Thus, safe fatigue design is guaranteed in the purely elastic domain defined by the cyclic yielding. Comparison of cyclic strength and fatigue limit reveals that they are approximately equal.
A typical S-N curve in stress-life approach for fatigue analysis has a distinctive minimum stress lower bound, the fatigue endurance limit. Both values of strengths are identified using a two-step procedure of the experimental stress-strain curves fitting with application of Ramberg-Osgood and Chaboche material models. Cyclic yield strength is defined on a cyclic stress-strain curve, while monotonic yield strength is defined on a monotonic curve. This study proposes cyclic yield strength as a potential characteristic of safe design for structures operating under fatigue and creep conditions.
