Abstract:A re-entrant anti-trichiral honeycomb(RATH) was designed by combining the re-entrant honeycomb and the anti-chiral honeycomb(ATH).The deformation modes, impact resistance, and auxetic performances of RATH with different impact velocities and relative densities were studied by using the dynamic explicit simulation software LS-DYNA.The results show that introducing the re-entrant structure can enhance the localized “necking” phenomenon of ATH under medium- and low-velocity impact and that a V-shaped deformation band appears near the impact end of RATH.Compared with the ATH and conventional honeycomb, the RATH has better energy absorption capacity and negative Poisson’s ratio effect.The empirical formulas for critical impact velocity and plateau stress were deduced based on the 1D shock theory and numerical simulation.In addition, the effects of the cell-wall thicknesses and crushing velocity on the plateau stress and plateau strain were systematically explored.This study is expected to provide a novel path for design of auxetic honeycombs with hybrid deformation mechanism.
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