Abstract

Energy absorption characteristics of polygonal multi-cell tubes with different cross-sectional shapes under quasi-static axial crushing are investigated systematically. Based on the SSFE theory and CE method, theoretical models for predicting mean crushing force of tubes are proposed, and theoretical expressions of normalized mean crushing force (NFm) and normalized special energy absorption (NSEA) of tubes are derived. Numerical models for predicting the energy absorption characteristics also are established using the software ABAQUS/Explicit. The results of theoretical predictions and numerical simulations about 36 design conditions are in good agreement with experimental results those obtained by previous authors. Adding inner panels can improve the energy absorption characteristics of thin-walled tubes. And adding Cross-type inner panels in S, H and O single-cell tubes has more remarkable improvement than that of adding X-type and Y-type inner panels. The NFm increases with the increase of wide-thickness ratio, and NSEA decreases with the increase of wide-thickness ratio.

摘要

系统研究了准静态轴向破碎下不同截面形状的多边形多胞管的吸能特性。基于SSFE理论和CE方法，提出了预测管材平均压溃力的理论模型，推导了管材归一化平均压溃力（NFm）和归一化特殊能量吸收（NSEA）的理论表达式。还使用 ABAQUS/Explicit 软件建立了用于预测能量吸收特性的数值模型。36种设计工况的理论预测和数值模拟结果与前人的实验结果吻合较好。添加内板可以提高薄壁管的吸能特性。并在S中加入十字型内板，H和O单格管比增加X型和Y型内板有更显着的改进。NFm随着宽厚比的增加而增加，而NSEA随着宽厚比的增加而减小。