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Supersonic Flutter Analysis of Stiffened Laminated Plates Subject to Thermal Load

✍ Scribed by I. Lee; D.-M. Lee; I.-K. Oh

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
273 KB
Volume
224
Category
Article
ISSN
0022-460X

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✦ Synopsis

Flutter analysis of stiened laminated plates has been performed. The purpose of this study is to analyze the ¯utter characteristics of stiened plates subject to thermal load. The ®rst order shear deformable plate and Timoshenko beam theories are used for the ®nite element modelling of a skin panel and stieners respectively. The von Karman non-linear strain±displacement relation is used to account for large de¯ections. First order piston theory is used for modelling aerodynamic loads. The Newton±Raphson iteration method and complex eigenvalue solver with the LUM/NTF approximation method are used to obtain the postbuckled de¯ection and ¯utter information respectively. The Guyan reduction method and mode tracing procedure are employed for an ecient analysis. The eects of various parameters, such as the stiening scheme, lamination angle, boundary conditions, and temperature gradient on ¯utter characteristics are investigated through some numerical examples. From these examples, it can be shown that the selection of a proper stiening scheme results in great improvements of ¯utter characteristics of laminated panels without introducing considerable weight penalty.

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