Abstract
The effects of in-plane force on the composite loss factor and natural frequency of a rectangular viscoelastic sandwich plate, which is composed of a core layer of viscoelastic material and thin elastic outer layers, are investigated. Assuming the vibratory energy dissipation to take place due to the shear deformation of the viscoelastic layer, the equation of motion and boundary conditions for a rectangular viscoelastic sandwich plate are derived from Hamilton's principle. The value of the composite loss factor of the sandwich plate increases as the in-plane compressive force increases, and decreases as the in-plane tensile force increases. Experiments have been carried out with a square sandwich plate with all edges built-in, subjected to no in-plane forces and to in-plane forces. Good agreement has been found between the experiments and calculations.
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