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Civil Engineering QUESTION #6614
Question 1
A steel rod of area $A$ and length $L$ is fixed at both ends. If the temperature increases by $\Delta T$, the thermal stress induced is:
  • $E \alpha \Delta T$✔️
  • $E \alpha \Delta T / L$
  • $A E \alpha \Delta T$
  • Zero, as it is free to expand
Correct Answer Explanation
Thermal strain $\epsilon = \alpha \Delta T$. Since expansion is prevented (fixed ends), the stress is $\sigma = E \epsilon = E \alpha \Delta T$.