Rotatory vibration of an aeolotropic non-homogeneous annular disk of variable thickness

The object of this paper is to determine the mean stresses, displacements and especially the frequencies due to rotatory vibrations of an aeolotro-pic non-homogeneous annular disk of variable thickness. The elastic constants, density of material and thickness of the disk are considered to be a function of position. Interesting particular cases are considered and compared numerically and graphically with the established results.