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Studies of composite materials in recent years have focused on the use of natural fibres as an alternative to synthetic fibres. The attractive mechanical properties, sustainability, low cost and low weight are potential factors that have leveraged research in this area, due to the variety of applications in the engineering sector. A full factorial design (2161) was performed to identify the effect of silica inclusions and the stacking sequence of glass fibres and short sisal fibres. The response-variables, such as apparent density, tensile and flexural strength and modulus of elasticity, were assessed in this work. In general, the incorporation of silica particles improved the performance of composites containing larger amounts of sisal fibres. Hybrid composites with higher number of glass fibre layers achieved higher values of tensile and flexural strength (348 MPa and 663.28 MPa) and tensile and flexural modulus (22 GPa and 2.50GPa) and higher apparent density value (2.02 g/cm3).

Hybrid composites based on silica, glass and short sisal fibres