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The failure mode in graphite filament reinforced epoxy composites loaded in shear is dependent on the strength of the interfacial bond. Failure of composites made from untreated filaments occurs progressively by interfacial debonding and crack propagation through the resin. Shear strength of these composites is low and is inversely proportional to the filament volume fraction. Failure of composites made from treated filaments may occur at the interface, in the matrix, or in the filaments, and may be in shear or tension or a combination of both. Shear strength of these composites is high, but the factors leading to high shear strength also lead to brittle fracture of the material. Thus, the consequences of increasing shear strength on other properties such as impact strength must be studied carefully in light of the intended application.
fiber composites, fractures (materials), carbon fibers, graphite composites, epoxy laminates, mechanical properties, evaluation, tests
Novak, R. C.
senior engineerresearch scientist, Aeronutronic Division of Philco-FordUnited Aircraft Research Laboratories, Newport BeachEast Hartford, Calif.Conn.