Civil Engineering MCQAE Level Civil Engineering
A compound bar: steel rod (1000 mm², E = 200 GPa) and copper tube (2000 mm², E = 100 GPa), same length, rigidly connected, total load 300 kN. Stress in steel is:
Strength of MaterialsCompound Bar StressMEDIUM
Choose the correct answer
A
100 N/mm²
B
120 N/mm²
C
150 N/mm²
D
200 N/mm²
Correct Answer
C. 150 N/mm²
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Same elongation: Ps/Pc = (As×Es)/(Ac×Ec) = (1000×200,000)/(2000×100,000) = 1 → Ps=Pc=150,000 N; σs=150,000/1000=150 N/mm²
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