Failure analysis of TDS assembly segment lamination of A helicopter

Madan, M and Bhuvana, R and Sujata, M and Venkataswamy, MA and Bhaumik, SK (2009) Failure analysis of TDS assembly segment lamination of A helicopter. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

Cracked laminations of tail drive shaft assembly of a helicopter were sent to the laboratory for investigation. Fractographic study confirmed that the laminations (marked 1 to 4) have failed by fatigue. There were multiple fatigue crack origins in each lamination. Examination revealed that all the fastener holes on the laminations were either deformed or oblong. Examination also revealed unusual impression marks around the bolt holes of the laminations suggesting that the flat surface of the washers was in contact instead of the convex surface. From the evidences and analysis, it appears that incorrect assembly was the most probable reason for failure.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Helicopter;Tail drive shaft;Lamination;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, Materials Science Division
Depositing User: Ms. Alphones Mary
Date Deposited: 20 Jul 2011 10:05
Last Modified: 20 Jul 2011 10:05
URI: http://nal-ir.nal.res.in/id/eprint/9475

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