Analysis of pins and labyrinth of an aeroengine

Venkataswamy, MA and Sujata, M and Keshab , Barai and Bhaskaran, TA and Bhaumik, SK (2003) Analysis of pins and labyrinth of an aeroengine. Project Report. National Aerospace Laboratories, Bangalore.

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Abstract

Labyrinth ring and pins withdrawn from an aeroengine were sent to the laboratory to establish the reasons for the development of cracks, if any. Dye penetrant examination revealed cracks at about 4.5 mm from the pinhead in 27 pins out of the 60 pins received for investigation. Microstructural examination and fractographic studies indicated that the cracks had initiated by fatigue, at the deformation mark at the disc/labyrinth ring interface, possibly due to axial movement of the labyrinth ring. It appears most probable that the differential thermal expansion of the ring and the disc resulted in loss interference between the disc and the labyrinth ring leading to axial movement of the ring.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Aeroengine;labyrinth pins;fatigue cracks
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: Mrs Manoranjitha M D
Date Deposited: 14 Jul 2011 16:39
Last Modified: 11 Oct 2012 10:44
URI: http://nal-ir.nal.res.in/id/eprint/9358

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