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The material,
The geometry,
The predicted maximum stress on the part,
The realistic chemical environment around the part,
The loading spectra,
A reasonable value for maximum stress on the part,
The time or cycles to nucleate pits (L1) - can be estimated from pit growth rate experimental data at different stress levels including the predicted maximum stress on the part,
Quantified depth of pits from either damage tracking or failure analysis or both,
"Short" crack behavior of the material, such as fatigue crack growth rate data in the "short" crack regime and the "short" crack threshold stress intensity value,
The Mode I fatigue crack growth rate data in a realistic corrosive environment including empirical parameters, C and n,
Certain material parameters, such as the Mode I threshold stress intensity value as a function of frequency, environment, waveform, and R value, and
Fatigue crack propagation data for evaluating the effect of prior corrosion on the fatigue crack propagation behavior of the component.
Review of Pitting Corrosion Fatigue Models, D.W. Hoeppner, V. Chandrasekaran, and A.M.H. Taylor, University of Utah and FASIDE International Inc.