Elasto-Plastic Buckling and Post-Buckling of Internal Pressurized Torispherical Pressure Vessel

Elasto-plastic buckling and post-buckling of internal pressurized torispherical shell is analyzed by ABAQUS.Asymmetric mesh technology is an effective way to break symmetry and to induce the bifurcation buckling for simulating the buckling behavior of torispherical shell under internal pressure by Riks method.The buckling load is captured from the load-deflection curve of a typical point within the buckled zone.The results show that:As the internal pressure increased above some critical value,a wave like band had appeared in the knuckle region.After formation of the wave like deformation the pressure can be further increased substantially,causing the formation of visible buckles in the knuckle region.The post-buckling behavior can be departed as two phases:the first phase and the second phase.Initial imperfections have been introduced to the model.The post-buckling behavior has been affected by the location of the imperfections,and the bifurcation load has decreased caused by the initial imperfections.