APPROXIMATE MODELLING OF FLUID INFLUENCE ON AXISYMMETRIC WAVE DISPERSION IN AN INFINITE HOLLOW CYLINDER

The dispersion of the axisymmetric stress waves propagated in the infinite hollow cylinder filled with water is studied. Modification of a semianalytical FE approach for “dry” cylinders for this case and other independent FE approaches are described. The usage of the approaches in question is demonstrated for thick and thin cylinders in cases of isotropic and composite (monoclinic) materials. Influence of water upon the dispersion properties of waves is demonstrated by dispersion curves and shapes of waves. Some dispersion curves were influenced by fluid only weakly, but some dispersion curves were influenced very strongly even for very thick cylinders.