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Ansys Learning Forum › Forums › Discuss Simulation › General Mechanical › Fatigue Analysis of bolts › Reply To: Fatigue Analysis of bolts

November 17, 2023 at 4:24 pm
Federico Parisini
Subscriber

Thank you for the time you're dedicating, but I have a question for each of the options you proposed.

  1. I have Ansys student 2023 R2, and I have Ncode Mechanical embedded design life, which I'm not sure if it's the correct add-on. Is there a manual for its use?

  2. I'm not clear on what I need to do for this option. I have the material data for the screws defined with S-N curves related to specific mean stresses, taken from a paper. I thought that subsequently, the program would automatically make its considerations regarding these curves. What you're suggesting is for me to manually calculate the S-N curve related to the yield strenght and use that in the simulation? How do I set it if I've defined the material with multiple curves to determine which curve it should refer to?

3. Have I to perform the analyses in the two environments in two steps each (1: bolt pre-tension, 2: external force)? 
Then if I have an external force of 2000 N, do I need to input a force of 1000 N in the first environment and a force of -1000 N in the second one? Even if the load is zero-based and not fully reversed?

Thank you again.