Damage Accumulation in Cyclically-Loaded Glass-Ceramic Matrix Composites Monitored by Acoustic Emission

Barium osumilite (BMAS) ceramic matrix composites reinforced with SiC-Tyranno fibers are tested in a cyclic loading protocol. Broadband acoustic emission (AE) sensors are used for monitoring the occurrence of different possible damage mechanisms. Improved use of AE indices is proposed by excluding l...

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Detaylı Bibliyografya
Asıl Yazarlar: D. G. Aggelis, K. G. Dassios, E. Z. Kordatos, T. E. Matikas
Materyal Türü: Makale
Dil:English
Baskı/Yayın Bilgisi: Hindawi Limited 2013-01-01
Seri Bilgileri:The Scientific World Journal
Online Erişim:http://dx.doi.org/10.1155/2013/869467
Diğer Bilgiler
Özet:Barium osumilite (BMAS) ceramic matrix composites reinforced with SiC-Tyranno fibers are tested in a cyclic loading protocol. Broadband acoustic emission (AE) sensors are used for monitoring the occurrence of different possible damage mechanisms. Improved use of AE indices is proposed by excluding low-severity signals based on waveform parameters, rather than only threshold criteria. The application of such improvements enhances the accuracy of the indices as accumulated damage descriptors. RA-value, duration, and signal energy follow the extension cycles indicating moments of maximum or minimum strain, while the frequency content of the AE signals proves very sensitive to the pull-out mechanism.
ISSN:1537-744X