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

Abstract

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.

Nonlinear analysis model of the progressive damage of aluminum–wood sandwich structures under high-speed impact conditions

“…On a microscopic level, wood has a honeycomb structure. 10 Microbuckling of the tracheid (cell wall) occurs during longitudinal compression and this mechanism can be compared with the macroscopic buckling that occurs in square metal tube structures.…”

“…Therefore, the design of multilayer core sandwich structures becomes important and these designs require continuous improvement. In recent years, researchers have studied various forms of layered structures, including layered honeycomb structures [9][10][11] and layered composite honeycomb sandwich cylindrical structures, 12 by using multiple layers and structures in their structural designs. 13 Additionally, Noor et al 14 analyzed the nonlinear responses of composite sandwich plates under thermal gradients and mechanical loading conditions.…”

High-velocity impact performance of sandwich panels with additively manufactured hierarchical honeycomb cores: An experimental and numerical study

“…2 With their cellular geometry and lightweight composition, honeycomb structures offer an impressive strength-to-weight ratio, demonstrating substantial resistance to high-velocity impacts and intense pressure. 3,4 Honeycomb sandwich panels, renowned for superior shock mitigation and energy absorption, have been extensively researched. [1][2][3][4][5] Recent advancements in numerical and experimental impact loading techniques have prompted interest in their dynamic behavior.…”

“…3,4 Honeycomb sandwich panels, renowned for superior shock mitigation and energy absorption, have been extensively researched. [1][2][3][4][5] Recent advancements in numerical and experimental impact loading techniques have prompted interest in their dynamic behavior. Studies have primarily delved into the compressive behavior and lowvelocity impact response, [6][7][8][9] emphasizing geometric parameters like core height, cell wall thickness, and striking sheet thickness.…”

“…2 With their cellular geometry and lightweight composition, honeycomb structures offer an impressive strength-to-weight ratio, demonstrating substantial resistance to high-velocity impacts and intense pressure. 3,4…”