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Fracture Behavior of Continuous Alumina Fiber Reinforced Epoxy

General Motors Corporation, Gear Center, 37350 Ecorse Road, Romulus, MI 48174

This work investigates fracture behavior of a continuous alumina fiber (FP) reinforced epoxy under compression at two different temperatures. Effects of fiber orientation, stacking sequence, and temperature on failure mechanisms of the composite material are analyzed through a scanning electron microscope (SEM). Fiber orientation is found to affect the failure mechanisms of the FP/epoxy. While the failure of the 00 laminae is mainly caused by fiber breakage, that of the 90° laminae by sheared epoxy matrix. The [0₂/90₂]_s laminates not only have the combined failure modes of the 00 and 900 laminae but also show fiber micro-buckling in the 0° plies and ply delamination at the interfaces of the 0° and 900 plies. Failure mechanisms are found to be different between the symmetric and antisymmetric crossply laminates. In addition, the composites fractured at 77 K display more fiber-matrix debonding, smoother fractured surfaces of fiber and matrix, and cleaner ply delamination at the interfaces of the 00 and 900 plies than the composites fractured at 295 K.

Key Words: composites, alumina fiber • epoxy matrix • fracture behavior • compression

Journal of Composite Materials, Vol. 28, No. 13, 1227-1236 (1994)
DOI: 10.1177/002199839402801303


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