Abstract
A method for FEM eigenvalue problems of symmetrically laminated composite shells is developed. A 15 d. o. f. flat triangular shell element is formulated considering the anisotropic behavior of composite materials with the assumption that the transverse normal strain is linear in symmetrical lamination. The present method enables us to analyze large scale problems by only a desktop microcomputer, using a subspace iteration algorithm and a skyline solver scheme. In order to estimate the accuracy of the program, eigenvalue problems of Donnel-type circular cylinders are calculated and compared with exact solutions.
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