Fatigue fracture of crankshaft of an aircraft engine

The crankshaft of a piston engine of a transport aircraft failed during climb. Cracks were found to initiate at the web radius region of journals 2 and 3 and progressed in the transverse direction of the shaft axis causing it to fracture. The initiation of cracks was by surface contact fatigue due t...

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Bibliographic Details
Published in:Engineering failure analysis 2002-06, Vol.9 (3), p.255-263
Main Authors: Bhaumik, S.K, Rangaraju, R, Venkataswamy, M.A, Bhaskaran, T.A, Parameswara, M.A
Format: Article
Language:English
Subjects:
Aircraft failures
Bearing failures
Engine failures
Fatigue
Fretting
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Summary:The crankshaft of a piston engine of a transport aircraft failed during climb. Cracks were found to initiate at the web radius region of journals 2 and 3 and progressed in the transverse direction of the shaft axis causing it to fracture. The initiation of cracks was by surface contact fatigue due to constant rubbing of bearings against the journal webs. The movement of the bearing was caused by some axial load on the crankshaft. An analysis of the failure is presented in this paper.
ISSN:1350-6307
1873-1961
DOI:10.1016/S1350-6307(01)00022-X