Fatigue Fracture of a Compressor Disc of an Aeroengine
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There was an accident to a single engine aircraft. From the eye and ear witness accounts, it was established that the accident occurred because of engine failure. After preliminary examination of the wreckage of the crashed engine, a few suspected components were identified for detailed laboratory investigation. The objective was to establish the primary failure in the engine. While majority of the engine components submitted for laboratory analysis showed secondary damages due to either crash impact forces or post-accident fire, the fracture pattern in one of the compressor disks was different from other components of the engine. Fractographic study revealed that the failure of the disk was by fatigue mechanism. Subsequent investigation showed that the fatigue fracture of the compressor disk was the first in the chain of events that led to the engine failure. This finding was further substantiated through fracture mechanics calculations.
KeywordsAeroengine failure Compressor disk Fatigue fracture Stress analysis
The authors thank Director, the NAL for granting permission to publish this article. The contribution of Mr. M. Madan in sample preparation and experimentation is gratefully acknowledged.
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