Highly stretchable two-dimensional auxetic metamaterial sheets fabricated via direct-laser cutting

Abstract

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2D auxetic metamaterials with tuneable micro-/nanoscale apertures

“…This behaviour arises due to the fact that rather than rotating with respect to one another, the square units bend and stretch out-of-plane in a wave-like manner. This behaviour has previously been observed and reported in macroscale rotating square systems which are either extremely thin or in systems where the rotating mechanism has reached its fully-opened conformation [51]. Besides the loss of auxeticity, this type of deformation also results in the formation of irregularly-shaped apertures upon loading which are not directly oriented with the main plane in which the system is loaded.…”

“…The work conducted in this study could potentially be used as a blueprint for the design of twodimensional nano-porous reconfigurable metamaterials. Although the base design of the rotating square geometry was used in this study, previous works on macroscale auxetic systems [46,50,51] have shown that a variety of slit perforation patterns exist which may be used to design planar nanostructures based on similar deformation modes. This could potentially open up the possibility of manufacturing nanostructured metamaterials with a wide range of aperture shapes and sizes which can be reconfigured through actuation, particularly if the slit patterning is based on a metamaterial with the potential to exhibit a large negative Poisson's ratio.…”

Lightweight mechanical metamaterials designed using hierarchical truss elements

“…As one may observe from the plots in Figure 11, the small strain deformation behaviour of printing constraints), which are not sufficient to completely eliminate boundary effects. This edge effect has been previously observed in a range of other metamaterial geometries [37,40] and the discrepancy between the periodic and experimental models (as well as the non-periodic FE simulations) can be reduced by using a larger number of representative units in the latter systems.…”

Numerical and Experimental Studies on the Deformation of Missing‐Rib and Mixed Structures under Compression

“…[31,[52][53][54] The influence of the edge might be associated with constraints of the edge on the operative deformation modes, including potential shear-induced deformation. In simulation and experimental studies on the tensile behavior of tetrachiral honeycombs, [53,54] it was found that the auxeticity of the system decreases upon increasing the number of repeating units in the system. This behavior was found to be associated with the tendency of the tetrachiral systems to undergo shear deformation upon uniaxial loading, which is blocked by the edge effects at the regions where the geometry is being fixed.…”

“…MR auxetic structures have attracted many research attentions recently. [34,[48][49][50][51][52][53][54][55] Many of the applications are intended for application under in-plane compression loads, and it is important to establish a detailed understanding on the deformation process, in particular, the contact between the edges and cell walls at high strains for normal MR and MSs, which are directly relevant to the mechanical behaviors and the stability of the cell and overall sample deformation. MSs could offer opportunities to further enhance the freedom in structures design.…”