Civil Engineering MCQJE Level Civil Engineering
The bending stress at a fibre located at distance y from the neutral axis is given by:
Strength of MaterialsStrength of MaterialsEASY
Choose the correct answer
A
σ = M·y²/I
B
σ = M·y/I
C
σ = M/(y·I)
D
σ = y·I/M
Correct Answer
B. σ = M·y/I
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Bending stress σ = M·y / I (flexure formula). M = bending moment, I = moment of inertia, y = distance from NA. At the extreme fibre y = ymax, stress is maximum (σmax = M/Z where Z = I/ymax = section modulus). At NA, y = 0 so σ = 0.
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