Investigation of the effect of geodesic and semi-geodesic winding on the vibration characteristics of variable stiffness filament wound shells of revolution

Date

2012-12-01

Author

Kayran, Altan
Yavuzbalkan, Erdem
Ibrahimoǧlu, Serkan

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Vibration characteristics of variable stiffness filament wound composite shells of revolution are investigated utilizing a numerical integration based solution method that is developed. Filaments are assumed to be placed along the geodesic and semi-geodesic fiber paths on the surface of the shell of revolution resulting in the variation of the stiffness coefficients and the thickness of the shell wall along the axis of the composite shell of revolution with general meridional curvature. For geodesic and semi-geodesic winding, relations giving the meridional variation of the winding angle and thickness are derived for truncated conical and spherical shells of revolution which are studied as the sample shell geometries. The effect of constant preset friction, applied during the winding process, on the stiffness and vibration characteristics of filament wound composite shells of revolution is studied in depth. In the most general case, multi-segment numerical integration technique is extended to the solution of the free vibration problem of composite shells of revolution which are wound along the semi-geodesic fiber paths counting on the preset friction used during the winding process. The effect of initial winding angle and the starting edge of the winding operation on the variation of the thickness, stiffness coefficients and free vibration characteristics of filament wound shells of revolution are investigated. Case studies are also performed on the comparison of the frequencies calculated by incorporating the actual variation of the winding angle and thickness, and the frequencies calculated based on constant winding angle and thickness which are taken as average and mid meridian values. © 2012 by the American Institute of Aeronautics and Astronautics, Inc.

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https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84881388947&origin=inward
https://hdl.handle.net/11511/106608

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Department of Aerospace Engineering, Conference / Seminar