The resistance of auxetic metamaterial samples to normal penetration by a rigid spherical impactor was experimentally investigated. The samples were made on a 3D printer from thermoplastic polyurethane (TPU 95A plastic) based on a cell in the form of a concave hexagon, which has a negative Poisson’s ratio. The internal structure of the manufactured samples differed in the angle of rotation (0, 30, 45, 60 or 90 degrees) relative to the vertical axis. The samples were compared in terms of their ability to reduce the kinetic energy of the impactors at a velocity of about 190 m/s at temperatures of 5, 16, 25, and 35◦С. It was found that in the considered temperature range, the samples most effectively resist penetration by an impactor at 25◦C. At the same time, for all temperatures, the greatest resistance is characteristic of auxetic metamaterials made of thermoplastic polyurethane, with a 90-degree unfolded structure.

Svetlana Yu. Ivanova, Cand. Sci. Phys. & Math., Leading Researcher, Ishlinsky Institute for Problems in Mechanics RAS;

https://orcid.org/0000-0001-5096-2759; AuthorID: 146039

Kirill Yu. Osipenko, Cand. Sci. Phys. & Math., Senior Researcher, Ishlinsky Institute for Problems in Mechanics RAS; https://orcid.org/0000-0001-9653-1831; AuthorID: 16440

Alexander I. Demin, Engineer, Ishlinsky Institute for Problems in Mechanics RAS; e-mail: deminaliv@gmail.com; AuthorID: 226717

Nikolay V. Banichuk, Dr. Sci. Phys. & Math., Professor, Chief Scientific Researcher, Ishlinsky Institute for Problems in Mechanics RAS; https://orcid.org/0000-0002-0652-0934; AuthorID: 8002

Dmitry S. Lisovenko, Corresponding member RAS, Dr. Sci. Phys. & Math., Head of Laboratory, Ishlinsky Institute for Problems in Mechanics RAS; e-mail: lisovenk@ipmnet.ru; https://orcid.org/0000-0003-0485-3433; AuthorID: 167930