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Abstract
A series of fatigue tests have been performed on CFRP angle-ply laminate specimens. Prior to fatigue tests, all specimens were given the impact of a free fall rod. The extension of surface cracks and of delaminations were observed using a replicated method and a scanning acoustic microscope (SAM), respectively. The crack growth process consisted of four stages, and crack growth rates gradually decreased over these stages. Although the area of delamination did not increase with the surface crack growth, once either of crack tip reached the edge of specimen, the delamination area began to extend with the internal matrix cracks. After surface cracks were generated on the upper surface given impact, fatigue damage propagated rapidly. Specimens were ruptured when the delamination area of the upper surface extended sufficiently.
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