Abstract
The vibration Characteristics of laminated composite elliptical shell partially filled with liquid was investigated and compared with the same size isotropic elliptical shells. The obtained frequencies of the shells were plotted as a function of the circumferential wave numbers for each given axial wave number. For empty laminated composite shells, the frequency curve of the angle-ply shell and that of isotropic shell cross over at some circumferential wave numbers. However, it is found from the experimental results that when the elliptical shells are partially filled with liquid, this kind of crossover of the frequency curves disappears due to the mass effect of the liquid inside the shell.
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