Abstract
Many different plate structures can be classified as specially orthotropic, such as cross-ply composites, unidirectional composites and quarter-cut wood boards. A simple method of determining the four elastic constants of a completely free, specially orthotropic plate has been developed. An improved Rayleigh expression, utilizing beam functions, is used to represent the deflection shape of the plate. A dimensionless objective function is formed from the frequency equation. The material properties are determined by minimizing the objective function with respect to modal analysis and geometry data. The technique has been successfully used on aluminum, composite and wooden plates. The ease of the method lends itself to use in NDE of composite plates and qualification of wood used in the construction of musical instruments.
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