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Machine Design Miscellaneous
  1. For the given fluctuating fatigue load, the values of stress amplitude and stress ratio are respectively
    1. 100MPa and 5
    2. 250 MPa and 5
    3. 100 MPa and 0.20
    4. 250 MPa and 0.20
Correct Option: C

Stress amplitude =
σmax - σmin
2

=
250 - 50
= 100 MPa
2

Stress ratio =
σmax
 =
50
= 0.2
σmin250


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