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Acoustic emissions (AE) generated by a structure under stressed condition provides a passive means to characterise defect initiation and defect growth in the structure.Composite structures are best evaluated by such new techniques. The amount of heterogeneity and presence of various failure mechanisms increase the complexity of Acoustic Emission evaluation. AE data has been generated by conducting tensile tests on carbon epoxy Uni-Directional Longitudinal (UDL) specimens. Failure mechanisms like matrix cracking and fiber breakage have been characterized by comparing and correlating significant AE parameters acquired from various specimens by employing Visual Pattern Recognition Technique.The amplitude distribution, cumulative amplitude distribution and cumulative signal strength parameters have been studied in correlation with applied load. The cumulative amplitude plot is bi-linear indicating the presence of two distinct failure mechanisms. The change of slope (break in linearity) occurs at 85 dB which is a vivid indication of fibre breakage initiation. There are a large number of Acoustic Emission Hits associated with energies less than 100 units which represent the matrix-cracking spectrum. The cumulative signal strength plot indicates the onset of damage of the specimen at about 70%-80% of the load. The onset of Historic Index (Rate of variation of Cumulative Signal Strength w.r.t Load) exceeding 6 also indicates damage initiation in the specimen.

Failure Mode Identification by Pattern Recognition with Acoustic Emission Technique - A Case Study on UDL carbon-Epoxy Specimens