蒸気タービンロータのフレッティング疲労に関する研究(FP3 設備診断・運用技術2)

概要

論文の詳細を見る
The objectives of this paper are to develop the new method of fretting fatigue test, and to evaluate fretting fatigue strength of several steam turbine rotors. (1) The development of the test method It is said that the fretting fatigue damage of the turbine rotor blade connection area is caused by the relative slide of minute amplitude. During operation, the rotor blade connection area of the high-pressure steam turbine receives radial compression and circumferential tension by a centrifugal force of the blade. And it also receives a vibration force by minute axial swing of the blade. So we developed the test method which can reproduce these states. The test method could well reproduce a typical fretting fatigue crack. (2) The evaluation of the fretting tatigue strength At first, the relationship between the vibration force and the number to fracture was obtained by the tests with and without relative minute slide. As the result, the relative minute slide decreased the number to fracture remarkably. So it was confirmed that the fretting fatigue was caused by the test method. Secondary, the circumferential stress and the centrifugal force of several steam turbine rotors were evaluated, and these states were reflected in the test method. As the results, the fretting fatigue strength of several turbine rotors were grasped relatively.
社団法人日本機械学会の論文
2004-06-22