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Published on Aug 9, 2016
SN Curve(Fatigue Curve) 1. It is a graph between stress and no.of cycle plotted for fatigue loading. 2. Here fatigue failure is considered. 3. It means a material is subjected to alternate tensile & compressive stresses at the same time. 4. The results of the fatigue testing plotted on a graph is called as 'SN Curve'. 5. In high-cycle fatigue situations, materials performance is commonly characterized by an S-N curve, also known as a Wöhler curve . This is a graph of the magnitude of a cyclic stress (S) against the logarithmic scale of cycles to failure (N).