Failure investigation of multiplicator of an aeroengine

Sujata, M and Madan, M and Bhaumik, SK (2008) Failure investigation of multiplicator of an aeroengine. Project Report. National Aerospace Laboratories, Bangalore, India.

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Fractographic study confirmed that the driving gear of the multiplicator had failed by fatigue. There was multiple fatigue crack initiation and in all the cases, the fatigue crack had initiated at the tooth root. In two cases, the teeth got fractured and lost by tooth bending fatigue. In another case, after initiation, the fatigue crack had propagated into the hub of the gear and continued propagation further along the hub fillet. After propagation to a critical length, this fatigue crack had resulted in fracturing of a segment of the gear. Following this fracture, the impact with the input gear of the gear cluster had resulted in second fracture and chewing off of remaining teeth in the driving gear. Subsequently, the gear assembly had seized leading to torsional overload failure of the quill shaft transmitting power from the AGB to the multiplicator. The fatigue failure in the driving gear appears to be stress related. Evidences suggest that probably, the load on the gear assembly was more than the usual. The power transmission system down the multiplicator needs to be examined as a whole for establishing the cause(s) for excessive load on the gear assembly.

Item Type: Monograph (Project Report)
Uncontrolled Keywords: Aeroengine;Multiplicator;Gear;Quill shaft;Fatigue failure; Torsional failure
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 20 Jul 2011 04:29
Last Modified: 20 Jul 2011 04:29

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