Civil Engineering MCQAE Level Civil Engineering
A hollow circular bar with outer diameter 60 mm and inner diameter 40 mm carries 80 kN tensile load. The tensile stress is approximately:
Strength of MaterialsDirect Stress in Hollow SectionMEDIUM
Choose the correct answer
A
51.0 N/mm²
B
81.5 N/mm²
C
101.9 N/mm²
D
127.3 N/mm²
Correct Answer
A. 51.0 N/mm²
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A = π/4×(60²−40²) = π/4×2000 = 1570.8 mm²; σ = 80,000/1570.8 = 50.9 ≈ 51 N/mm²
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