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A cylindrical shaft is subjected to an alternating stress of 100 MPa. Fatigue strength to sustain 1000 cycles is 490 MPa. If the corrected endurance strength is 70 MPa, estimated shaft life will be
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- 1071 cycles
- 15000 cycles
- 281914 cycles
- 928643 cycles
Correct Option: C
By concept of straight line,
| = | ||
| x - 6 | 6 - 3 |
At y = 2
⇒ x = 5.4501
log10N = 5.4501, N = 281914
