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Title:Avksetične 3D tiskane strukture z geometrijo rotirajočih celic
Authors:ID Kos Krštinc, Vitja (Author)
ID Dobnik-Dubrovski, Polona (Mentor) More about this mentor... New window
ID Novak, Nejc (Comentor)
Files:.pdf VS_Kos_Krstinc_Vitja_2025.pdf (5,53 MB)
MD5: D9288235F9FFEEAB9D8BEFDA1728AEC0
 
Language:Slovenian
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FS - Faculty of Mechanical Engineering
Abstract:Diplomsko delo obravnava razvoj 3D-tiskanih fleksibilnih polimernih avksetičnih struktur, ki predstavljajo alternativo avksetičnim (netkanim) tekstilijam. V procesu načrtovanja izdelka je bilo zasnovanih več avksetičnih struktur z geometrijo rotirajočih kvadratnih celic po motivu , ki so se med seboj razlikovale po strukturni kompleksnosti na treh nivojih. Avksetične strukture so bile izdelane s pomočjo tehnologije 3D-tiska iz termoplastičnega poliuretanskega filamenta in kasneje testirane za vrednotenje njihovega obnašanja pod vplivom natezne obremenitve (pretržna trdnost, pretržni raztezek, Poissonovo število). Deformacije pri natezni obremenitvi avksetičnih struktur so bile posnete s pomočjo kamere za določanje Poissonovega števila. Vsi razviti vzorci so izkazovali negativno Poissonovo število v območju nižjih raztegov (do 50 mm), le vzorec na drugem nivoju strukturne kompleksnosti je izkazoval avksetičnost vse do pretrga. Na rezultate je močno vplivala rotacija celic izven ravnine. Ugotovili smo, da se z naraščanjem strukturne kompleksnosti avksetičnih struktur pretržna sila bistveno ne spreminja (okoli 31 N), medtem ko pretržni raztezek narašča od 68,8 %, preko 107 % do 137 %.
Keywords:avksetične strukture, geometrija rotirajočih celic, računalniško načrtovanje in modeliranje, mehanske lastnosti, Poissonovo število
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[V. Kos Krštinc]
Year of publishing:2025
Number of pages:1 spletni vir (1 datoteka PDF (VII, 67 str.))
PID:20.500.12556/DKUM-95127 New window
UDC:[004.9:677.026.49]+677.017.4
COBISS.SI-ID:275050499 New window
Publication date in DKUM:01.04.2026
Views:197
Downloads:30
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FS
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:05.09.2025

Secondary language

Language:English
Title:Auxetic 3D printed structures with the rotating units geometry
Abstract:The thesis deals with developing 3D printed flexible polymeric auxetic structures as an alternative to auxetic (non-woven) textiles. During the product design process, several auxetic structures with a geometry of rotating square cells based on the alfa motif, were designed, differing in structural complexity at three levels. The auxetic structures were fabricated using 3D printing technology from thermoplastic polyurethane filament and subsequently tested to evaluate their behaviour under tensile loading (breaking strength, breaking elongation, Poisson's number). The deformations under tensile loading of the auxetic structures were recorded using a camera to determine the Poisson's number. All developed specimens showed negative Poisson's number in the lower elongation range (up to 50 mm), only the specimen at the second level of structural complexity showed auxeticity up to the rupture. The results were strongly influenced by the out-of-plane rotation of the cells. We found that the rupture force does not change significantly with increasing structural complexity of the auxetic structures (around 31 N), while the rupture elongation rises from 68.8%, through 107% to 137%.
Keywords:auxetic structures, geometry of rotating cells, computer design and modelling, mechanical properties, Poisson's number


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