New zero Poisson's ratio models

TL;DR

This paper introduces a simple 2D topological model for near-zero Poisson's ratio structures, demonstrating experimental results close to zero and potential for extension to 3D systems, offering new design possibilities.

Contribution

A novel, straightforward 2D topological model for near-zero Poisson's ratio structures that is not based on traditional re-entrant or honeycomb configurations.

Findings

Experimental PR of -0.003 ± 0.001 close to zero

Model is easily extendable to 3D systems

Addresses advantages and disadvantages of the model

Abstract

Most materials exhibit positive Poisson's ratio (PR) values but special structures can also present negative and, even rarer, zero (or close to zero) PR. Null PR structures have received much attention due to their unusual properties and potential applications in different fields, such as aeronautics and bio-engineering. Here, we present a new and simple near-zero PR 2D topological model based on a structural block composed of two smooth and rigid bars connected by a soft membrane or spring. It is not based on re-entrant or honeycomb-like configurations, which have been the basis of many null or quasi-null PR models. Our topological model was 3D printed and the experimentally obtained PR was$-0.003\,\pm 0.001\,$, which is one the closest to zero value ever reported. This topological model can be easily extended to 3D systems and with compression in any direction. The advantages and disadvantages of these models are also addressed.