Analytical and Experimental Investigations of Prestressed Laminated Composite Beams with Constrained Viscoelastic Damping Layer

Abstract

The damping characteristics of prestressed composite beams with con strained viscoelastic damping layers on one surface of the beam are investigated both ana lytically and experimentally. The analytical method involves derivation of finite element equations for the analysis of beam and plate structural elements with continuous or discon tinuous constrained viscoelastic damping layer with prestress. The experimental method is an impulse-frequency response technique which is used on preloaded laminated beams. Results for loss factors and natural frequencies of [90/90/0/90/90] and [90₃/0₃/90₃]_s T300/934 graphite-epoxy laminated beams with a 3M SJ-2052X constrained viscoelastic tape attached on one surface are presented. Numerical results based on the finite element prediction agree reasonably well with the experimental results under different tensile and compressive preloads.

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