Summary:
This study report the results of the investigation into the effects of surface adhesion
on fracture properties of glass fibre reinforced epoxy composites. A series of interlaminar fracture tests under mode I loading conditions have been undertaken on glass fibre reinforced epoxy composites using the Double Cantilever Beam specimen. The fibrematrix interface was treated using epoxy silane and methacryl silane coupling agents of different concentrations. The experimental compliance data reduction technique was used to calculate the fracture energy for each set of samples. The fracture surface of the specimens were analysed using the scanning electron microscope. Results obtained show that the interphase region significantly influences the overall material behaviour of composites and methacryl silane gives a better adhesion between the fibre-matrix interphase. Concentrations of 1.0wt% methcryl silane agents gives the lowest value of GIC(propagation) of 216 J/m2. Observations made from the micrographs of the scanning electron microscope showed that failure for the specimen treated with lower concentrations
of methacryl silane occurred at the fibre-matrix interface. Concentrations of 0.02wt%
methcryl silane agents gives the highest value of GIC(propagation) of 728 J/m2. This might be due to the increase in degree of fibre-matrix adhesion in a glass fibre/epoxy composite by reducing the fibre bridging phenomena as shown by the fracture surfaces micrograph. For lower concentrations of methacryl silane, the failure occurred both at the fibre-matrix and matrix-matrix interface.

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