Upogibne lastnosti 3D tiskanih poroznih struktur vzorcev polilaktične kisline

zaključna naloga Univerzitetnega študijskega programa I. stopnje Strojništvo - Razvojno raziskovalni program

Gašper Stanič Gruden (Author), Lidija Slemenik Perše (Mentor)

Abstract

Rešetke so posebne strukture materialov, ki se pogosto uporabljajo v sodobni biomedicin-ski, gradbeni in drugih industrijah. Raziskave so pokazale, da imajo različne celice, ki sestavljajo rešetke, tudi različne vplive na mehanske in termične lastnosti končnega izdelka. Rešetke je mogoče izdelovati iz raznih materialov, v praksi pa se pretežno uporabljajo poli-meri. Za izdelavo rešetk je na voljo več industrijskih postopkov, med drugim tudi postopek 3D tiska - modeliranje taljenega nanosa (FDM), ki smo ga uporabili tudi mi. Pri njem gre za nanašanje termoplastičnih polimerov plast za plastjo na površino. Produkt je odvisen od več parametrov tiska, zato jih je potrebno predhodno natančno določiti. Pri pripravi naloge je bil opravljen tri točkovni upogibni preizkus izbranih vzorcev polilaktične kisline (PLA), s pou-darkom na dveh strukturah rešetk: satovje in kogame. Pri tem je bil proučevan vpliv gostote in vrste celic rešetk na mehanski odziv vzorcev pod upogibno napetostjo. Mehanski testi so pokazali velike razlike v odzivu PLA glede na strukturo rešetke, pri čemer je višja gostota celic pomenila izboljšanje določenih mehanskih lastnosti vzorca. Ugotovljeno je bilo, da rešetka kogame izkazuje odlično togost, primerljivo polnim vzorcem, vendar krhko struktu-ro. Rešetka satovja pa se po drugi strani ponaša z odličnim povesom in prenašanjem upo-gibnih momentov, a hkrati tudi z nižjo natezno trdnostjo.

Keywords

polilaktična kislina;PLA;FDM;strukture rešetk;tri točkovni upogibni preizkus;mehanske lastnosti;rešetka satovja;heksagonalne rešetka;rešetka kogame;zvezdasta rešetka;

Data

Language:	Slovenian
Year of publishing:	2024
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[G. Stanič Gruden]
UDC:	620.174:539.3:004.942(043.2)
COBISS:	187985667
Views:	12
Downloads:	4
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Bending properties of 3D printed porous structure of Polylactic acid samples
Secondary abstract:	Lattices are special material structures that are widely used in modern biomedical, construc-tion and other industries. Research has shown that different cells constituting the lattices also have different effects on mechanical and thermal properties of the final product. Latti-ces can be made from a variety of materials, but in practice polymers are predominantly used. Several industrial processes are available for the production of lattices, including 3D printing - Fused Deposition Modelling (FDM), witch was also used in our research. It in-volves applying thermoplastic polymers layer by layer to a surface. The product depends on several parameters, which need to be precisely defined in advance. In present study, a three-point bending experiment of selected Polylactic Acid (PLA) samples was carried out, focusing on honeycomb and kogame lattices. The influence of density and cell type of grids on the mechanical response of samples under bending stress was investigated. Mechanical tests showed large differences in response of PLA depending on lattice struc-ture with higher cell densities resulting in an improvement in certain mechanical properties. Kogame lattices were found to exhibit excellent stiffness, comparable to solid samples, but a brittle structure. Honeycomb lattices on the other hand, have excellent deflection and bending moment transmission, but also lower tensile strength.
Secondary keywords:	polyactic acid;PLA;fusion deposition modeling;lattice structures;three point bending test;mechanical properties;honeycomb structures;heksagonal structures;kogame structures;star shaped structures;
Type (COBISS):	Final paper
Study programme:	0
Thesis comment:	Univ. v Ljubljani, Fak. za strojništvo
Pages:	XII, 62 f.
ID:	23081032