Abstract
Te authors have investigated the anisotropic properties of plain weft knitted glass fibre fabric reinforced epoxy composites oriented at different off-axial angles and subjected to compressive and shear loads. The compression test results in the off-axial angles of 0°, 30°, 45°, 60° and 90° indicated that the ultimate compressive strength and compressive modulus were greatest at 0° but decreased at other off-axial angles. The compressive strength was higher than the tensile strength for the knitted fabric composite at any offaxial angle. On the other hand, the shear test results for the same off-axial angles showed that the ultimate shear strength and shear modulus were greatest at the off-axial angle of 60°. A simple analytical model was applied to calculate the compressive strength at any off-axial angle, by using three critical strength parameters, i.e. the compressive strengths of 0° and 90° and the shear strength of 0°. The theoretical strength data agree favourably with our experiments.
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