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GATE Mechanical 2023 | Question-8

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

 

  1. $S_{u t}$
  2. $S_2$
  3. $S_3$
  4. $S_4$
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S4 should be the answer. At the endurance limit it doesnt matter how many cycles happen the part will not fail
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