The fatigue growth of surface flaws in both smooth and notched round barssubjected to rotary bending was numerically simulated by means of a twoparametertheoretical model proposed by the first author. The stress intensityfactor distribution along the crack front was needed in order to apply themodel. Therefore, finite element analyses and the superposition principle wereused to determine such a distribution for a wide range of crack configurationsand any position of the flaw with respect to the bending moment axis. Theresults related to rotary bending are compared to those related to pulsatingcyclic bending, and a qualitative comparison is made with some data reportedin the literature.
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