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Sisal Fibre Bundle Composites—A Review of Properties in Relation to Microstructure

M. P. ANSELL

Abstract



The mechanical properties of natural fibre composites comprised of sisal fibre bundles in thermosetting or thermoplastic polymer matrices are described. Following a brief review of the physical properties and eco-profile of sisal fibres in the context of other plant and synthetic fibers, the statistical variability in fibre bundle strength and interfacial shear strength are examined. Techniques for manufacturing well aligned, low matrix porosity fibre composites are described and the scope for property optimization by fibre surface treatments and densification is explored. The strength of in-line, co-cured joints is reported and an inter-laminated fibre lay-up offers high joint integrity. Fatigue properties and failure modes of sisal-epoxy composites are presented in the form of hysteresis loops and constant life diagrams in reversed loading and tension-tension modes. A method for the manufacture of thermoplastic matrix composites, based on sisal fibers in a poly (lactic acid) (PLA) matrix, is explained and the morphology of crystal growth on the surface of the fibre bundles is described. It is concluded that sisal plant fibre composites have a role to play in engineering with limitations relating to strength, elastic modulus and environmental stability.

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