Effect of flax fibres individualisation on tensile failure of flax/epoxy unidirectional composite

Preparation and characterization of flax biocomposites made of seed mucilage reinforced by fibers

“…These values were similar to those of several biopolymers (PLA, PGA, and PHB) [35] and some thermoset resins such as unsaturated polyesters [36] and epoxy [32], including partially bio-based ones [37]. The mucilage samples were relatively stiff with an elastic deformation domain of $1%, and a subsequent strain to failure estimation of approximately 1.5%.…”

“…As reported for flax epoxy laminates [30], the first zone estimated the tensile modulus (E) over a 0.5-1.0% strain, whereas the strain of the second zone covered 5-6% until the failure. No sample exhibited complex behavior as reported for elementary fibers [31] or for some flax composites [e.g., [32], such behavior that was found particularly when the percentage of reinforcing fibers was high [33].…”

“…Indeed, Bos et al reported large E-values of up to 9 GPa for flax-polypropylene composites, depending on the length and orientation of the fibers, as well as on the processing of the composite [46]. Compared with unidirectional composites of similar flax fiber content, flax-mucilage composites had E-values that were two to three fold lower than most of the flax-epoxy composites (e.g., [23,32,33,47]), including ''biosourced'' epoxy composites [37]. These flax-epoxy composites had values of tensile strength that were close to those of Muc-R-I and Muc-R-Th.…”

Influence of Stem Morphology and Fibers Stiffness on the Loading Stability of Flax

“…Due to their low density (1.53 vs. 2.54 g/cm 3 for the glass fibres), the Marylin fibres average specific stiffness and stress at rupture were estimated to be 36.9 GPa cm 3 /g and 646 MPa cm 3 /g, respectively. These values are close to, and sometimes, for the Young's modulus, better than those of glass fibres (28.3 GPa cm 3 /g and 695 MPa cm 3 /g) (Coroller et al 2013). Moreover, although the flax fibre tensile properties are widely scattered, this phenomenon also occurred with the breaking properties of the glass fibres in opposition to their Young's modulus, which is more stable.…”

Optimization of the mechanical performance of UD flax/epoxy composites by selection of fibres along the stem

“…Then, micro-unidirectional composites, with a 6 Â 2 mm 2 section, were manufactured according to the process described by Coroller et al [9]. The Epolam 2020 resin was chosen because of its good compatibility with flax fibres [9].…”