Failure of a Tail Rotor Blade in a Helicopter

Raghuram, AC and Radhakrishnan, S and Venkataswamy, MA and Krishnan, RV and Ramachandran, V (1988) Failure of a Tail Rotor Blade in a Helicopter. Project Report. National Aerospace Laboratories, Bangalore.

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    Abstract

    During a sortie in a Chetak helicopter, severe vibrations were experienced. On landing, it was . noticed that the outboard rib of a tail rotor blade and the rivets fastening the rib to the blade skin were missing . The skin made of an aluminiumcopper alloy was found torn off at some of the rivet holes. The skin had thinned and the rivet heads reduced in size due to erosion . Stress corrosion cracking .had set in on the skin near the rivet holes . Due to centrifugal forces and the already cracked skin near the rivet holes, the outboard rib with the rivets had been pulled out of the skin. The erosion of the rivet head could have also contributed to the failure.

    Item Type: Proj.Doc/Technical Report (Project Report)
    Uncontrolled Keywords: Helicopter, tail rotor blade, rib, skin, aluminium-copper alloy, erosion, stress corrosion cracking .
    Subjects: 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 Indrani V
    Date Deposited: 10 Aug 2012 10:07
    Last Modified: 10 Aug 2012 10:07
    URI: http://nal-ir.nal.res.in/id/eprint/10682

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