Abstract: | For calculating the natural complex frequencies of torsional vibrations of rectangular orthotropic composite cantilever rods,
a theory taking into account the normal stresses and inertial forces acting in the axial direction is employed. The results
obtained are compared with those found by using the classical theory of torsional vibrations of rods, the theory of vibrations
of thin orthotropic plates, and the FEM. It is found that the difference between the natural frequencies given by the classical
and refined theories depends on relations between geometrical sizes of a rod and between its axial elastic modulus and shear
moduli, and on the number of the mode of torsional vibrations. |