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Materials 2015, 8(11), 7371-7388; doi:10.3390/ma8115384

Thermo-Mechanical Behaviour of Flax-Fibre Reinforced Epoxy Laminates for Industrial Applications

1
Dip. di Ingegneria Chimica, Università degli Studi di Palermo, Gestionale, Informatica, Meccanica (DICGIM), Palermo 90128, Italy
2
Facoltà di Ingegneria e Architettura, Università degli Studi di Enna “Kore”, Enna 94100, Italy
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Marco Morreale
Received: 30 September 2015 / Accepted: 28 October 2015 / Published: 3 November 2015
(This article belongs to the Special Issue Green Composites)
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Abstract

The present work describes the experimental mechanical characterisation of a natural flax fibre reinforced epoxy polymer composite. A commercial plain woven quasi-unidirectional flax fabric with spun-twisted yarns is employed in particular, as well as unidirectional composite panels manufactured with three techniques: hand-lay-up, vacuum bagging and resin infusion. The stiffness and strength behaviours are investigated under both monotonic and low-cycle fatigue loadings. The analysed material has, in particular, shown a typical bilinear behaviour under pure traction, with a knee yield point occurring at a rather low stress value, after which the material tensile stiffness is significantly reduced. In the present work, such a mechanism is investigated by a phenomenological approach, performing periodical loading/unloading cycles, and repeating tensile tests on previously “yielded” samples to assess the evolution of stiffness behaviour. Infrared thermography is also employed to measure the temperature of specimens during monotonic and cyclic loading. In the first case, the thermal signal is monitored to correlate departures from the thermoelastic behaviour with the onset of energy loss mechanisms. In the case of cyclic loading, the thermoelastic signal and the second harmonic component are both determined in order to investigate the extent of elastic behaviour of the material. View Full-Text
Keywords: flax fibre composite; tensile properties; crimped unidirectional textiles; damage; IR thermography; thermoelastic stress analysis flax fibre composite; tensile properties; crimped unidirectional textiles; damage; IR thermography; thermoelastic stress analysis
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Pitarresi, G.; Tumino, D.; Mancuso, A. Thermo-Mechanical Behaviour of Flax-Fibre Reinforced Epoxy Laminates for Industrial Applications. Materials 2015, 8, 7371-7388.

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