Acoustic emission technique for health monitoring of composites

Qing-Qing Ni; Masaharu Iwamoto

doi:10.1117/12.429634

13 June 2001 Acoustic emission technique for health monitoring of composites

Qing-Qing Ni, Masaharu Iwamoto

Proceedings Volume 4317, Second International Conference on Experimental Mechanics; (2001) https://doi.org/10.1117/12.429634
Event: Second International Conference on Experimental Mechanics, 2000, Singapore, Singapore

Abstract

The fundamental characteristics of AE signals, such as the attenuation, frequency dependency of AE signals, were investigated and the fracture process of the single fiber composite (SFC) was examined. As a result, the frequencies of AE signals were almost unchanged, while the amplitudes attenuated greatly with the increment of the propagation length. This proved that the frequency analysis is an effective way in processing AE signals of composite materials. In the fracture process of the SFC the number of AE events was in a good agreement with the number of fiber breakages, and the sources of AE signals were the failure modes at fiber breakages. Using the prosed time-frequency method of wavelet transform to process AE signals, the micro failure modes at a fiber breakage and the micro fracture mechanism, such as the sequence of each failure mode and their interaction, were made clearer. These gave that the both processing methods of AE signals, FFT and WT, were powerful for identifying the micro failure modes and for elucidating the micro fracture mechanisms in composite materials.

Citation Download Citation

Qing-Qing Ni and Masaharu Iwamoto "Acoustic emission technique for health monitoring of composites", Proc. SPIE 4317, Second International Conference on Experimental Mechanics, (13 June 2001); https://doi.org/10.1117/12.429634

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