Failure analysis of collector gear of a helicopter

Madan, M and Venkataswamy, MA and Sujata, M and Bhaumik, SK (2007) Failure analysis of collector gear of a helicopter. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

A tooth of the collector gear of a helicopter has failed by fatigue. Multiple fatigue cracks were found to have initiated at the spalled region on the working flank of the tooth and propagated simultaneously across the thickness to critical lengths before giving way to final overload failure. Examination revealed spalling, destructive pitting and wear on all the teeth of the sector of the gear provided for investigation. The damages were predominantly observed below the pitch line. Severe wear and sliding marks were observed over a band on the dedendum of the flank suggesting unusual loading during the tooth withdrawal cycle.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Helicopter;Collector gear;Spalling;Pitting;Fatigue; Decarburization;Distortion;Unusual loading
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division
Depositing User: Ms. Alphones Mary
Date Deposited: 29 Jul 2011 12:15
Last Modified: 29 Jul 2011 12:15
URI: http://nal-ir.nal.res.in/id/eprint/9584

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