N D E of Helicopter Tail Rotor Blade Using Woodpecker

Togo, M and Brahma, KK and Murthy, CRL (1999) N D E of Helicopter Tail Rotor Blade Using Woodpecker. Technical Report. National Aerospace Laboratories, Bangalore, India.

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On condition monitoring of certain primary structural components of an aircraft/helicopter can result in extra flying hours without compromising on safety. Tail rotor blades of Mi-8 helicopter are one of the primary structural components. Presently, these blades are discarded after their stipulated service life, as given by the manufacturer, though their condition is found to be neither geometrically deteriorated nor material failure is noticed.13; The most common type of defect in a blade at present is found to be debonds in different bonded structures. Extension of debonds beyond certain limits during flight could lead to catastrophic failure. So periodic13; inspection of these blades in service is absolutely essential for safety. Thus, it is necessary to identify effective NDE techniques and establish procedures for detecting debonds in-situ reliably.13; In the present study, an attempt has been made to use woodpecker instrument as a field unit for detecting debonds in the helicopter tail rotor blade even by a non-professional person. The woodpecker is chosen due to its ability to detect debonds with ease in the presence of multiple bonded layers as existing in the blade. The results have also been validated with complementary technique such as Acoustic Impact Test (AIT) techniques using spectral analysis.

Item Type: Monograph (Technical Report)
Uncontrolled Keywords: Tail rotor blade;Helicopter;Debond;Woodpecker;Acoustic impact;Non-destructive evaluation
Subjects: AERONAUTICS > Aircraft Design, Testing & Performance
Depositing User: Mrs Manoranjitha M D
Date Deposited: 05 May 2006
Last Modified: 24 May 2010 04:11
URI: http://nal-ir.nal.res.in/id/eprint/1240

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