Abstract
The first known natural frequencies and mode shapes of the title problem are presented. The Ritz method with algebraic polynomial displacement functions is used. Convergence studies are made which demonstrate that accurate results are obtained using 144 displacement terms. The effect of the thickness ratio and fiber orientation angle upon the natural frequencies and mode shapes of three-layer, E-glass/epoxy and graphite/epoxy angle-ply plates is studied. The effect of the angle of twist is also studied.
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