Investigation of LP Turbine Blade Failure in a Low Bypass Turbofan Engine
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Failure of low pressure turbine rotor blade in a low bypass turbofan engine is analyzed to determine its root cause. Forensic and metallurgical investigations are carried out on the blade failed. The failure has originated from the leading edge and has propagated towards the trailing edge. Intergranular features and high oxidation on the fractured surface are the cause of failure which is probably due to creep-stress rupture. This failure has caused extensive damages in low pressure turbine module and also in downstream modules as a secondary effect. Remedial measures are also suggested to prevent such failures.
KeywordsFatigue Thermal fatigue Oxidation
The authors are very grateful to the Executive Director, Engine Division, Hindustan Aeronautics Limited, General Manager, Foundry & Forge Division, Hindustan Aeronautics Limited, and Chief Executive (Airworthiness), CEMILAC for their kind permission for publishing this paper.
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