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Fatigue Analysis Kf Value

- May 18, 2024 at 4:41 pm
  
  thtsc96
  Subscriber
  
  Hello,
  I am going to do fatigue analysis for alloy 2024-T6 and alloy 2099. But in fatigue analysis settings there is "Fatigue Strength
  Factor (Kf)" section. What should i do in here? For the aluminium alloys, is there a general Kf value?
  
  Thanks
- May 20, 2024 at 9:22 am
  
  thtsc96
  Subscriber
  
  Is there anybody who can help ?
- May 20, 2024 at 2:04 pm
  
  Daniel Shaw
  Ansys Employee
  
  Kf is just a general modification factor (always equal to or less than 1.0) used to reduce the fatigue resistance. For example, the test specimens used to develop the S-N curve are typically polished, but the actual material might have a rough surface finish. Kf can be used include the surface finish effect.
- May 20, 2024 at 3:46 pm
  
  thtsc96
  Subscriber
  
  Is there a handbook, table or formulation on what the Kf value should be? I am not sure what value I should take.
- May 20, 2024 at 6:40 pm
  
  Daniel Shaw
  Ansys Employee
  
  No. Typically Kf=1. You need to understand how the S-N curve was developed and how the part was manufactured to assess if another Kf is appropriate. Based on that knowledge, you might be able to find a reference that discusses the appropriate Kf.

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