各種ハット型断面を持つ強度部材の軸方向衝撃圧潰 : 第2報,圧潰過程のFEMシミュレーション

概要

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Axial crush behavior of strengthening structural members is numerically simulated by the use of the dynamic explicit FEM code DYNA3D. The numerical model of the structure is composed of the shell elements and the material is assumed as a mild steel or a high tensile strength steel corresponding to the performed experiment. A drop hammer composed of solid finite-elements hits the top edge of the structure at 10 m/s, keeping its lower edge embedded into the rigid base. The calculated hat-shaped cross-sections are three types of rectangles and a more complex shape with a rectangular concave portion on the hat top. The axial length of the strticture is 120〜200 mm. When the accordion type cyclic buckling mode takes place, the crush strength is high and thus the structure attains a high capacity of the energy absorption. Another mode of bending collapse around a single plastic hinge also occurs under some conditions. In this case, the structure has a low capacity of energy absorption and thus is not preferable. The calculated crush strength agrees well with the corresponding experimental result, especially for the high strength material. The crush strength is larger for the shorter hat-height, which is coincident with the experimental result. It is also well simulated numerically that a more complex shape of the cross-section leads a higher crush strength.
社団法人日本機械学会の論文
2002-02-25