Abstract
This paper studies the evaluation of damped free vibration characteristics of FRP laminated composite plates. For this purpose. the strain energy and the kinetic energy are formulated for the rectangular plate based on Discrete-Layer Theory (DLT). Higher-order Shear Deformation Theory (HSDT) and Classical Lamination Theory (CLT). respectively. The frequency equations are derived for the plate freely-supported at all edges by using the Ritz's procedure. In the numerical examples, natural frequencies and specific damping capacities are calculated numerically for the plates by assuming complex elastic modulus. Natural frequencies and modal damping ratios are also obtained experimentally by experimental modal analysis. Finally the applicability of each analytical model for damped vibration analysis is studied by comparing with numerical and experimental results.
Published Version
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