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ASM Failure Analysis Case Histories

Handbook of Case Histories in Failure Analysis

Edited by
Khlefa A. Esaklul
Khlefa A. Esaklul
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ASM International
Volume
2
ISBN electronic:
978-1-62708-215-0
Publication date:
1993
Book Chapter

Fatigue Fracture of a Transport Aircraft Crankshaft During Flight

By
A.K. Das
A.K. Das
Aircraft Design Bureau, Hindustan Aeronautics Ltd.
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Published:
1993
Page range:
36 - 38

Abstract

A 4340 steel piston engine crankshaft in a transport aircraft failed catastrophically during flight. The fracture occurred in the pin radius zone. Fractographic studies established the mode of failure as fatigue under a complex combination of bending and torsional stresses. SEM examination revealed that the fracture origin was a subsurface defect-a hard refractory (Al2O3) inclusion—in the zone close to the pin radius. Chemical analysis showed the crankshaft material to be of inferior quality. It was recommended that magnetic particle inspection using the dc method be used to cheek for cracks during periodic maintenance overhauls.

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A.K. Das, 1993. "Fatigue Fracture of a Transport Aircraft Crankshaft During Flight", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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