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Composite materials are mostly submitted to dynamic loads, because of their excellent specific strength and stiffness, therefore the resonant technique is adequate for the determination of stiffness properties. Three plates of similar carbon-epoxy composites with distinct fibre orientations were studied with this technique. The effect of stacking sequence on the rigidity of laminated composites was investigated A significant influence of this material parameter on in-plane elastic properties was found, allowing optimization of stiffness for a particular application.

Influence of Ply Sequence on the Elastic Properties of Laminated Composites