Comment on "Notch Size Effects in the Fatigue Limit of Steel" by M. Makkonen [Int J Fatigue 25 (2003) 17-26]

A fatigue crack growth (FCG) model under constant amplitude loading has been developed considering energy balance during growth of the crack. Plastic energy dissipated during growth of a crack within a small area, known as process zone at the tip of the crack and area below cyclic stress-strain curve was used in the energy balance. The predictions of model are in good agreement with the experimental results.