A1 Journal article (refereed), original research

A Finite Element Study to Investigate the Mechanical Behaviour of Unidirectional Recycled Carbon Fibre/Glass Fibre–Reinforced Epoxy Composites

Open Access publication

Publication Details

Authors: Karuppannan Gopalraj Sankar, Kärki Timo

Publisher: MDPI

Publication year: 2021

Language: English

Related journal or series: Polymers

Volume number: 13

Issue number: 18

Start page: 1

End page: 25

Number of pages: 25

eISSN: 2073-4360

JUFO level of this publication: 1

Digital Object Identifier (DOI): http://dx.doi.org/10.3390/polym13183192

Permanent website address: https://www.mdpi.com/2073-4360/13/18/3192

Open Access: Open Access publication


Recycled carbon fibre–reinforced epoxy (rCF/EP) composites and recycled
glass fibre–reinforced epoxy (rGF/EP) composites were numerically
investigated to examine their mechanical properties, such as uniaxial
tensile and impact resistance, using finite element (FE) methods. The
recycled composites possess unidirectional, long and continuous fibre
arrangements. A commercially available Abaqus/CAE software was used to
perform an explicit non-linear analysis with a macroscale modelling
approach, assuming the recycled composites as both homogenous and
isotropic hardening. Five composite types were subjected to a numerical
study based on the recycled fibre’s volume fraction (40 and 60%) of
rCF/EP and rGF/EP, along with (100%) fibreless cured epoxy samples. The
materials were defined as elastoplastic with a continuum ductile damage
(DUCTCRT) model. The experimental tensile test results were processed
and calibrated as primary input data for the developed FE models. The
numerical tensile results, maximum principal stress and logarithmic
strain were validated with their respective experimental results. The
stress–strain curves of both results possess a high accuracy, supporting
the developed FE model. The numerical impact tests examined the von
Mises stress distribution and found an exponential decrease in the
stiffness of the composite types as their strength decreased, with the
60% rCF/EP sample being the stiffest. The model was sensitive to the
mesh size, hammer velocity and simulation time step. Additionally, the
total internal energy and plastic dissipation energy were measured, but
were higher than the experimentally measured energies, as the FE models
eliminated the defects from the recycled process, such as a poor fibre
wettability to resin, fibre bundle formation in rCFs and char formation
in rGFs. Overall, the developed FE models predicted the results for a
defect-free rCF/EP and rGF/EP composite. Hence, the adopted modelling
techniques can validate the experimental results of recycled composites
with complex mechanical properties and damage behaviours in tensile and
impact loading conditions.

Last updated on 2021-21-09 at 12:56