Failure analysis of propeller reduction gear shaft of indigenous rotary engine

Madan, M and Sujata, M and Bhaumik, SK (2011) Failure analysis of propeller reduction gear shaft of indigenous rotary engine. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

A failed reduction gear shaft of indigenous rotary engine was sent to this laboratory for investigation. Examination revealed fracture in the collar of the shaft adjacent to the semi-circular groove meant for locking purpose. Fractographic study showed that the fracture was intergranular in nature. Further examination revealed that the shaft was case carburized and hence, the intergranular mode of fracture was a consequence of overload failure. It was discovered that at the location of fracture, because of localized grinding, the collar thickness was reduced to less than one third of that of the original thickness. It was learnt that grinding was carried out because of the problem in fixing the locking bolt. Analysis suggests that the thickness of the collar after the grinding operation was not adequate enough to support the design load and hence, the occurrence of overload failure.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Rotary engine;Reduction gear shaft;Ad-hoc modification; Overload fracture
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division, Materials Science Division
Depositing User: Ms. Alphones Mary
Date Deposited: 07 Jul 2011 14:59
Last Modified: 07 Jul 2011 14:59
URI: http://nal-ir.nal.res.in/id/eprint/9313

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