Advances in Civil Engineering / 2010 / Article / Tab 5

Research Article

Integration of Networks of Sensors and Electronics for Structural Health Monitoring of Composite Materials

Table 5

Material with and without integrated inclusions: stress, amplitude, and frequency range of the first acoustic events, and their classification. The lower and upper limits of each range are the lower and upper values observed among all the experiments conducted. Only the events in a stress window of about 20 MPa have been considered. Results from laminates [16] are here reported for comparison.

Lay-upStress range of first AE events (MPa)First AE Events Amplitude range (dB)Peak Frequency of first AE events (kHz)Event type classification based on micrographic inspections

Blank Samples 320–40035–60100–180Matrix microcracking, fiber pull-out
Sample with device 89–10650–75150–300Matrix micro-cracking at the sensor interface, debonding events
Blank Samples 33–4340–50130–170Matrix micro-cracking, debonding,
Sample with device 10–1443–65150–350Matrix micro-cracking at the sensor interface, debonding events, friction

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