On the Effect of the Mode of Connection between the Node and the Ligaments in Anti‐Tetrachiral Systems

Abstract

Chiral systems may exhibit auxetic behavior, i.e. they may have a negative Poisson's ratio. This particular property has led to their being studied extensively by several authors. A Finite Elements Study is presented here, investigating the mode of connection between the nodes and ligaments in the anti‐tetrachiral structure. The results show that the amount of gluing material used to attach the ligaments to the node will not affect the Poisson's ratio, but may have a large influence on the observed stiffness of the structure (Young's modulus). It is also shown that the stiffness of the glue will have a large effect on the mode of deformation of the chiral system. This change in mechanism was found to effect the stiffness of the structure but not its Poisson's ratios.

Anti-Tetrachiral Auxetic Structures Fabricated by Material Extrusion: Numerical and Experimental Investigation on Mechanical Properties Under Compressive Loading

“…Thus, a higher load is required to rotate the nodes. This improves compressive strength of the structure [33]. Similar results are reported in the literature [34] for theoretical and numerical modelling of anti-tetrachiral structure under compressive loading.…”

A comparison between rotating squares and anti-tetrachiral systems: Influence of ligaments on the multi-axial mechanical response

“…The mechanical properties (both Poisson’s ratio and Young’s modulus) obtained for on-axis loading (Orientation = 0°) are congruent with those obtained from previous analytical, numerical and experimental studies on rotating square and anti-tetrachiral honeycombs. 18,23,35,36,41–43,49,50…”

Analysis of the Deformation Behavior and Mechanical Properties of Slit‐Perforated Auxetic Metamaterials

“…In the case of Type II structures, an analysis of the results obtained is more straightforward, with all systems roughly mimicking the anti‐tetrachiral deformation mechanism. This is particularly evident in systems where the two sets of “I”‐shaped perforations are equally sized, with these systems exhibiting a Poisson's ratio of −1 when stretched in both the x ‐ and y ‐directions, a hallmark feature of the regular anti‐tetrachiral honeycomb which these systems resemble.…”