Civil Engineering MCQAE Level Civil Engineering
Rod fixed at both ends, temperature drops 40°C. α=10×10⁻⁶/°C, E=200 GPa. Thermal stress:
Strength of MaterialsThermal Stress Temperature DropMEDIUM
Choose the correct answer
A
40 N/mm² tension
B
60 N/mm² tension
C
80 N/mm² tension
D
80 N/mm² compression
Correct Answer
C. 80 N/mm² tension
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σ=EαΔT=200,000×10×10⁻⁶×40=80 N/mm²; cooling→bar tries to contract→tension if constrained.
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