Effect of Aspect Ratio, Rotation, and Eccentricity of Square Section Nested Thin-Walled Tubes on Their Energy Absorption Characteristics Under Quasi-Static Load

In this research, energy absorption characteristics of nested thin-walled aluminum structures with square cross-section have been investigated, and the effect of the three parameters: eccentricity, rotation, and tube aspect ratio on the energy absorption characteristics of the structure has been studied. The properties investigated were the specific energy absorption and crush force efficiency. An aluminum 1050 sheet was used to build the tubes. After making the samples and determining how the tubes were placed with each other, the structures were subjected to quasi-static axial loading. Also, for parametric investigations, the behavior of the structures was simulated using LS-Dyna software. The results showed that the simultaneous effect of the three desired parameters has increased the specific absorbed energy and the crushing force efficiency. When the tubes were at maximum eccentricity, the specific energy absorption and crushing force efficiency increased by reducing the aspect ratio and rotation angle. On average, the best sample’s specific energy absorption and crush force efficiency increased by 41.9% and 22.2%, respectively, compared to the single tube.