Axial Static Buckling Analysis Of Regular Polygonal Corrugation Tubes

In this paper, regular polygonal corrugation tubes are used as the object of research, which are BC corrugation sandwich board after die cutting, indentation, folding and set or paste together. The structural stability of regular polygonal corrugation tube is analyzed. The buckling mode and structural stability of regular triangle, square, regular pentagon and regular hexagonal tubular structures are studied. The main works include:(1) The equivalent treatment of paper corrugation board. The corrugation sandwich panel was treated as orthogonal anisotropic plate. The transverse and longitudinal flexural rigidity of the equivalent orthotropic plate were equal to the flexural rigidity of the paper corrugation plate,and then the thickness of the equivalent plate was calculated.(2) The buckling load formulas of regular polygonal corrugation tubes were established.The regular polygonal corrugation tube was simplified as an orthotropic sheet of simply supported sides. The buckling load of the side plate was calculated by using the bending control equation of the thin plate. And then the buckling loads of the regular polygonal corrugation tubes were deduced.(3) The buckling loads of regular polygonal corrugation tubes were tested and analyzed.The regular triangle, square, regular pentagon and regular hexagonal paper corrugation tubes of the side length, height and speed of the tubes were axial compressed to obtain the buckling loads. Theoretical and experimental results under axial static compression were compared and analyzed. It was found that the theoretical data of square paper corrugation tube was closer to the experimental results. The differences between theory and practice were fund out, and the theoretical derivation process was revised.(4) The structural instabilities of regular polygonal corrugation tubes were analyzed. The deformation law of L-shaped structure and spring structure were analyzed, and the steps and the deformation law of L-shaped structure and spring structure were analyzed, and the steps and the buckling process were analyzed with considering the overall structural stability. After the side plate was symmetrically buckled, the deflection of the side plate was faster and more prone to buckling deformation, and the deflection surface of the side plate changed gradually with the load increasing.