lecture09a - 7 INTERFACIAL BONDING 7.1 Fundamental Concept...

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7. INTERFACIAL BONDING 7.1 Fundamental Concept The matrix and fiber/matrix interaction can have a significant effect on crack propagation in the composite. If the matrix shear strength and modulus and the fiber/matrix bond strength are too high, a crack may propagate through the fiber and matrix without turning. The composite will then behave as a brittle material and failed specimens will show clean fracture surface. If the bond strength is too low, the fibers will act as a fiber bundle and the composite will break. At an intermediate bond strength, a crack propagating transversely through resin or fiber may turn at the interface and travel along the fiber direction. This results in absorption of considerable energy; composites that fail by this mode are tough materials. Failed specimens will show considerable fiber pull-out and the fracture surface will be very rough with visible bare fibers. A compromise is needed between a system with high bond strength (for efficient load
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