Journal
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
Volume 23, Issue 8, Pages 4218-4251Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/1099636221994140
Keywords
Hierarchical honeycombs; joint-based; plateau stress; energy absorption; in-plane crushing
Categories
Funding
- Natural Science Foundation of Hebei Province of China [A2020502005]
- Fundamental Research Funds for the Central Universities [2020MS113]
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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.
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.
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