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Finite Element Modeling of Segmented Active Constrained Damping Layers including Bonding Layer Effect

This paper presents a new research and design finite element tool to analyze segmented active constrained layer damping treatments applied in bending. This numerical tool is based on a new five-layer beam finite element that accounts for bonding layer strain energy. Preliminary studies have confirmed that strains in the bonding layers can have a significant effect on damping ratios at the fundamental modal frequencies. This effect is particularly strong when relatively thin compliant piezo materials are used for constraining layers. The frequency-dependent stiffness and damping properties in viscoelastic materials are modeled using anelastic displacement fields (ADF). The effectiveness of the finite element model is validated experimentally for both active and passive constraining layers.