关键词: 周期开孔, 圆管, 轴向加载, 准静态, 吸能

Abstract: By combining the compressibility of the multi-cell material and the axisymmetry of the circular tube, a new energy absorption structure of circular tube with periodic holes was proposed. The mechanical properties of the structure under axial quasi-static loading were studied by numerical simulation. The specimens of typical dimensions were processed and quasi-static experiments were carried out. The experiment proved the reliability of the numerical simulation. The numerical simulation and the experiment show that under the quasi-static axial compression, the main deformation mode of the structure is the overall axial uniform compression, the load displacement curve is smooth, the load force is stable and the amplitude is large, the specific energy absorption and stroke efficiency are moderate, and the cushioning energy absorption performance is good. The influence of geometric parameters on the energy absorption performance of the structure was discussed. It is found that the thickness of the circular tube decides the magnitude of the mean force, and the relationship between them is linear; with the increase of the number of periodic openings or cell wall thickness, the mean force increases gradually, the stroke efficiency decreases gradually, and the specific energy absorption changes little.

Key words: periodic opening, circular tube, axial loading, quasi-static, energy absorption