D printing. The specimens were characterized through tensile testing and Shore A hardness measurements. Results: The highest measured Shore A hardness was 90 for TPU+CF20, while the lowest value of 80 was observed for pure TPU in the 3D-printed specimens. Tensile strength and Young’s modulus increased with higher carbon fiber content. TPU+CF20 exhibited the highest tensile strength and Young’s modulus, while the lowest values were found in unreinforced TPU, except in the case of injection-molded specimens, where the unreinforced TPU demonstrated the highest tensile strength. In contrast, elongation at break decreased with increasing carbon fiber content: TPU exhibited the highest elongation at break, while TPU+CF20 showed the lowest values in both 3D-printed and injection-molded specimens. Discussion and conclusion: We found that the carbon fiber content significantly affects on the mechanical properties of TPU-based 3D printed composite samples. Higher carbon fiber content led to increased tensile strength, Young’s modulus, and hardness. However, higher fiber content resulted in reduced elongation and elasticity of the material.
Sekundarne ključne besede: diploma theses;orthotics and prosthetics;technology;3d printing;fused deposition modeling (FDM);composites;termoplastic polyurethane;carbon fiber;mechanical properties;
Vrsta dela (COBISS): Diplomsko delo/naloga
Študijski program: 0
Komentar na gradivo: Univ. v Ljubljani, Zdravstvena fak., Oddelek za protetiko
Strani: 41 str.
ID: 25715229