Failure analysis of TGB housing of a helicopter

Madan, M and Venkataswamy, MA and Sujata, M and Bhaumik, SK (2005) Failure analysis of TGB housing of a helicopter. Project Report. National Aerospace Laboratories, Bangalore.

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Abstract

The TGB housing had a 14 mm long fatigue crack at the fillet of the lug fusing area of one of the mounting lugs. Examination revealed that the fatigue crack initiation was due to presence of a mechanical stress raiser at the fillet. There were no metallurgical abnormalities and/or casting defects such as voids/porosity at the fatigue crack origin. A series of similar failure on the TGB housings has been investigated in this laboratory in the recent past. Analysis shows that it is necessary to incorporate design modification to prevent early fatigue crack initiation (refer NAL report Nos. MT-FA-946-09-2005 and MT-FA-958-12-2005).

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Helicopter;TGB housing;fatigue
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: Mrs Manoranjitha M D
Date Deposited: 24 Aug 2011 14:42
Last Modified: 24 Aug 2011 14:42
URI: http://nal-ir.nal.res.in/id/eprint/9892

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