Truss-lattice materials offer a promising alternative to dense solids due to their low weight and high specific mechanical, thermal, acoustic, and vibrational properties. While additive manufacturing technologies have accelerated the design of lattices with desirable properties, including a negative Poisson ratio, lattices with a zero Poisson ratio remain scarce, despite their unique monoclastic curvature under pure bending. These materials are highly sought after for morphing cylindrical panel applications. On the other end of the spectrum are the lattice materials with a Poisson ratio of near one, such as the perfect hexagonal lattice, which possess exceptional energy absorption capabilities. In this study, we present ten new in-plane isotropic two-dimensional lattice materials, seven of which have a Poisson ratio close to one and three of which have a Poisson ratio close to zero at low relative densities. Finite element analyses were conducted to characterize the in-plane elastic properties of the developed lattices. The Poisson ratios of all three zero Poisson ratio lattices are nearly independent of relative density. Two of these lattices undergo stretching-dominated deformation under external loads, while the third lattice experiences bending-dominated deformation. The seven lattice materials with a Poisson ratio near one are bending-dominated like the perfect hexagonal lattice. However, four of these materials possess a greater stiffness than the perfect hexagonal lattice. Overall, this study provides valuable insights into the design of truss-lattice materials with unique properties that may be useful for various applications.
Keywords: Cellular Solids, Lattice Materials, Poisson Ratio, Finite Element Method
Acknowledgements
The authors gratefully acknowledge the financial support of TÜBÝTAK (Project Title: Design of New Multi-Functional Lattice Materials; Project No: 219M296 ORCID NO: 0000-0002-2500-9306).
Anahtar Kelimeler: Cellular Solids, Lattice Materials, Poisson Ratio, Finite Element Method
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