Failure analysis of steam turbine moving blades

Madan, M and Suresh Kumar, M and Venkataswamy, MA and Sujata, M and Bhaumik, SK (2007) Failure analysis of steam turbine moving blades. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

The moving steam turbine blades have failed by fatigue. The fatigue crack had initiated at the leading edge in the fractured blade (RR 1031-2) and at the trailing edge in the cracked blade (RR 1031-2). The blade material conformed to the specification and no metallurgical abnormalities were found responsible for the crack initiation. Metrological inspection revealed that the radius at the leading and trailing edges, and the thickness of the blades at these edges were less than that of the specification. It is believed that high stress concentrations arising from these sharp edges were responsible for the premature fatigue crack initiation in the blades.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Steam turbine blade;Fatigue;Stress concentration;Fabrication
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: Ms. Alphones Mary
Date Deposited: 27 Jul 2011 11:39
Last Modified: 27 Jul 2011 11:39
URI: http://nal-ir.nal.res.in/id/eprint/9601

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