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Ansys Learning Forum › Forums › Discuss Simulation › General Mechanical › Stress too high in transient simulation. › Reply To: Stress too high in transient simulation.

September 9, 2024 at 1:51 pm
Daniel Shaw
Ansys Employee

If you are sure that the alternating stress is below the endurance limit, you can assume infinite life. Based on the S-N curve that you showed, this material appears to have a well-defined endurance limit at about 450 MPa, but in general 

  1. Not all materials have a well-defined endurance limit.  So, if the part experiences very high cycle fatigue, you may not be able to assume infinite life,
  2. 450 MPa seems like a relatively high endurance limit.