In-plane compressive properties of assembled auxetic chiral honeycomb composed of slotted wave plate

Auxetic metamaterials tend to be fabricated using additive manufacturing and laser cutting due to their special porous microstructures. Although the auxetic metamaterials have many applications currently, the high cost and the low efficiency of available manufacturing are adverse to expend their application range. In this work, the auxetic chiral honeycomb is assembled crosswise using the slotted wave plate. Effects of wave radius, plate thickness, slot percentage, and base material on the Poisson's ratio and mechanical performance are explored experimentally and numerically. The results show that assembled auxetic chiral honeycomb (AACH) exhibits lower peak force and high plateau stress than the conventional assembled one. With the increase of wave radius and plate thickness, the energy absorption (EA) and specific energy absorption (SEA) would increase. As for the different material combinations, when the base materials in vertical and horizontal wave plates adopt stainless steel and aluminum, respectively, the AACH would exhibit desirable EA, SEA, and auxetic behavior. These findings provide a new approach to the manufacture of auxetics at a low cost, which is beneficial for potential applications.(c) 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

This study investigates the effects of wave radius, plate thickness, slot percentage, and base material on the mechanical performance of crosswise assembled auxetic chiral honeycombs. The results show that the assembled auxetic chiral honeycombs exhibit lower peak force and high plateau stress compared to the conventional assembled ones. Increasing the wave radius and plate thickness improves energy absorption and specific energy absorption. When the base materials of the vertical and horizontal wave plates are stainless steel and aluminum, respectively, the assembled auxetic chiral honeycombs demonstrate desirable energy absorption, specific energy absorption, and auxetic behavior.