Abstract
Fatigue strength of cylindrical specimens with small circumferential notches was determined for a high stress cycle asymmetry. The steel test bars were detracted from a railway wheel set made of an experimental melt. It has been shown that the fracture-mechanical approach to the description of the notch effects in fatigue reliably predicts both (a) the fatigue notch factor for asymmetrical loading and (b) the maximum size of non-damaging notches.

Key words
fatigue notch factor, non-damaging notches, mean stress

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