Failure analysis of components belonging to an aeroengine

Sujata, M and Madan, M and Venkataswamy, MA and Bhaumik, SK (2008) Failure analysis of components belonging to an aeroengine. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

There was an incidence to an aircraft wherein the pilot heard a loud bang on accelerating throttle to max dry rpm at line up. After preliminary examination, a few suspected components of the damaged engine were forwarded to the laboratory for identification of mode and cause of failure. Examination revealed that failure of one of the first stage low-pressure compressor blades was the first in the chain of events that led to the engine failure. Fractographic examination showed that the compressor blade had failed by fatigue. The fatigue crack had initiated at the fillet of the blade mounting lug. Fatigue cracks were found present at the fillet of all four mounting lugs of this blade. Similar cracks were also noticed in two more blades adjacent to the fractured blade. It was established that the stress raisers arising due to absence of fillet radius was the primary reason for the fatigue crack initiation. The blade material and the microstructure were found to conform to specification. A detailed analysis of the failure is presented in this report.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Aeroengine;Compressor blade;Fatigue failure;Stress raisers
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division
Depositing User: Ms. Alphones Mary
Date Deposited: 20 Jul 2011 10:00
Last Modified: 20 Jul 2011 10:00
URI: http://nal-ir.nal.res.in/id/eprint/9479

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