Journal
ENGINEERING FAILURE ANALYSIS
Volume 18, Issue 8, Pages 1998-2007Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfailanal.2011.05.017
Keywords
Aircraft failures; Shafts; Failure analysis; Finite element analysis
Funding
- Military Technical Institute (Ministry of Defense of the Republic of Serbia)
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This paper analyzes failure causes of the combat jet aircraft rudder shaft (RS) which occurred during the flight mission. A finite element method (FEM), utilized to determine the stress state of the RS subjected to hinge moment ultimate load, resulted in the high stress concentration sites around the rivet holes. The longitudinal crack was initiated from the corrosion pit in the zone of the rivet hole, where the fatigue beach marks were observed. The inner surface of the RS was heavily corroded. Moreover, pitting corrosion has destroyed approximately 50% of the wall thickness. Based on the presented results it was concluded that the failure of the RS had a character of fatigue combined with heavy corrosion. Therefore, it is recommended that the RS should be redesigned; the material changed into more corrosion resistant one and the maintenance procedure changed in order to avoid future similar failures. (C) 2011 Elsevier Ltd. All rights reserved.
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