Influence of Asymmetric Imperfections on the Vibrations of Axially Compressed Cylindrical Shells.

摘要

The influence of two types of asymmetric initial geometrical imperfections on the vibrations and buckling of axially loaded isotropic cylindrical shells is studied. The analysis is based on a solution of the Karman-Donnell nonlinear shell equations by the Galerkin method. The results indicate that the influence of the initial geometrical imperfections depends strongly on the mode of the initial imperfection and its relation to the mode of vibration. The imperfections may lower or raise the frequency. The buckling loads also depend strongly on the relation between the corresponding modes. In general, a reduction in buckling load is predicted, but in some cases the solution predicts an increase in buckling loads due to imperfections and in certain cases even large bending deformation without buckling.