Exploring the impact of computationally generated auxetic metamaterials in additive manufacturing: a systematic review of design, materials and applications

Auxetic metamaterials are a group of lattice structures with a Negative Poisson Ratio (NPR), which behave
like an elastic material under the application of tensile and compressive forces. These engineered metamaterials
have several applications in various engineering domains, including medical, biomedical, aerospace,
electronics, and mechanical engineering. This presents a detailed literature study on the algorithms used for
creating the lattices, lattice structure design, mechanical properties, manufacturing techniques, and deformation
mechanisms, which are essential for developing novel metamaterials. The work also suggests the selection of
computationally optimized metamaterials, considering the right material, mechanical, and thermal behaviour of
the metamaterials for those applications. Most of the conventional manufacturing methods for producing lattice
structures with NPR have several drawbacks, such as tool accessibility, material selection and load-bearing
capabilities of the work material. The practical use of those lattice structures can be done by part fabrication
with various Additive Manufacturing (AM) processes, where the chirality and rigidity of these lattice structures
are essential to meet the exact part requirements. This paper provides the details about the metamaterials in
terms of their characteristics, types, algorithms, applications and potential advancements. This review article
will serve as a quick start for novices planning to work on the development of Auxetic Metamaterials.