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Title:Deformacija avksetičnih struktur pri upogibni obremenitvi : diplomsko delo
Authors:ID Zbičajnik, Mitja (Author)
ID Vesenjak, Matej (Mentor) More about this mentor... New window
ID Novak, Nejc (Comentor)
Files:.pdf UN_Zbicajnik_Mitja_2018.pdf (3,92 MB)
MD5: D9D03E846BF70302BE7E724745F7E296
PID: 20.500.12556/dkum/c489f5a1-c009-4973-9baf-ae64b3e41d91
 
Language:Slovenian
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FS - Faculty of Mechanical Engineering
Abstract:V diplomskem delu se poglobimo v področje avksetičnih celičnih materialov. Opisane so lastnosti avksetičnih celičnih struktur, deformacije pri osni obremenitvi in pri upogibni obremenitvi. Navedenih in opisanih je več vrst avksetičnih struktur. Namen naloge je ugotoviti deformiranje avksetičnih struktur pri upogibni obremenitvi v primerjavi s konvencionalnimi strukturami, ki izkazujejo pozitivno Poissonovo razmerje. V ta namen smo pripravili modele treh avksetičnih struktur: vbočeno satovje, kiralno strukturo in strukturo manjkajočih reberter dve konvencionalni geometriji s šestkotno (satovje) in štirikotno (rešetka) strukturo. Vsem smo določili enake materialne lastnosti in jih v programskem paketu Abaqus CAE, upogibno obremenili ter analizirali po metodi končnih elementov. Določili smo ustrezno velikost mreže in preverili vpliv anizotropije ter debeline sten na rezultate simulacije. V rezultatih simulacij smo sledili pomike neobremenjenih delov strukture in jih primerjali med strukturami. Ugotovili smo, da se avksetične strukture obnašajo drugače od konvencionalnih kadar jih upogibno obremenimo. Le-te izkazujejo bolj sinklastično deformiranje kot konvencionalne strukture in izrazito pokažejo vpliv avksetičnosti na deformiranje pri upogibni obremenitvi.
Keywords:avksetične strukture, celični materiali, negativno Poissonovo razmerje, Abaqus CAE, numerične simulacije, metoda končnih elementov
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[M. Zbičajnik]
Year of publishing:2018
Number of pages:IX, 30 f.
PID:20.500.12556/DKUM-71951 New window
UDC:539.2/.3(043.2)
COBISS.SI-ID:22225430 New window
NUK URN:URN:SI:UM:DK:7MREVLUC
Publication date in DKUM:20.09.2018
Views:1733
Downloads:199
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:05.09.2018

Secondary language

Language:English
Title:Deformation of auxetic structures under bending load
Abstract:In the diploma work, we focus on the field of auxetic cellular materials. Properties of the auxetic cell structures and the deformation mechanism sunder axial load, as well as under bending load are described. Several types of auxetic structures are presented. The purpose of this assignment is to determine the deformation of the auxetic structures under bending load, compared to the conventional structures with positive Poisson's ratio. To this end, we prepared models of three auxetic structures: auxetic honeycombs, chiral structure and missing rib structure, aswell as two conventional geometries with hexagonal (honeycomb) and square (grid) structure. We defined the same material properties for each of them and subjected them to bending load. Simulations are performed and analysed in software package Abaqus CAE based on the finite elements method. We determined the suitable size of the mesh of finite elements and observed the influence of anisotropy and wall thickness on the simulation results. We focused on the displacement of the unloaded corners of the structure and we compared different structures. We have found that auxetic structures behave differently from the conventional when structures are exposed to bending load. The former express more synclastic deformation than conventional structures and show the influence of the auxetic properties on deformation under bending load.
Keywords:auxetic structures, cellular materials, negative Poisson’s ratio, Abaqus CAE, numerical simulations, finite element method


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