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Journal of Failure Analysis and Prevention

, Volume 12, Issue 6, pp 617–623 | Cite as

Failure Investigation of an Aircraft Crankshaft Gear Connection

  • Michael Stevenson
  • David Klepacki
  • Jeff McDougall
  • Dale Alexander
Case History---Peer-Reviewed
  • 383 Downloads

Abstract

Improper assembly of an aircraft crankshaft can have serious consequences. If an adequate joint clamping force is not applied to the connection between the crankshaft and crankshaft gear during assembly, relative motion in the system could create flexural loads on connection components, and cause damage such as cyclic fatigue cracking, shear overstress fracture, and plastic deformation. Many factors can contribute to insufficient joint clamping, including poor joint seating, the presence of a foreign object on the faying surface, and failure to apply proper torque during assembly. This paper reviews a case involving a crankshaft gear connection, which separated while the subject aircraft was in flight, causing the engine to fail and the aircraft to crash. To determine the root cause of the failure, a metallurgical analysis was performed.

Keywords

Crankshaft gear connection Cyclic fatigue cracking Joint clamping 

References

  1. 1.
    ASM: Fatigue Fracture Appearance, ASM Handbook, vol. 11, pp. 627–640. ASM, Washington (2002)Google Scholar
  2. 2.
    O’Brien, M.J., Metcalfe, R.G.: High strength engineering fasteners: design for fatigue resistance. J Fail Anal Prev 9, 171–181 (2009)CrossRefGoogle Scholar
  3. 3.
    Wulpi, D.: Understanding How Components Fail, 2nd edn, pp. 141–145. ASM International, Materials Park (1999)Google Scholar
  4. 4.
    Bickford, J.: An Introduction to the Design and Behavior of Bolted Joints, 3rd edn, pp. 3–13. Marcel Dekker, New York (1990)Google Scholar

Copyright information

© ASM International 2012

Authors and Affiliations

  • Michael Stevenson
    • 1
  • David Klepacki
    • 1
  • Jeff McDougall
    • 1
  • Dale Alexander
    • 1
  1. 1.Engineering Systems Inc.AuroraUSA

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