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