Damping of Flexural Vibration of Viscoelastic Sandwich Beam Subjected to Axial Force

概要

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The composite damping characteristics of a viscoelastic sandwich beam which is composed of a core layer of viscoelastic material and thin elastic outer layers, subjected to an axial force are investigated. As in the work of Kerwin and DiTaranto the vibratory energy dissipation is assumed to take place due to the shear deformation of the viscoelastic layer, whose shear modulus is represented as a complex one. The value of composite loss factor of the sandwich beam increases ad the axial compressive force increases, and decreases inversly as the axial tensile force increases. A large effect of axial force on the composite loss factor manifests itself with a lowering of the frequency of the sandwich beam. Experiments have been carried out with fixed ends sandwich beams subjected to axial forces .Good agreement has been found between the experimental and calculated composite loss factors to the axial forces within 30 per cent of the buckling load of the sandwich beam.
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