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Acoustic emission for characterization of failure mechanism in textile reinforced mortar laminates
Book Contribution - Book Chapter Conference Contribution
This work presents the acoustic emission (AE) behaviour of textile
reinforced cementitious composite laminates (TRC) under tensile and flexural
loading. The aim is to connect specific AE parameters and indices to the different
fracture mechanisms that are successively activated within the failure process of the
complex composite material. These mechanisms include multiple matrix cracking at
low load and fibre pull-out after the maximum load is reached. Interlaminar shear is
also activated during bending depending on the thickness of the laminates.
Preliminary analysis indicates that frequency and AE waveform shape parameters
are shifting, following the shift of fracturing mechanisms. Since the heterogeneous
fibrous nature and the plate specimen geometry are bound to result in wave
dispersion, multiple sensors are used to investigate the effect of wave distortion due
to propagation. It is concluded that while AE indices can adequately characterize the
fracture process in real time, the sensor separation distance should be accounted for,
in order to produce reliable characterization of the damage mechanism regardless of
the sensors location.
reinforced cementitious composite laminates (TRC) under tensile and flexural
loading. The aim is to connect specific AE parameters and indices to the different
fracture mechanisms that are successively activated within the failure process of the
complex composite material. These mechanisms include multiple matrix cracking at
low load and fibre pull-out after the maximum load is reached. Interlaminar shear is
also activated during bending depending on the thickness of the laminates.
Preliminary analysis indicates that frequency and AE waveform shape parameters
are shifting, following the shift of fracturing mechanisms. Since the heterogeneous
fibrous nature and the plate specimen geometry are bound to result in wave
dispersion, multiple sensors are used to investigate the effect of wave distortion due
to propagation. It is concluded that while AE indices can adequately characterize the
fracture process in real time, the sensor separation distance should be accounted for,
in order to produce reliable characterization of the damage mechanism regardless of
the sensors location.
Book: Proceedings of the 31st Conference of the European Working Group on Acoustic Emission
Number of pages: 7
Publication year:2014
Keywords:acoustic emission, Textile reinforced mortar, laminate, failure