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26 April 1996 Piezoelectric implant: monitoring the water degradation in polymer-based composites
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Theoretical considerations show that the electrical impedance of a piezoelectric element depends on the physical and geometrical properties of the element and also on the viscoelastic characteristics of the different media surrounding it. According to a dynamic model, an original technique has been developed by inserting a piezoelectric ceramic in the composite structure when processed. The electric signal, after signal processing and numerical treatments, gives access to the viscoelastic properties of the external medium. This method is an excellent indicator to display the curing kinetics of the resin as well as the post-curing phase of the composite structure process. Moreover, a further application of this non destructive method is the monitoring of the hydrolytic degradation of the composite structure. The evolution of the electrical impedance of the piezoelectric sensor is presented here as a function of water exposition time for different polymer-based composites and compared to classical ultrasonic and rheological measurements.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
D. Zellouf, N. Saint-Pierre, Yves Jayet, and Jacques Tatibouet "Piezoelectric implant: monitoring the water degradation in polymer-based composites", Proc. SPIE 2779, 3rd International Conference on Intelligent Materials and 3rd European Conference on Smart Structures and Materials, (26 April 1996);

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