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The S-N curve from a fatigue test for steel is shown. Which one of the options gives the endurance limit?

1. S_ut
2. S₂
3. S₃
4. S₄

Correct answer: S₄

Solution

The endurance limit is defined as the maximum stress level below which a material can endure an infinite number of loading cycles without failing. In the S-N curve, S₄ represents this threshold for the steel, indicating the stress level where fatigue failure does not occur.

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