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Short‐crack modelling of the effect of corrosion pits on the fatigue limit of 12% Cr steel
Author(s) -
Härkegård G.
Publication year - 2015
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 - 10.1111/ffe.12305
Subject(s) - materials science , corrosion fatigue , metallurgy , corrosion , steam turbine , structural engineering , yield (engineering) , limit (mathematics) , fatigue limit , fatigue testing , crack closure , composite material , forensic engineering , fracture mechanics , engineering , mathematics , mechanical engineering , mathematical analysis
Comprehensive data on the fatigue limit of smooth uncorroded specimens and specimens with single corrosion pits of a 12% Cr steel for steam‐turbine blades have been generated by means of ultrasonic fatigue testing. The threshold for fatigue‐crack growth has also been determined. Available (short‐)crack models due to El Haddad and Härkegård and Smith and Miller generally yield safe predictions for the fatigue limit of the pitted specimens, whereas Murakami's √ area model yields inconsistent predictions in the present case.