In-plane dynamic crushing behaviors of joint-based hierarchical honeycombs with different topologies

Introducing the hierarchy into cellular materials has attracted increasing attention in the effort to pursue improved absorbed-energy abilities and impact resistance. In this paper, the dynamic crushing properties and energy absorption capacities of joint-based hierarchical honeycombs with different topologies were explored by means of explicit dynamic finite element (FE) analysis using ANSYS/LS-DYNA. Four types of joint-based hierarchical honeycombs with uniform cell-wall thickness were firstly constructed by substituting each vertex of regular honeycombs with a smaller self-similar cell (hexagon or square). The respective influences of hierarchical parameters and impact velocities on in-plane dynamic deformation modes, mechanical characteristic and energy absorption of joint-based hierarchical honeycombs were discussed. Research results showed that the hierarchy had a far greater influence on the in-plane deformation modes of honeycombs. Compared with regular honeycombs, the dynamic plateau stress and specific energy absorption of joint-based hierarchical honeycombs can be improved if the proper hierarchical parameters were chosen. Adding the joint-based hierarchy into regular honeycombs can enhance the crushing stress efficiency (CSE) of the specimens. In addition, by introducing a non-dimensional dynamic sensitivity index, the dynamic shock enhancement of hierarchical honeycombs was also investigated. These researches are useful for the multi-objective dynamic optimization design and controllable properties of cellular materials.

Automated summary

This paper investigates the dynamic crushing properties and energy absorption capacities of joint-based hierarchical honeycombs with different topologies, demonstrating that hierarchy has a significant influence on the deformation modes of honeycombs. By choosing proper hierarchical parameters, the dynamic plateau stress and specific energy absorption of joint-based hierarchical honeycombs can be improved, leading to enhanced crushing stress efficiency of the specimens. Additionally, the introduction of a non-dimensional dynamic sensitivity index allows for the investigation of dynamic shock enhancement in hierarchical honeycombs, providing valuable insights for the dynamic optimization design and controllable properties of cellular materials.