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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References
1.
Reifsnider, K.L., W.W. Stinchomb, E.G. Henneke and J.C. Duke. "Fatigue Damage-Strength Relationships in Composite Laminates ," Air Force Wright Aeronautical Laboratories, Technical Report No. AFWAL-TR-83-3084, Vol. I (1983).
2.
Awerbuch, Jonathan and Ghaffari, Shahrokh. "Monitoring Progression of Matrix Splitting During Fatigue Loading Through Acoustic Emission in Notched Graphite/Epoxy Composite," in the Proceedings of the Second International Symposium on Acoustic Emission From Reinforced Composites, The Society of the Plastics Industry, Inc., Montreal , Canada, pp. 51-58 (July 21-25, 1986) Also in this issue of JRPC, pp 245-264
3.
Awerbuch, Jonathan , Madhukar, Madhu, and Gorman, R. Michael. "Monitoring Damage Accumulation in Filament-Wound Graphite/Epoxy Laminate Coupons During Fatigue Loading Through Acoustic Emission," Journal of Reinforced Plastics and Composites , Vol. 3, No. 1, pp. 2-39 (1984).
4.
Awerbuch, Jonathan and Eckles, William F. "Detection of Failure Progression in Cross-Ply Graphite/Epoxy Through Acoustic Emission," in the Proceedings of the International Symposium on Composite Materials and Structures, Beijing, China, pp. 889-898 (June 10-13, 1986).
