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.
Highlights
The importance of monitoring the structural safety of structures is imperative
Barium osumilite (BMAS) ceramic matrix composites reinforced with SiC-Tyranno fibers are tested in a cyclic loading protocol
When load approaches the maximum value of each cycle, acoustic emission (AE) is recorded in large numbers, as can be seen by the slope of the curve
Summary
The importance of monitoring the structural safety of structures is imperative. Early assessment of material conditions before large-scale fracture emerges helps to prevent destructive failure and to manage the structures safely and economically. The amount of the recorded acoustic energy depends on the movement at the crack tip during crack propagation, being, indicative of the moment of crack initiation, the severity of active cracking, and the extent of damage [13,14,15] Analysis of AE indices enlightens the characterization of the cracking mode The importance of this information lies in the fact that usually in structural materials shear phenomena like debonding or delaminations follow tensile ones like matrix. Results show that AE indices under proper study lead to characterization of the current state of structural condition, being sensitive to the load and the active damage mechanisms
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