斜め方向からの圧縮荷重を受ける階段状の円筒の入り込み変形

概要

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In this paper, crushing behaviours of stepped circular tubes subjected to oblique load are studied by using finite element method. It is found that the deformation behaviour of stepped tubes can be classified into two modes (Stable mode and Unstable mode). For the case of the Stable mode, the tube keeps erection in comparison and absorbs compressive energies as much as axial load. However, in the Unstable mode, the tube does not keep erection in comparison and its compression loads are much lower than those in its axial crushing. Also, it is found that the compressive load of the stepped tube in the oblique crushing increases as the difference between the radius of large tube and small tube decreases and as the total length of the tube increases. When the geometric sizes which take values located near the boundary between two modes in the mode map, the stepped tubes show maximum energy absorption efficiency. Moreover, it is found that the absorption efficiency of stepped tubes is proportional to the thickness t in about 1.8th power.
2010-09-25