新型多胞管轴向吸能特性的理论和数值研究

Theoretical and numerical studies on the axial energy absorption characteristics of novel multi-cell tubes

为改善多边形薄壁管的轴向吸能特性,设计了在其角部区域添加胞元的新型多胞管。基于简化的超折叠单元理论,提出了一种预测多胞管平均压溃力的理论模型。此外,通过数值模拟给出了多胞管在准静态轴向荷载作用下的吸能特性。研究结果表明:理论预测和数值模拟的平均相对误差为5.65%。多胞管的吸能特性随壁厚的增大而增大,随边厚比的增大而减小。在多边形管的角部区域添加胞元可显著提高结构的吸能特性。在四边形管的角部区域添加菱形胞元比添加拱形胞元的吸能特性好;在六边形管的角部区域添加拱形胞元和添加菱形胞元的吸能特性相近。四边形-菱形多胞管的吸能特性最佳。

In order to improve the axial energy absorption characteristics of polygon thin-walled tubes, novel multi-cell tubes with cells at the corner regions is designed. Based on the Simplified Super Folding Element theory, a theoretical model for predicting the mean crushing force of multi-cell tubes is proposed. In addition, the energy absorption characteristics of multi-cell tubes under quasi-static axial loading are given by numerical simulation. The results show that theoretical results agree well with numerical results. The energy absorption characteristics increases with the increase of wall thickness and decreases with the increase of width-thickness ratio. The energy absorption behaviors of polygonal tubes can be improved by adding cells at the corner regions. The energy absorption characteristics of multi-cell tubes with rhombus cells are better than that of adding arch cells at the corner regions of square tubes. The energy absorption characteristics of hexagon tubes with arch cells and rhombus cells are similar. The square-rhombus multi-cell tube has the best energy absorption characteristics.