A) Tensile stress
B) Compressive stress
C) Shear stress
D) No stress

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Explanation:

As per theory of thermal stresses, when a body is restricted from free expansion or contraction, it develops internal stresses when subjected to change in temperature.

If a constrained part is heated, it tends to expand. But restriction to movement causes development of compressive stresses within the body.

On the other hand, tensile stresses develop when a constrained body is cooled.

References:

  1. Mechanics of Materials, Gere & Timoshenko
  2. IS 4592:2022 – Code of Practice for Design and Construction of Foundations for Transmission Line Towers and Poles

Therefore, option B is the correct answer. Heating of a constrained part leads to development of compressive thermal stresses within it.

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