Z. C. Xi
L. H. Yam
T. P. Leung
Dept. of Mech. and Marine Eng., Hong Kong Polytech. Univ., Hung Hom, Kowloon, Hong Kong
As composite materials are increasingly used in aerospace, marine, civil power generating, petrochemical, and chemical industries, the interaction of fluid and composite shells of revolution has been an active subject in the area of structural dynamics. In this paper, a semianalytical procedure was presented for predicting free vibration characteristics of liquid-filled composite shells of revolution. A new unaxisymmetric conical frustum element was derived based on the first-order shear deformation theory. The element considers both the displacement in the circumferential direction and the rotation around the meridian of the shell. The coupling between symmetric and antisymmetric modes is taken into account in the formulation. Reduced integration was employed to avoid ``shear locking.'' Numerical examples were given for free vibrations of liquid-filled laminated shells of revolution with various types of boundary conditions. Comparisons of the results predicted by the present paper with those available in the literature were made. The effects of the liquid depth, the ratio of mass density of the liquid to that of the shell, circumferential wave number, thickness to radius ratio, ply angle, and stacking sequence on natural frequency of wet shells were discussed. [Work supported by RC, HK Poly U.]
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