Comments on the report submitted by Rolls-Royce on “Pegasus Mk. 151-32 HPT blade cracking

Bhaumik, SK (2007) Comments on the report submitted by Rolls-Royce on “Pegasus Mk. 151-32 HPT blade cracking. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

The report submitted by Rolls-Royce on “Pegasus Mk. 151-32 HPT blade cracking was examined. Study revealed that the evidences provided in support of forced fitment of the coverplate are consistent. The reason established for the failure of the blade tangs as a result of this forced fitment is logical. This has been supported by the observations made during dis-assembly of the HPTR disc and measurements on coating thickness. From the photographs, there appear to be strong factual evidences in justifying the conclusions drawn by Rolls-Royce. But, the failure mechanism established for fractured/cracked tangs does not appear logical. It is likely that the failure of the tangs was by fatigue either due to assembly stresses or due to generation of overload cracks during fitment of the coverplate. However, the conclusions drawn by Rolls-Royce remain valid even if the failure mechanism of the blade tangs was by fatigue. The comments on the findings of Rolls-Royce are presented in this report.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Pegasus engine;HPTR blades;Tang failure
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division
Depositing User: Ms. Alphones Mary
Date Deposited: 25 Jul 2011 11:16
Last Modified: 25 Jul 2011 11:16
URI: http://nal-ir.nal.res.in/id/eprint/9519

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