Q:
A steel bar 600mm long and having 30mm diameter, is turned down to 25mm diameter for one fourth of its length. It is heated at 30 C above room temperature, clamped at both ends and then allowed to cool to room temperature. If the distance between the clamps is unchanged, the maximum stress in the bar ( ? = 12.5 x 10-6 per C and E = 200 GN/m²) is
Answer & Explanation
Answer: D) 75 MN/m²
Explanation: As temperature stress do not depend upon properties of cross section like length and area. They only depends upon properties of the material.
Therefore, ?=?E?T
= 12.5 x 10-6 x 200 x 10³ x 30
= 75 MN/m².
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