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RMS Stress-Fatigue life estimation

RMS Stress-Fatigue life estimation

(OP)
Hello,

Excuse me for my ignorance, but I am new in stochastic-fatigue analyses. Currently, I am doing a fatigue life calculation due to random vibration (PSD) loads. I have extracted the RMS stress on each critical point and now I have to calculate the number of cycles to failure. Can I use these stresses directly in S-N (Stress Range-Ncycles) curves from DNV or any other standards and compute the Ncycles? Or am I completely wrong?

Thank you in advance

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