Abstract
The fracture toughness of an epoxy resin reinforced with discontinuous glass fibres of low fibre aspect ratios was measured by double cantilever cleavage tests and notched bend tests. The fibre-matrix interfacial adhesion was varied by applying different surface treatments to the fibres. It was observed that the interfacial bond strength determines whether the crack initiates by debonding at the fibre-matrix interface or by fibre failure and also the relative values of the energies absorbed during these processes. The interfacial bond strength also controls the energy absorbed due to fibre pull-out. When all these energies are accounted for it is shown thata weak interfacial bond may produce a composite with a fracture toughness higher than that which can be obtained by strong interfacial bonds.
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