Thermo-Mechanical Characterisations of Flax Fibre and Thermoplastic Resin Composites during Manufacturing
Résumé
The flax fibre reinforced composites with advanced structure, which can be regarded as
recyclable parts, are potential and promising materials in the automobile industry. During their
manufacturing, the reinforcements or prepregs should be performed to the desired shape beforehand.
Mechanical behaviours accordingly play an important role during this process. However, this
preforming process is usually under high temperatures, thus, the mechanical behaviours could be
modified under this state. Especially for reinforcements produced by flax yarns, has barely been
studied. To fill this gap, in this paper the thermos-mechanical characterization of Flax/Polyamide12
(PA12) commingled yarn and prepreg woven fabric is analysed using tensile and in-plane shearing
tests under different temperatures and tensile speeds. The results conclusively show that strength can
be improved by increasing the temperature below the PA12 melting value on woven fabrics, which is
inverse tendency for single yarn. Moreover, increasing tensile speed could increase the strength of
the single yarn and fabric. This reveals that the PA12 fluidity has great influence on tensile behaviour.
The characterisation results would be employed as prescriptive recommendations in the process of
manufacturing flax fibre-reinforced composite parts.
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