Multiple choice

Directions: Carry One Mark Each.

For the given fluctuating fatigue load, the values of stress amplitude and stress ratio respectively are

  1. 100 MPa and 5

  2. 250 MPa and 5

  3. 100 MPa and 0.20

  4. 250 MPa and 0.20
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A Correct answer
Explanation

$\text{For given fluctuating load, stress amplitude is}\\ =\frac{\sigma_{max}-\sigma_{man}}{2}=\frac{250-50}{2}=\frac{200}{2}=100MPa\\ \text {and stress ratio is}\\ =\frac{\sigma_{max}}{\sigma_{min}}=\frac{250}{50}=5$

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