21st Congress of International Council of the Aeronautical Sciences, Melbourne, Australia, 13-18 September, 1998
Paper ICAS-98-R.4.11

FREE FLEXURAL VIBRATIONS OF COMPOSITE PLATES OR PANELS STIFFENED BY A CENTRAL OR NON-CENTRAL PLATE STRIP - SOME COMPARISONS

Yuceoglu U., Ozerciyes V.
Middle East Technical University, Turkey

Keywords: free flexural, vibrations, composite plates or panels, stiffened

The free bending vibrations of orthotropic base plates or panels with a bonded central and non-central stiffening plate strip are analyzed and are compared with each other. In both cases, the base plate or panel and the stiffening strips are made of dissimilar, orthotropic Mindlin plates and they are joined together by a very thin, yet flexible adhesive layer. The governing system of partial differential equations are first reduced to a special first order form and then, integrated by the "Modified Version of the Transfer Matrix Method". The effects of the bonded central and non-central stiffening strip on the mode shapes and natural frequencies of the two composite plate system are investigated. It is shown that the position of the stiffening plate strip greatly influence the mode shapes and natural frequencies of the composite plate or panel system.

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