The assumptions made in the theory of simple bending are:
> The material of the beam is homogeneous this implies that it is uniform in density, strength and have isotropic properties meaning possessing same elastic property in all directions.
> Even after bending the cross section of the beam remains constant.
> During the initial stages the beam is straight and unstressed.
> All the stresses in the beam are within the elastic limit of its material.
> The layers of the beam are free to contract and expand longitudinally and laterally
> On any cross section the perpendicular resultant force of the beam is zero.
> Compared to the cross-sectional dimension of the beam the radius of curvature is very large.
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