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Influence of pitting on the fatigue life of a turbine blade steel
Author(s) -
ShengQi Zhou,
A. Turnbull
Publication year - 1999
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1046/j.1460-2695.1999.00226.x
Subject(s) - blade (archaeology) , materials science , service life , stress intensity factor , structural engineering , turbine blade , metallurgy , stress concentration , turbine , stress (linguistics) , intensity (physics) , fatigue testing , crack closure , composite material , fracture mechanics , engineering , mechanical engineering , linguistics , philosophy , physics , quantum mechanics
The role of pits as stress raisers and their influence on fatigue life has been investigated for a 12Cr turbine blade material. A particular feature of this work was the establishment of an electrochemical procedure for generating pits with ‘controlled’ pit depth and low density. Pits grown under laboratory conditions were partially spherical in shape and simulated, in general appearance, those observed in service. In terms of the threshold stress intensity factor, the results supported the concept of pits acting as effective cracks of the same depth, provided that a short crack model based on an effective crack length is used.