The three-dimensional linear theory of elasticity is used to de- lineate the effect of the thickness, stiffness, and mass density of piezoelectric (PZT) layers on the first five natural frequencies of a simply supported graphite/epoxy laminated plate with PZT layers embedded in it. Platelike smart structures are usually made of PZT patches ei- Their embedded in or bonded to the bounding surfaces of a plate. In This Note, an attempt is made to ascertain changes in the natural Frequencies of the underlying plate due to the PZT patches.
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