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AbstractA novel square hierarchical structure axially varying thickness (SHSAVT) structure, drawing inspiration from origami, has been introduced. And a systematic numerical analysis has been conducted to assess the crashworthiness of this innovative structure when subjected to axial impacts. The findings of the crashworthiness analysis demonstrate that SHSAVT structures with k values greater than zero exhibit a remarkable capacity for energy absorption (EA) while maintaining the same mass, and they notably reduce the initial peak crushing force (IPCF). Additionally, it was observed that as the hierarchy level increases, the action force experiences less fluctuation, resulting in increased EA, thus enhancing the overall crashworthiness of the structure while reducing IPCF. Moreover, when compared to structures with the same wall thickness, SHSAVT with k values greater than zero demonstrated a substantial 54.46% decrease in maximum IPCF and a significant 112.27% increase in maximum crushing force efficiency (CFE). Furthermore, higher k values correlated with lower IPCF and higher CFE, SHSAVT with k values greater than zero as superior in terms of IPCF and CFE performance. [ABSTRACT FROM AUTHOR]

AbstractThis study systematically investigated the effect of position evolvement of four ribs in multicellular square tube on its crashworthiness performance. Results show that the multicellular square tubes with the shape factors of k = 0.25 and k = 0.75 have better energy absorption performances than other multicellular square tubes under the same wall thickness or the same mass. The mean crush force is derived through the simplified super folding element theory. Moreover, multi-objective optimization of multicellular square tube is carried out and the optimal result is validated by the finite element model. [ABSTRACT FROM AUTHOR]