Abstract
Finite difference equations of motion of the sixth order and the associated boundary conditions for principal planes are formulated for a f.c.c. lattice of mass particles. The equations are solved for face-shear and thickness-twist waves in a plate with free faces. Computations of mode-shapes and the frequency spectrum are presented for copper and the results are compared with a previous solution for a simple cubic material and with the solution of the classical equations of elasticity.
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