Pure Bending

PURE BENDING

FIGURE  1

FIGURE  2

whenever the structure is applied with some magnitude of load, then there is a resultant of shear force and a couple simultaneously.consider the above figures we can observe that some part of the beam is 

resulted to negligible or zero shear force but at the same part of the structure, the bending moment is maximum or constant.Therefore, pure bending  is the condition of stress where the bending moment is maximum or constant  simultaneously the shear force or the torsional force is zero or negligible.