Structural Integrity of Laminated Composite with Embedded Piezoelectric Sensors
Résumé
Recent progress in sensor technologies, signal processing and electronics made it possible to fulfil the need for the development of in-service structural health monitoring (SHM) systems. An experimental study of local damage materials using acoustic emission (AE) has been conducted to characterize the mechanic behavior of E-glass/epoxy unidirectional composites instrumented by piezoelectric implant. A series of specimens of composite laminates with and without embedded piezoelectric were tested in static loading while constantly monitoring the response by AE technique. The acoustic signals were analyzed by the classification multi-parameters method available on NOESIS (k-means) in order to identify the different damage and to follow the evolution of these various mechanisms for both types of materials (simple and instrumented). The results show that integration of the sensors presents advantages of the detection of the acoustic events and also show the presence of three types of damage during tests. Comparing embedded sensor to sensor mounted on the surface, the embedded sensor showed a much higher sensitivity.