Crashworthiness Study of Double‐Hexagonal Self‐Similar Hierarchical Multicellular Tubes

The energy absorption of the hierarchical multicell design is also better than that of the traditional multicell tube, and in addition, the energy absorption of the double‐tube structure is better than that of the single‐tube structure. Based on the above findings, a double‐hexagonal self‐similar hierarchical multicellular structure is proposed, and its crashworthiness analysis with the same wall thickness is carried out by numerical simulation of the validated model. The findings demonstrate that the double‐hexagonal self‐similar hierarchical multicellular tube (DHSHMT) exhibits superior energy absorption compared to the traditional hexagonal multicellular tube (THMT). Specifically, the DHSHMT‐3 demonstrates a 311.12% increase in energy absorption, a 65.82% increase in specific energy absorption, and a 67.61% increase in crush force efficiency when compared to the THMT. Furthermore, the parametric analysis reveals that the crashworthiness of the double‐hexagonal self‐similar hierarchical multicellular tube is significantly influenced by the wall thickness. Additionally, the crashworthiness is also affected by the gradient of the wall thickness (k) and the ratio of the inner and outer edge lengths (δ). Depending on the specific application, the wall thickness gradient and edge length ratio can be adjusted accordingly to enhance the crashworthiness of the structure.