Abstract
Despite the wide development of biocomposites, their compressive behaviour is still not well understood. In this paper, the longitudinal compressive and tensile behaviour of unidirectional natural fibres is studied through a parametric analysis taking into account the nature of the fibre (flax or jute), the matrix (thermoplastic and thermoset: PP, PP/MAPP, PA11, epoxy or acrylic), the fibre volume fraction and the fibre/matrix bond strength. In parallel with this approach, the quasi-static tensile behaviour is also investigated to allow comparisons. At low strains, the compressive and tensile moduli are closely similar. On the other hand, the compressive strength is systematically lower than the tensile strength whatever the fibre and matrix used. With a PP matrix, use of a coupling agent (MA) to improve the Interfacial Shear Strength (IFSS) leads to an increase of strength, which highlights the importance of this parameter. The compressive strength increases with the fibre volume fraction, but the maximum value remains lower than 140 MPa. Back calculation allows us to estimate the compressive strength of the flax fibres as 240 MPa, which appears as a current limit for the dimensioning of biocomposite structures.
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