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.