Stressed state of axially loaded turbine journal lips

Abstract

1. In loading a gently sloping conical shell of average thickness (h/R=0.0.08; 0.11) with an axial force, its stress-strain state is characterized mainly by bending in the meridional and circumferential directions. This state can be taken as two-dimensional. 2. Thin cylindrical ribs on the shell surfaces cause meridional stress concentration and practically do not affect the circumferential stress distribution. 3. The strses concentration around a hole in a gently sloping conical shell of average linearly variable thickness should be compared qualitatively with the stress concentration around a hole in a bending plate. 4. The stress concentration factor for the stresses around a hole, the axes of which is parallel to the shell axis (in case of conical shells loaded with an axial force), is less than that for stresses around a hole perpendicular to the shell surface. 5. The presence of ribs and a large number of holes significantly changes the stressed state of a shell. Therefore, based on data on shells, the stressed state of such a complex model, like that of a turbine journal-lip, can be estimated only approximately.