强化型内凹蜂窝的力学特性研究

Based on the re-entrant hexagonal honeycomb (RHH) configurationan enhanced re-entrant honeycomb structure (ERH) was proposed by embedding the diagonal struts into its cell.Static mechanical performances of ERH were investigated by quasi-static compression testand the deformation mechanism of unit cell was revealed.Dynamic responses of ERH under low speed (10 m/s) and high speed (100 m/s) impact loads were studied by finite element simulation.The deformation modesdynamic Poisson,s ratio and energy absorption capacity were analyzed in detail.It is found that the embedment of diagonal struts into the cell can enhance the resistance of the honeycomb structure under low speed impact loads with no great influence on the negative Poisson,s ratio effect of the original structure.Compared with RHHthe energy absorbed per unit mass of ERH can be increased by 38.53% and 13.85%respectivelyunder low and high speed impact loadsindicating that the embedded diagonal struts can also improve the energy absorption capacity of the honeycomb structure.