Analysis on ohe Design and Mechanical Performance of Cellular Auxetic Structures: A Review

Abstract

Auxetic structures (also metamaterials) are those which exhibit a negative Poisson ratio (NPR) property, whereby they display the unusual property of lateral expansion in tension, as well as an equal and opposing densification when compressed. This behavior they possess has made it suitable for tailored applications in areas ranging from transportation, mechanical, medical as well as in intelligent expandable actuators. The work carried out in this paper, broadly explores and reviews various design techniques of cellular auxetic structures (planar, tubular, and arched) as well as their manufacturing techniques. Theoretical, numerical, and experimental methods have all been carried out to study the properties of these structures, these methods are discussed. Furthermore, the auxetic behavior, and mechanical properties, of these structures predominantly along their in-plane/axial direction are reviewed, although studies along the out-of-plane/lateral direction haven’t been extensively explored. Finally, some challenges and future explorable opportunities with regards to the auxetic tubes are discussed.