Which of the following is an INCORRECT bending equation based on the theory of pure bending? Where, M= Bending moment, I = Moment of inertia exerted on the bending axis, σ = Stress of the fibre at a distance 'y' from neutral/centroidal axis, E = Young's Modulus of beam material, R = Curvature radius of this bent beam and Z = Section modulus of the section.
1
M = σZ
2
\(\frac{σ}{Y} = \frac{E}{R}\)
3
\(σ = \frac{EI}{MR}\)
4
\(\frac{M}{I} = \frac{E}{R}\)
5
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