Failure analysis of collector mesh of a helicopter

Suresh Kumar, M and Madan, M and Venkataswamy, MA and Sujata, M and Parameswara, MA and Bhaumik, SK (2005) Failure analysis of collector mesh of a helicopter. Project Report. National Aerospace Laboratories, Bangalore.

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Abstract

The gear/pinion of the collector mesh has failed by spalling/destructive pitting/wear. Evidences suggest that the failure was due to excessive load on the working flank of the gear/pinion teeth. Analysis shows that inadequate tip relief of gear/pinion teeth would have aggravated the situation further. The material of construction, microstructure, and case and core hardness of the gear/pinion were found to conform to specification. No metallurgical abnormalities were responsible for the failure. It may be noted that a similar failure was investigated earlier in this laboratory (refer NAL Report No. MT-FA-917-05-2005).

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Helicopter;collector mesh;spalling;pitting;overload;tooth tip relief
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, Materials Science Division, Materials Science Division
Depositing User: Mrs Manoranjitha M D
Date Deposited: 15 Nov 2011 09:54
Last Modified: 15 Nov 2011 09:54
URI: http://nal-ir.nal.res.in/id/eprint/9996

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