Introducing auxetic behavior to syntactic foams

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:	2020
Typology:	1.01 - Original Scientific Article
Organization:	UM FS - Faculty of Mechanical Engineering
Publisher:	MDPI
UDC:	539.2:620.1
COBISS:	190687491
ISSN:	2075-4701
Views:	12
Downloads:	0
Average score:	0 (0 votes)
Metadata:

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