Abstarct: In this research, ratcheting behavior of stainless steel 304 cylindrical and Quadrangle shells with cutout and without cutout under cyclic Pure bending moment were studied numerically and experimentally. In ratcheting analysis, the shells were fixed horizontally and subjected to force-controlled cycling with non-zero mean force at the end of them which causes the accumulation of plastic strain or ratcheting phenomena. Loading is involved load-Control and Displacement-control. Experimental tests were performed by a servo-hydraulic INSTRON 8802 machine. The numerical analysis was carried out by Abaqus using the advanced nonlinear isotropic/kinematic hardening model and results of numerical analysis were compared to experimental results. In this research, the effect of Load’s amplitude, Load’s mean, displacement’s amplitude, length of under pure bendenig, Diameter and geometry of shells on ratcheting behavior were investigated. baxsed on the results, it was found that with increasing of Load’s amplitude and Mean’s load increase in plastic deformations due to the fact of pure bending increasing and rate of ratcheting displacement decrease reaches a constant value. Also, circular cutout effect on cylindrical shells under these kinds of loading has been studied and observed that creating of cutout increases the plastic deformation and it’s rate.