| Issue |
EPL
Volume 123, Number 1, July 2018
|
|
|---|---|---|
| Article Number | 16002 | |
| Number of page(s) | 4 | |
| Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
| DOI | https://doi.org/10.1209/0295-5075/123/16002 | |
| Published online | 01 August 2018 | |
Mechanical properties of 2D hierarchical re-entrant cellular structures with Voronoi sub-structures
1 College of Sciences, Northeastern University - Shenyang 110819, PRC
2 Materials Science and Engineering, University of Virginia - Charlottesville, VA 22904, USA
Received: 30 March 2018
Accepted: 11 July 2018
In this study, 2D hierarchical re-entrant cellular structures with Voronoi sub-structures were proposed. Their Poisson's ratios and energy absorption capacities (in-plane) were studied using the finite-element method. The effects of geometric parameters (Voronoi sub-structure irregularity, k, concave angle, θ, ratio of cell wall thickness to cell height, w) on the lattice mechanical properties were investigated. Results showed that Poisson's ratio first decreased and then increased with an increasing θ when k is less than 0.5. A minimum Poisson's ratio of approximately −0.315 was achieved when 
and 
. The 2D hierarchical re-entrant lattice structure exhibited a maximum energy absorption capacity when 
and 
, which is 3.9 times higher than that of the traditional re-entrant structure with solid ribs and of identical relative density.
PACS: 62.20.dj – Poisson's ratio / 61.43.Bn – Structural modeling: serial-addition models, computer simulation / 61.43.Gt – Powders, porous materials
© EPLA, 2018
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