In this paper dynamics of shear deformable laminated plates with delaminations is studied. Laminated composite plates are used in a multitude of applications for their superior specific strength and specific stiffness in addition to their tailorable properties. It is also known that for laminated composites, shear deformation assumes importance in studying their characteristics. The formulation is based on Rayleigh Ritz method with beam characteristic functions used as admissible functions. The related integrals are evaluated using symbolic mathematics where integrable and numerical integrations are used otherwise. Delaminations are simulated by discarding the load carrying capacity of the lamina and recomputing the frequencies. Results are presented for various aspect ratios and side to thickness ratios. Analysis is also performed to compute the change in dynamic characteristics of edge cracks and thereby for detecting and monitoring damage in laminated composites. Finite element simulation is based on the principle of virtual displacement using Lagrangian elements including hygrothermal effects.
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