Analysis on the spalling of collector pinion of a helicopter

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

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Abstract

A damaged collector pinion (LH) of a helicopter was forwarded to the laboratory for investigation. Examination revealed spalling on the working flank of one of the teeth. The spalled region showed presence of beach marks, characteristics of surface contact fatigue. The subsurface crack(s) was found to have initiated at the bottom of the dedendum and propagated progressively upward. The spalled region encompassed the top land of the tooth as well. Evidences suggest that excessive contact stresses and gear tip biting were responsible for the early initiation of spalling. In general, the contact pattern on the pinion teeth was found unfavorable which showed tip biting at the bottom of the dedendum and contact right up to the top land.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: 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: 20 Jul 2011 09:53
Last Modified: 20 Jul 2011 09:53
URI: http://nal-ir.nal.res.in/id/eprint/9496

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