Metallurgical Failure Analysis of Cracked ARIS Casing Ring of a Helicopter

Sujata, M and Madan, M and Venkataswamy, MA and Raghavendra, K and Bhaumik, SK (2011) Metallurgical Failure Analysis of Cracked ARIS Casing Ring of a Helicopter. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

A cracked ARIS casing ring belonging to a helicopter was forwarded to this laboratory for analysis. Examination revealed a crack in one of the fastener holes on one of the flanges meant for fixing torsion torque plates. The crack was found to have initiated at corrosion pits on the fastener hole surface and propagated progressively by fatigue mechanism over more than 95% of the cross sectional area. Considering the area fraction over which the fatigue crack has propagated, it can be stated that the fatigue was of low stress – high cycle type. The material of construction was found to conform to design specification, and no metallurgical abnormalities were responsible for the failure.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Helicopter;ARIS casing ring;Corrosion;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: 14 Jul 2011 16:38
Last Modified: 14 Jul 2011 16:38
URI: http://nal-ir.nal.res.in/id/eprint/9360

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