A bi-factorial hierarchical honeycomb with promising crushing resistance

Abstract

A bi-factorial hierarchical strategy is proposed to obtain a superior crushing resistance by optimizing the network section of honeycomb materials. A novel honeycomb named bi-factorial hierarchical honeycomb (BFHH) is developed, and its promising energy dissipation mechanism and progressive folding deformation are revealed by a compressive experiment. In the crashworthiness comparison, the material utilization and the crushing load efficiency of the BHFF-c16-h2 are superior to those of honeycombs with other hierarchical types with the same mass. Furthermore, a crashworthiness design on the bi-factorial hierarchical honeycomb is conducted to explore the effect of geometric parameters on crushing resistance. The increasing hierarchical factor h can improve the energy dissipation mechanism of the BFHH. The thickness-length ratio t/l can determine the deformation mode of the BFHH, which further controls the crushing loading efficiency of the BFHH. In addition, a dynamic matching strategy for the effective crushing distance coefficient is proposed to optimize the accuracy of theoretical analysis. The error of theoretical derivation is controlled to within 7%. Research findings can provide a guiding significance for the crashworthiness design of honeycomb materials.