Damping of laminated plates: boundary condition and lamination sequence effects

Abstract eng:
The present study is aimed at determination of an optimal fiber orientation for the maximum modal structural damping of laminates based on in-plane viscoelastic properties obtained for a highly directional out-of-autoclave carbon/epoxy system using the dynamic mechanical analysis. The validation of material loss factors is also provided by conducting experimental modal analysis on unidirectional beam components with preferential ply angles subjected to an impulse excitation. Three different lamination sequences under the combination of clamped and free boundary conditions are taken into account. Under each boundary condition, the effect of fiber orientation on variation of modal loss factor and frequency associated with the first mode of flexural vibration is also studied.

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