When the temperature of a body is increased, the stress induced will be
- ATensile stress
- BCompressive stressCorrect
- CBoth (A) and (B)
- DNeither (A) nor (B)
Solution
Concept
Temperature stress in a restrained body
Formula
σ = α E ΔT
Step-by-step solution
1. A rise in temperature tends to expand the body. 2. If the expansion is prevented, a compressive stress develops: σ = α E ΔT.
Explanation
When a body is heated and its expansion is restrained, it is pushed back by the restraints and so compressive stress is induced. (A fall in temperature under restraint produces tensile stress.)
Shortcut
Heat + restraint → compression; cool + restraint → tension.
Common mistake
Choosing tension.
Correct answer: B) Compressive stress