diplomsko delo
Miha Kolar (Author), Nejc Novak (Mentor)

Abstract

Prispevek predlaga inovativen večmaterialen pristop za vpeljavo avksetičnega obnašanja v področje sintaktičnih pen. Z natančnim oblikovanjem velikosti, oblike in orientacije sintaktične pene je bilo doseženo avksetično deformacijsko obnašanje. Najprej so bili iz ekspandiranega perlita in mavca izdelani šestkotni elementi v obliki peščene ure, nato pa je bil avksetični vzorec teh elementov razporejen v škatlo iz nerjavnega jekla. Prazni prostori med vložki so bili zapolnjeni z aluminijevo zlitino (A356) s pomočjo uporabe tehnike proti gravitacijskega litja. Vliti avksetični kompozit je imel gostoto 1,52 g/cm3. Izdelan preizkušanec je bil nato deformiran s kvazi-statično obremenitvijo, da bi lahko okarakterizirali njegovo deformacijsko obnašanje in določili njegove mehanske lastnosti, zlasti Poissonovo število. Deformacija kompozita je bila avksetična s Poissonovim številom -1,04. Za boljše razumevanje mehanizma in zagotavljanje možnosti za nadaljnjo optimizacijo geometrije so bile izvedene računalniške simulacije po metodi končnih elementov.

Keywords

avksetične celične strukture;sintaktične pene;eksperimentalno testiranje;mehanske lastnosti;Poissonovo število;diplomske naloge;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: [M. Kolar]
UDC: 620.17:620.168(043.2)
COBISS: 218508035 Link will open in a new window
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Other data

Secondary language: English
Secondary title: Characterization of deformation and mechanical behaviour of the auxetic composite metamaterial
Secondary abstract: This thesis proposes an innovative multi-material approach for introducing auxetic behaviour to syntactic foams (SFs). By carefully designing the size, shape, and orientation of the SFs, auxetic deformation behaviour was induced. Re-entrant hexagon-shaped SF elements were fabricated using expanded perlite (EP) particles and a plaster of Paris slurry first. Then an auxetic pattern of these SF elements was arranged within a stainless-steel casting box. The empty spaces between the SF elements were filled with molten aluminium alloy (A356) using the counter-gravity infiltration casting technique. The cast auxetic composite had a bulk density of 1.52 g/cm3 . The cast composite was then compressed under quasi-static loading to characterise its deformation behaviour and to determine the mechanical properties, especially the Poisson’s ratio. The cast composite deformation was auxetic with a Poisson’s ratio of −1.04. Finite Element (FE) simulations were conducted to understand the deformation mechanism better and provide means for further optimisation of the geometry.
Secondary keywords: Auxetic cellular structures;syntactic foams;experimental testing;mechanical properties;Poisson’s ratio;
Type (COBISS): Bachelor thesis/paper
Thesis comment: Univ. v Mariboru, Fak. za strojništvo, Konstrukterstvo
Pages: 1 spletni vir (1 datoteka PDF (IX, 26 f.))
ID: 24571912