How can I estimate fatigue life for a simple specimen like a round bar ?

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Claes Richard Fredö

Take a look at DNV Recommended Procedure 203,

https://rules.dnvgl.com/docs/pdf/DNV/codes/docs/2011-10/RP-C203.pdf

which outlines many things about design with respect to fatigue.

Sincerely

Claes

Arash Mohammadzadeh Gonabadi

you can use Abaqus or Ansys or Cosmos to determine the fatigue.

Ahmad Hadizadeh

Thank you Claes & Arash.