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Dolbachian, Loan
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document
STRUCTURAL HEALTH MONITORING (SHM) OF SMART SANDWICH COMPOSITES DURING THREE-POINT BENDING TESTS
Abstract
This article presents the Structural Health Monitoring (SHM) study conducted on the smart sandwich composites under three-point bending tests. Piezoelectric transducers (PZT and P(VDF-TrFE)/CP) were integrated inside the Polymer-Matrix Composite (PMC) skins to make them "smart". Several Non-Destructive Testing (NDT) techniques have been used: the classical ones (external Acoustic Emission (AE), thermocouples, strain gauges…) and new ones using the embedded transducers (internal Acoustic Emission (AE), Electrical Capacitance and Ultrasonic testing (US)) were combined simultaneously. The monotonic and load/unload three-point bending tests introduced progressive damages in sandwich composite specimens and the combined NDT techniques made it possible to monitor, in real-time and in situ, the different damage signatures before, during and after the mechanical tests. The obtained results of the non-destructive approach show a multiphysics (thermal/mechanical/acoustic and ultrasonic) coupling in the detection and monitoring of the different damage mechanisms of sandwich composite materials.