Civil Engineering MCQAE Level Civil Engineering
A steel bar (cross-section 400 mm², length 1 m, E = 200 GPa) carries an axial tensile load of 80 kN. The strain energy stored is:
Strength of MaterialsStrain Energy in BarMEDIUM
Choose the correct answer
A
20,000 N·mm
B
40,000 N·mm
C
80,000 N·mm
D
160,000 N·mm
Correct Answer
B. 40,000 N·mm
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U = P²L/(2AE) = (80,000)²×1000/(2×400×200,000) = 6.4×10¹²/1.6×10⁸ = 40,000 N·mm
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