When we do fatigue life analysis we need to use the S-N curve for it which requires Stress amplitude (Y-Axis on S-N Curve). When we are performing FEA in ANSYS, we get the output in terms of von Mises or principal stress. My question is how to predict this stress Amplitude value from FEA result? is it directly coming from von Mises Stress or Principle Stress or is there any other method?
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