REAL-TIME MONITORING OF THE INFUSION PROCESS OF A POLYMER-MATRIX COMPOSITE WITH AN EMBEDDED PIEZOELECTRIC TRANSDUCER
Résumé
This article investigates the Liquid Resin Infusion (LRI) manufacturing of glass fiber/polyester composite plates embedding a thin piezoelectric (PZT) disk. The real-time in-situ Process Monitoring (PM) of this technique is performed using the electrical capacitance signature of the embedded PZT transducer. To help with the understanding of capacitance variations, an internal/external multi-instrumentation (Infrared Thermography, thermocouples, Acoustic Emission, Z-displacement sensing, pressure sensing) was set on the infusion systems, so that it was possible to make couplings between the various obtained measurements and the PZT capacitance curves. Rheological tests were also performed on resin samples to find correlations between the matrix chemo-physical transitions during curing and PZT capacitance inflections during its final decrease. It was shown that the PZT capacitance is sensitive to several key moments of the infusion process, such as the end of preform impregnation, the isolation of the system at the end of resin injection, and the different resin curing stages such as gelation and vitrification. It is therefore a cheap and quite powerful in-situ Non-Destructive Testing device for the PM of the LRI manufacturing.
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