Fatigue Strength
Fatigue strength is a term applied for nonferrous alloys (Al, Cu, Mg) which do not have a fatigue limit.
- The fatigue strength is the stress level the material will fail at after a specified number of cycles (e.g. 107 cycles).
- In these cases, the S-N curve does not flatten out.
Fatigue life Nf, is the number of cycles that will cause failure at a constant stress level.