Ratcheting behavior of pressurized lateral nozzle of cylinder with local wall thinning under different loading paths

Abstract

Ratcheting effect of pressurized lateral nozzle of cylinder with local wall thinning is studied using Chaboche model in ANSYS. Firstly, the influence of internal pressure, bending loading, loading path, loading history and the different defect sizes on ratcheting effect of pressurized oblique nozzle with local wall thinning is studied in this study. The results indicate that ratcheting strain increased with the increasing of internal pressure and bending moment and is affected by the different loading paths and loading history. Secondly, the effect of different defect sizes such as defect depth, depth length and defect hoop angle on ratcheting behavior of pressurized oblique nozzle with local wall thinning is studied. The results investigated that ratcheting strain of the lateral nozzle of cylinder with local inside wall thinning under cyclic bending increased with the increasing of defect depth, had no relationship with the increasing of defect length and ratcheting strain of the lateral nozzle of cylinder with local wall thinning under cyclic bending increased with the increasing of defect circumferential angle. Finally, the ratcheting boundary of pressurized lateral nozzle of cylinder with different defect size is determined by linear matching method. The results show that the increase of the defect depth could induce a remarkable increase of the reverse plasticity and the ratchet limits of the component, the defect length has a slight effect on the reverse plasticity and ratchet limits of the component and the increase of the defect circumferential angle could induce a remarkable increase of the reverse plasticity and the ratchet limits of the component.