Abstract
AbstractComprehensive 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.
Highlights
EPRI organised an international research project [1], where ultrasonic testing was used to determine the fatigue limit of plain specimens of 12% Cr steel at R > 0 with artificially produced, sub-mm size corrosion pits
The plain fatigue limit of uncorroded specimens was determined at R > 0, and fatigue-crack-growth testing, including the threshold, was carried out at R-values ranging from −1 to
This comprehensive set of fatigue data constitutes an ideal basis for investigating the capability of a variety of methods to predict the fatigue limit of pitted specimens
Summary
EPRI organised an international research project [1], where ultrasonic testing was used to determine the fatigue limit of plain specimens of 12% Cr steel at R > 0 with artificially produced, sub-mm size corrosion pits. The plain fatigue limit of uncorroded specimens was determined at R > 0, and fatigue-crack-growth testing, including the threshold, was carried out at R-values ranging from −1 to This comprehensive set of fatigue data constitutes an ideal basis for investigating the capability of a variety of methods to predict the fatigue limit of pitted specimens.
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