Analysis of spalled collector pinion of a helicopter

Madan, M and Sujata, M and Venkataswamy, MA and Bhaumik, SK (2008) Analysis of spalled collector pinion of a helicopter. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

The damaged collector pinion (LH) of a helicopter was forwarded to the laboratory for investigation. The damage was in the form of spalling on the working flank of one of the teeth. The spalling had initiated at the dedendum of the tooth and propagated upward progressively. Analysis showed that the spalling was caused due to high surface contact stresses. The situation was further aggravated due to sliding of the contact surfaces. No metallurgical abnormalities were found responsible for the failure. The microstructure, hardness and the effective case depth were found to be uniform on all the teeth, and they were found to be within specification. . A detailed analysis of the failure is presented in this report. It may be noted that a number of failed collector pinions of another helicopter were investigated in this laboratory in the past (refer NAL Report Nos. MT-FA-917-05-2005, MT-FA-943-10-2005 and MT-FA-1078-12-2007). The present failure is exactly similar to those investigated earlier.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Helicopter;Collector pinion;Spalling;Contact stresses
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: 21 Jul 2011 10:03
Last Modified: 21 Jul 2011 10:03
URI: http://nal-ir.nal.res.in/id/eprint/9511

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