In-Plane Dynamic Crushing Response of Re-Entrant Trichiral Honeycomb

To improve the in-plane impact resistance of trichiral structures, a re-entrant trichiral structure (RTH) was constructed by adding re-entrant structure into trichiral honeycomb (TH). The deformation modes, energy-absorbing capacity, and auxetic performances of RTH under different impact velocities were studied by using the commercial software LS-dyna. The results show that re-entrant structure can enhance the localized “necking” deformation of TH under medium- and low-velocity impact, and a “\” -shape deformation mode appears during the entire collapse process. Furthermore, it is found that the stress-strain curves can be divided into two stages: the plateau region and stress increasing region. The plateau strain ε_p and densification strain ε_d are gradually increased with crushing velocity. Compared with the TH, the specific energy absorption of RTH is 61.16% higher under low-velocity impact and 58.9% higher under medium-velocity impact. This study provides a novel path for the design of hybrid deformation mechanism auxetic honeycombs.