Failure analysis of tail under carriage strut of a helicopter

Madan, M and Sujata, M and Venkataswamy, MA and Raghavendra, K and Bhaumik, SK (2011) Failure analysis of tail under carriage strut of a helicopter. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

Support assembly of a fractured tail under carriage a helicopter was sent to the laboratory for analysis. Fractographic examination revealed that the under carriage strut had failed under impact load, the crack being initiated from a notch in the form of a fatigue crack front. Analysis suggests that the fatigue crack initiation was due to heavy landing over a period of time. Since a notch was already present, the load during the last landing was responsible for the final fracture. Considering the fact that the fatigue crack depth was only about 1.0 mm, it can be stated that the last landing was quite severe. Possibilities of material defects and/or design deficiencies leading to the failure are ruled out.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Helicopter;Tail under carriage strut;Heavy landing;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: 12 Jul 2011 14:09
Last Modified: 12 Jul 2011 14:09
URI: http://nal-ir.nal.res.in/id/eprint/9351

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