Health monitoring of carbon/carbon, woven reinforced composites: Damage assessment by using advanced signal processing techniques. Part II: Acousto–ultrasonics monitoring of damage development

In the second part of this work, the acousto–ultrasonics waveforms acquired during the tests described in part I are processed using wavelet-based techniques in order to extract parameters capable of monitoring the damage accumulation in the C/C test coupons. A 10 level decomposition using the discr...

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Bibliographic Details
Published in:Composites science and technology 2009-02, Vol.69 (2), p.273-283
Main Authors: Loutas, T.H., Kostopoulos, V.
Format: Article
Language:English
Subjects:
A. Ceramic-matrix composites (CMCs)
Applied sciences
Building materials. Ceramics. Glasses
C. Wavelet transform
Ceramic industries
Chemical industry and chemicals
D. Non-destructive testing
Exact sciences and technology
Miscellaneous
Technical ceramics
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Description
Summary:In the second part of this work, the acousto–ultrasonics waveforms acquired during the tests described in part I are processed using wavelet-based techniques in order to extract parameters capable of monitoring the damage accumulation in the C/C test coupons. A 10 level decomposition using the discrete wavelet transform is applied upon each one of the acquired acousto–ultrasonics waveforms. The continuous wavelet transform was also used and the wavelet grey moment was calculated for each waveform. Some of the parameters extracted from the wavelet-based analysis show an interesting monotonic variation and thus can be used as potential candidates for monitoring the damage development in the tested materials.
ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2008.09.042