Quantitative Experimental Measurements of Matrix Cracking and Delamination using Acoustic Emission

JJ Scholey, PD Wilcox, MR Wisnom (Bristol University), MI Friswell (Swansea University)

Composites Part A: Applied Science and Manufacturing, Vol. 41, No. 5, May 2010, pp. 612-623

Abstract

The majority of reported acoustic emission (AE) source characterization studies are conducted on narrow specimens where the results are influenced by reflected wave energy from the specimen edges. The work in this paper is concerned with the design and application of AE testing on large fibre reinforced composite specimens to avoid the effects of edge reflections. AE waveforms from matrix cracking and delamination are examined. Measured waveforms, reported on an absolute amplitude scale, are used to study the angular amplitude patterns from the two damage mechanisms. Matrix cracking events are shown to be dominated by the S0 mode and produce a repeatable angular amplitude pattern. Delamination events are dominated by the A0 mode and show a less consistent angular amplitude pattern. The results indicate fundamental differences between the AE from the two types of damage mechanism and the implications for the design of AE monitoring systems are discussed.

Paper Availability

This material has been published in the Composites Part A: Applied Science and Manufacturing, Vol. 41, No. 5, May 2010, pp. 612-623, the only definitive repository of the content that has been certified and accepted after peer review. Copyright and all rights therein are retained by the Elsevier.


Link to paper using doi: 10.1016/j.compositesa.2010.01.008

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