Failure analysis of 1st and 2nd stage rotor blades of an aeroengine

Suresh Kumar, M and Madan, M and Venkataswamy, MA and Sujata, M and Bhaumik, SK (2007) Failure analysis of 1st and 2nd stage rotor blades of an aeroengine. Project Report. National Aerospace Laboratories, Bangalore, India.

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Three failed compressor rotor blades, one from first stage and the other two from second stage, belonging to three different engines were sent to the laboratory for investigation. The first stage blade was found to have a fatigue crack in the airfoil emanating from the leading edge at a distance of about 25 mm from the blade root platform. The crack had a length of about 32 mm. On examination, it was found that the fatigue crack had initiated from a shallow cavity at the leading edge. The cavity was resulted due to solid particle erosion. Such cavities with varying sizes and depth were observed all along the leading edge of the failed blade as well as the blade provided for a comparative study. The failure in both the second stage blades was identical and it was in the form of fracturing of a part of the airfoil at the leading edge near the tip. Examination revealed that the blades have failed by fatigue. Fatigue crack was found to have initiated at foreign object damage (FOD) region. Evidences suggest that in both the cases, the FOD had similar shape with regular undulations on the surface e.g., threaded or corrugated object. The coating was found satisfactory in all the three blades. There were no evidences of corrosion on the blades and no metallurgical abnormalities were found responsible for the failure. The blade material was found satisfactory in terms of chemical composition, microstructure and hardness.

Item Type: Monograph (Project Report)
Uncontrolled Keywords: Aeroengine;Compressor rotor blades;Fatigue;Erosion;FOD
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 27 Jul 2011 06:05
Last Modified: 27 Jul 2011 06:05

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