Abstract
Square tubes have been used for a framework and reinforcement members of structures. Many studies on the deformation of a circular tube have been done, but there are only a few research reports on a square tube deformation, such as the experiment of axial dynamic deformation and bending stiffness. This paper deals with the influence of axial length and cross-sectional shape on axially compressed aluminum polygonal tube in order to obtain the basic data of buckling, impact resistance and energy absorption. A numerical analysis of the dynamic deformation process of the polygonal tube was made with a finite element method. The result shows that the buckling happens first in the side, and then another buckling happens near the corner. The deformation shape of the tube having an opposite face has concave-convex in adjoining surfaces, and crushed in a bellows-like. That of the tube having no opposite face has slanting deformation. Therefore, the former is suitable for energy absorption than the latter. The absorbed energy of the impact load by tube deformation increases in proportion to the axial displacement of the tube.
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