A 3D Mechanism-driven Hexagonal Metamaterial: Evaluation of Auxetic Behavior

Auxetics and FEA: Modern Materials Driven by Modern Simulation Methods

“…investigated a 3D-printable auxetic metamaterial operating through a sliding mechanism (Figure 5h). Their experimental and FEA simulations produced coherent results, and the proposed structure was claimed to exhibit superior performance to the 3D re-entrant honeycomb, due to higher compression resistance and more stable auxetic behaviour [199].…”

“…investigated a 3D-printable auxetic metamaterial operating through a sliding mechanism (Figure 5h). Their experimental and FEA simulations produced coherent results, and the proposed structure was claimed to exhibit superior performance to the 3D re-entrant honeycomb, due to higher compression resistance and more stable auxetic behaviour [199]. [192]; (d) the 3D chiral cellular structure as proposed and studied by Farrugia, Gatt and Grima, 2019 [193]; (e) a 3D cellular system as studied by Wang et al, 2020, which can be seen as a 3D render on the "rotating squares" [194]; (f) a 3D cellular structure proposed, modelled and tested experimentally by Photiou et al, 2021 [196]; (g) a mechanical version of a crystalline system modelled by Grima Cornish et al 2022, [197]; and (h) a sliding system investigated by Su et.…”

Heuristic molecular modelling of quasi-isotropic auxetic metamaterials under large deformations

“…This characteristic is retrieved by the complex kinematics that occurs at a material elementary level [28]. In the literature, several micro-structures have been investigated [33], such as re-entrant shapes [34][35][36], rotating rigid and semi-rigid polygons [37], crystals [38,39], chiral structures [40,41], truss or beam-based lattices [7][8][9]11], and foams [29]. These studies are fundamental since allow to understand the importance of including both shape and orientation when modelling the material at finer scales, but also the need of incorporating the rotational degree of freedom and the effect of geometric non-linearities.…”

A Tunable Metamaterial Joint for Mechanical Shock Applications Inspired by Carbon Nanotubes

“…The hexagonal atomistic structure of graphene and carbon nanotubes (CNTs), due to its strength and deformation abilities, has attracted interest for applications not only at the nanoscale but at the microscale as well. The idea of imitating the structural characteristics of nanomaterials in larger components via the introduction of relevant metamaterials with hexagonal or honeycomb lattice patterns [11,12] seems to produce impressive results in demanding engineering fields such as automotive and aerospace engineering. Discrete design schemes in metamaterials may provide a variety of enhanced properties such as high strength, stiffness, and fracture toughness, and light weight [13].…”