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A machine element has an ultimate strength (σu) of 600 N/mm², and endurance limit (σen) of 250 N/mm². The fatigue curve for the element on a log-log plot is shown below. If the element is to be designed for a finite life of 10000 cycles, the maximum amplitude of a completely reversed operating stress is ______N/mm².
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- 386.19 MPa
- 376.19 MPa
- 366.19 MPa
- 385.19 MPa
Correct Option: A
| = | log 250 - log (0.6 × 600) | 6 - 3 |
| ⇒ | = | log 250 - log (360) | 3 |
Sf = 386.19 MPa
