Numerical Investigation of Impact Behavior of Strut-Based Cellular Structures Designed by Spatial Voronoi Tessellation

Abstract

Porous materials have significant advantages, such as their light weight and good specific energy absorption. This paper presents the designs of two ordered Voronoi structures, a truncated octahedron (Octa) and a rhombic dodecahedron (Dodeca), based on spatial Voronoi tessellation. Through a numerical analysis, the dynamic behavior, deformation and energy absorption of the two porous structures under different impact energies were explored. According to the energy-absorption index, the effects of porosity, rotating unit cell and unit-cell shape on the energy absorption of the porous structures were quantitatively evaluated. The study shows that, for Dodeca and Octa structures subjected to various impact energies, the force-displacement curves exhibit three modes. The porosity, rotational unit cell and unit-cell shape play a crucial role in affecting the impact resistance of porous structures. The work in this paper proposes an effective way to improve the energy-absorption capacity of porous structures under different impact energies. At the same time, a new understanding of the deformation mechanism of Octa and Dodeca was obtained, which is significant for the impact-resistance design and energy-absorption evaluation of porous structures.

Mechanical performance of carbon fiber‐reinforced polymer cellular structures manufactured via fused filament fabrication

“…This is mainly due to the irregular structure of Voronoi that results in disordered deformation and earlier densification. It should be noted that the performance of the Voronoi structure highly depends on the design parameters; a recent study on the impact absorbance behavior of cellular structures designed by spatial Voronoi tessellation provided specific energy absorption capacities reaching 10 kJ/kg at relative densities as low as 10% 55 …”

“…It should be noted that the performance of the Voronoi structure highly depends on the design parameters; a recent study on the impact absorbance behavior of cellular structures designed by spatial Voronoi tessellation provided specific energy absorption capacities reaching 10 kJ/kg at relative densities as low as 10%. 55 Lastly, the strain recovery during unloading is a parameter that deserves a discussion. The PA specimens recover a significant portion of their size upon unloading, as the compression does not induce total fracture.…”

Elastic Properties of Open Cell Metallic Foams—Modeling of Pore Size Variation Effect

“…Open-cell metallic materials exhibit interesting conjunction of structural and functional properties. Because of porous, lightweight structure (reduced relative density), their mechanical (specific strength, i.e., strength related to density) [ 1 , 2 ], thermal (conductivity) [ 3 , 4 ], or flow (permeability, pressure drop) [ 5 , 6 ] properties may be tuned by the relative density and structural homogeneity. To date, a long list of applications of cellular materials has been extensively reported.…”