抄録
In order to evaluate the fatigue strength of blades of an axial flow compressor, we have done the strain measurements in service condition, the fatigue tests on the materials of blade under several conditions (under varying stress amplitude and superimposed stress, in corrosion, etc.) and the fatigue life prediction.
In this paper, the results of strain measurement of 1st and 14th stages of rotor blades and prediction of life are explained. Also the problems in evaluating the fatigue strength of the blade are treated. The main results are as follows;
(1) Stress-frequency curves depend very much on the cycle counting method and the rate of resonance of blade.
(2) Fatigue life is determined by low level stress having many number of cycles rather than the maximum stress level.
(3) The S-N curve estimated can be used to evaluate the service life of blades.
