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General Mechanical

General Mechanical

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Low Cycle Fatigue

    • March 4, 2024 at 1:10 pm
      Jeonee
      Subscriber

      Hi,

      I have done high cycle fatigue analysis (S-N Time Series) and obtained 4392 cycles. Should I do low cycle fatigue analysis (E-N Time Series) again?

    • March 6, 2024 at 2:44 pm
      danielshaw
      Ansys Employee

      Probably.  SN is only valid for high-cycle fatigue (HF) using elastic stresses.  A predicted fatigue life for a ductile metal of only 4392 cycles is probably indicating low-cycle fatigue (LCF) produced by plastic strains.  The predicted life of 4392 cycles is probably conservative, but if you want a more accurate life prediction, you should use EN.

      • March 6, 2024 at 7:24 pm
        Jeonee
        Subscriber

        Yes, this analysis for Al7075-T6 and conservative. Certainty of survival is 95% 

        Thank you so much for answer

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