Civil Engineering MCQAE Level Civil Engineering
A railway rail is laid at 20°C. If temperature can rise to 50°C (α=12×10⁻⁶/°C, E=200 GPa) and expansion is prevented, the stress is:
Strength of MaterialsRailway Rail Thermal StressEASY
Choose the correct answer
A
36 N/mm²
B
48 N/mm²
C
72 N/mm²
D
144 N/mm²
Correct Answer
C. 72 N/mm²
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σ=EαΔT=200,000×12×10⁻⁶×30=72 N/mm² compressive
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