title: Damage accumulation in cyclically-loaded glass-ceramic matrix composites monitored by acoustic emission.
abstract: 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.
authors.affiliation: Department of Mechanics of Materials and Constructions, Free University of Brussels, Pleinlaan 2, 1050 Brussels, Belgium ; Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece.
authors.forename: D G
authors.initials: DG
authors.lastname: Aggelis
authors.affiliation: Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece.
authors.forename: K G
authors.initials: KG
authors.lastname: Dassios
authors.affiliation: Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece.
authors.forename: E Z
authors.initials: EZ
authors.lastname: Kordatos
authors.affiliation: Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece.
authors.forename: T E
authors.initials: TE
authors.lastname: Matikas
mesh_terms: D000162:Acoustics; D002516:Ceramics; D005898:Glass