Using the Wheeler model for predicting fatigue crack growth as a case study, the likely errors in prediction from selecting literature calibration values are examined. From four methods of representing the same da/dN - δK data, errors in crack life prediction up to a factor of about three were obtained.
Because calibration values are stress scale dependent, the influence of interpolations and extrapolations on predicted crack growth life is also examined. Large extrapolations may lead to errors in predicted life, also approaching a factor of three.
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