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 generalÂ
- 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,
- 450 MPa seems like a relatively high endurance limit.
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