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Moment of Inertia of a Rod

In a structur...

Question

In a structure subjected to fatigue loading, the minimum and maximum stresses developed in a cycle are 200 MPa and 400 MPa respectively. The value of stress amplitude (in MPa) is .
100

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Solution

The correct option is A 100
$σ_{m i n} = 200 M P a$

$σ_{m a x} = 400 M P a$

$σ_{a} = \frac{σ_{m a x} - σ_{m i n}}{2} = \frac{400 - 200}{2}$

= 100 MPa

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