Abstract
ABSTRACTComposite materials are widely used in aeronautical, marine and automotiveindustries, because of their excellent mechanical properties, low density and ease ofmanufacture .However, composite laminates are susceptible to delaminations, whichmay not be visible externally, but can substantially affect the performance of thestructure. Vibration testing, in particular delamination detection, in the compositestructures is an active research area. D'Alembert principle is used to determine thetheoretical natural frequency of laminated orthotropic composite plate. The presentfree vibration experimental study of simply supported square laminated plates isbased on the comparison between natural frequencies of healthy and delaminatedcomposite plates. The test square plates made of hand lay up 8 layers E-glasswoven fibre and epoxy resin are used here. The present paper discusses theobservations made on the measured natural frequencies of vibration testing fromboth the healthy and the delaminated square simply supported plates. The possibilityof the delamination detection by vibration testing is also introduced. The effects ofdelamination area on the natural frequencies of the plate are presented. Thedelamination in composite laminates has considerable effect on the naturalfrequencies of the plate.
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