Energy absorption of the additively manufactured novel re-entrant auxetic structure in comparison with honeycomb structure: experimental and numerical analysis

The energy absorption and negative Poisson's ratio (NPR) of a novel re-entrant auxetic structure were examined under quasi-static compression loading in this study, along with their comparison to a non-auxetic honeycomb utilizing experimental study and numerical analysis. The specimens were made using additive manufacturing (3D printing). The results show that auxetic structures' energy absorbed at least 57.75% better than non-auxetic honeycombs. In addition, NPR behavior and energy absorption are affected by the geometrical characteristics of the unit cell as well as the material of the re-entrant auxetic structure. According to the results, the Poisson's ratio got more negative, and the auxetic property increased when the oblique length and initial characteristic angle were raised. In contrast with these two characteristics, Poisson's ratio rises as structure thickness increases while the auxetic property decreases.