Design of optimal configuration for generating A0 Lamb mode in a composite plate using piezoceramic transducers |
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Authors: | Grondel Sébastien Paget Christophe Delebarre Christophe Assaad Jamal Levin Klas |
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Institution: | IEMN, UMR CNRS 9929, Département OAE, Université de Valenciennes et du Hainaut Cambresis, Le Mont Houy, France. sebastien.grondel@univ-valenciennes.fr |
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Abstract: | This work concerned a technique for a health monitoring system based on the generation and sensing of Lamb waves in composite structures by thin surface-bonded piezoceramic transducers. The objective was to develop transducers that are adapted for the damage detection in orthotropic composites. The key problem with the investigated Lamb waves was to select a mode to be sensitive to the damage. A hybrid modeling technique was therefore used to conceive transducers that were adapted to achieve such a feature. This modeling technique enabled studying the influence of the transducer characteristics on the Lamb waves propagating in orthotropic plates. It was demonstrated that a Lamb mode could be generated dominantly to other modes by using a multi-element transducer. The effectiveness of this technique was successfully verified experimentally on composite plates. It was shown that the dominant Lamb mode, obtained by use of dual-element transducers, was an appropriate mode for successfully detecting a damage in composites. |
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