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Valdés, S. H. Díaz
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article
Health monitoring of composites using Lamb waves generated by piezoelectric devices
Abstract
The present paper examines the application of low frequency Lamb waves for the detection of delaminations in composite laminates. Surface mounted piezoelectric devices were excited with a tone burst of few cycles generating a propagating stress wave along the structure. Experiments were carried out on composite beam specimens, for which wave propagation distances over 2 m were achieved and artificially induced delaminations as small as 1 cm2 were successfully identified. The feasibility of employing piezoelectric devices for the development of smart structures, for which a small and lightweight transducer system design is required, has been demonstrated. Finite element results of wave propagation in wide plates are also presented. PRC/1681 © 2000 IoM Communications Ltd.