Mechanical properties of 3D printed part from PLA material

3D-tisk je proces izdelave izdelka, plast za plastjo. Obsega različne tehnologije. V zaključni nalogi smo se osredotočili na metodo ciljnega nalaganja. Zanimalo nas je, kako stopnja notranje zapolnitve vpliva na mehanske lastnosti izdelka iz materiala PLA. Po standardih za polimerne materiale smo natisnili preizkušance ter nato naredili test na napravah za upogibni in udarni preizkus. Udarno žilavost smo izračunali iz razmerja udarnega dela in površine preseka vzorca na mestu preloma. Pri upogibnem preizkusu smo merili silo in izračunali upogibno napetost. Ugotovitve so bile, da je material PLA krhek. Mehanske lastnosti se višajo z večanjem stopnje zapolnjenosti. Pri manj obremenjenih delih bi zato uporabili minimalne stopnje zapolnitev, medtem ko bi za bolj obremenjene predele uporabili najvišjo stopnjo zapolnitve.3D printing is the process of making a product, layer by layer. It encompasses various technologies. In the final thesis, we focused on the fused deposition modelling. We were interested in how the degree of internal filling affects the mechanical properties of a PLA material. According to the standards for polymeric materials, we printed out the test pieces and then tested them on the devices for bending and impact testing. Impact toughness was calculated from the ratio of the impact part and the cross-sectional area of the specimen at the fracture site. In the bending test the force was measured and the bending tension was calculated. The findings were that PLA material is fragile. The mechanical properties increase as the occupancy rate increases. For less congested parts, therefore, minimum fill rates would be used, while for more congested areas the highest fill rate would be used