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A criterion for the mean stress effect correction in the shift factorapproach for variable amplitude life prediction is presented for both smoothand notched specimens. The criterion is applied to the simple idea proposed bythe authors in a previous note that Ga{\ss}ner curves can be interpreted asshifted W\"ohler curves. The mean stress correction used has been proposed bySmith, Watson and Topper and, more in general, by Walker. By applying thecorrection, a new expression for the shift factor G is obtained and, throughthe application of the theory of the critical distances in its point variant,surprisingly G is demonstrated to be valid for both smooth and notchedgeometries since it does not seem to depend on the geometry, but only on thefatigue exponent and the loading history. Finally, a comparison with the SAEKeyhole test program data is added to substantiate the findings.

Mean stress effect on Ga{\ss}ner curves interpreted as shifted W\"ohler curves