Nejc Novak (Author), Miha Kolar (Author), Nima Movahedi (Author), Matej Vesenjak (Author), Zoran Ren (Author), Thomas Fiedler (Author)

Abstract

This paper 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.

Keywords

avksetične celične strukture;sintaktične pene;eksperimentalni testi;mehanske lastnosti;auxetic cellular structure;syntactic foams;experimental tests;mechanical properties;Poisson’s ratio;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: MDPI
UDC: 539.2:620.1
COBISS: 190687491 Link will open in a new window
ISSN: 2075-4701
Views: 222
Downloads: 30
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Other data

Secondary language: Slovenian
Secondary keywords: avksetične celične strukture;sintaktične pene;eksperimentalni testi;mehanske lastnosti;
Type (COBISS): Article
Pages: 12 str.
Volume: ǂVol. ǂ14
Issue: ǂiss. ǂ4, [article no.] 387
Chronology: March 2024
DOI: 10.3390/met14040387
ID: 23281704