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Evaluation of linear and non-linear structural internal damping : experimental and numerical investigations

Salem , Amgad and Gourinat, Yves Evaluation of linear and non-linear structural internal damping : experimental and numerical investigations. (2002) In: 10th international conference on applied mechanics and mechanical engineering, 14-16 May 2002, Cairo, Egypt .

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Abstract

This paper deals with an evaluation of intrinsic vibration damping properties of structural materials. In addition, the effect of visco-elastic material at interfaces for reduction of unwanted resonance has been considered. Tests were performed under vacuum in order to isolate the internal damping from the atmospheric action on specimen. The tests are realized for aluminum and carbon epoxy cantilever plates dynamically tested in bending, in free vibration and imposed deflection. The resonance frequency of flexure mode is determined analytically by Rayleigh Ritz method and numerically by finite element program. The structural damping characteristics are integrated in the program to obtain the response of these structures to dynamic loading. The contribution is focused on reproducing the structural materials behavior near the resonance frequencies involving intrinsic damping. The confrontation of the experimental and the numerical results provided good agreement, defining, for each material, a linear classical viscous part of damping, and also non-linear terms due to non-viscous dissipation and to the influence of interactions between phases in composites.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
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Institution: Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE
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Deposited By: Yves GOURINAT

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