Abstract
The fracture mechanisms of fatigue-loaded fiber-reinforced polyethylene terephthalate (FRPET) composite with a notch are investigated by the acoustic emission (AE) technique and the residual strengths are estimated. It is found by AE frequency analysis that fiber breaking occurs at low stress amplitude but debonding between the fiber and the resin occurs as the stress amplitude increases. The residual strength can be estimated from the relationship between the ratio P/P(N) of loads producing the change in the damage mechanism of the fatigue-loaded specimen and the non-fatigue-loaded specimen and the ratio N/Nf of the number of cycles N to the number of cycles to failure Nf.
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