Monitoring Acoustic Emission in Cross-Ply Graphite/Epoxy Laminates During Fatigue Loading

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Abstract
Destructive and nondestructive examinations of composite laminates subjected to exter nal loading have indicated that these materials contain a large number of cracks, both on the micro- and macro-scales. Consequently, a significant amount of emission can be generated during fatigue loading not only by damage accumulation (progression) but also by the continuous friction that results from the fracture surfaces grating against each other. Consequently, in order to monitor fatigue damage progression in composite laminates by acoustic emission (AE), the emission caused by the fretting should be distinguished from that generated by actual damage growth.

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