Abstract: The mechanism and deformation behavior of the thin strip central buckling are studied by using analytical and experimental methods. The analytical model of thin strip buckling and post buckling is established in order to verify the results of the analytical model, the rolling experiment is carried out in test rolling mill. In those experiments, a variety of different central buckling models are obtained by designing different roll-shaped curves for work roll, and the geometric parameters of the central buckling are measured. The corresponding parameters of rolling equipment and the aluminum sheet are also obtained. By using the analytical model, the critical central buckling stress for the conditions of rolling experiment is achieved on the basis of the principle of least work, the path generation of post buckling is found with perturbation-variational solution, and the model of the post buckling is in good agreement with the result of experiment. Simulation analysis for the conditions of rolling experiments is established by using ANSYS, the model of buckling is obtained, which is in good agreement with the experimental results, and the critical buckling stress of this buckling model is also achieved, thus proving the correctness of the finite element model and its calculation results, and further verifying the analytical calculation results.

Key words: Analytical method, Buckling, Finite element method, Post buckling, Rolling experiment, Thin cold-rolled sheet