Abstract
Vibration of a simply supported cross-ply laminated plate infinite in length is analyzed. Existence of plane strain conditions allow an exact solution of the field equations. Curves of variation of exact natural frequencies versus wavelength for several cases of a two-ply laminated plate are calculated. The first two mode shapes are plotted for various wavelengths and compared to classical plate theory. Flex ural vibration appears to be well approximated by classical theory up to moderate wavelengths. Extensional vibration is approximated mar ginally only for very long wavelengths.
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