Stress concentration around the shroud hole of steam turbine blades

Results of study of the stress-strain state around shroud holes of steam-turbine rotor blades are presented. Methods of volumetric photoeleasticity with freezing were used for experiments on models of blade elements in the form of plates with oblique holes passing through the plates which are diamond-shaped in the plan of their thickening. The angle between the hole axis and thickening face plane was varied while that between this axis and plane of the plate was fixed. Dependences between thickening parameters and maximum stress values are obtained. These facilitate selection of an optimum version of a structure during design.Translated from Problemy Prochnosti, No. 8, pp. 34–37, August, 1990.