Defect investigation of failed VIth stage compressor rotor rig blades

Parameswara, MA and Sujata, M and Venkataswamy, MA and Suresh Kumar, M and Madan, M and Bhaumik, SK (2005) Defect investigation of failed VIth stage compressor rotor rig blades. Project Report. National Aerospace Laboratories, Bangalore.

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Out of the 41 blades referred to NAL, 36 blades have failed by fatigue. In all the blades, the fatigue cracks were similar in nature and they got initiated at the convex and/or concave surface of the airfoil just above the blade root platform. There were no metallurgical and/or mechanical abnormalities at the fatigue crack origins. The fatigue is stress related and of high cycle – low stress type. Failing of about 85% of the blades by fatigue is unusual and cannot happen unless there is wrong material selection and/or resonance in the blades.

Item Type: Monograph (Project Report)
Uncontrolled Keywords: Compressor blades;resonance;material selection
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Mrs Manoranjitha M D
Date Deposited: 05 Dec 2011 11:19
Last Modified: 05 Dec 2011 11:19

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