Comparative analysis of re-entrant honeycomb and star-shaped auxetic meta-structures: energy absorption and Poisson's ratio performance

Auxetic meta-structures, characterized by their negative Poisson's ratio, offer unique mechanical properties that enhance energy absorption and structural resilience. This study compares two distinct auxetic configurations: the re-entrant honeycomb and the star-shaped auxetic meta-structures. The investigation focuses on two critical parameters (specific energy absorption (SEA) and Poisson's ratio) to evaluate their suitability for applications requiring superior impact mitigation and deformability. Finite element analysis (FEA) was employed to determine these parameters under quasi-static loading conditions.Results indicate that while both structures exhibit auxetic behavior, the re-entrant honeycomb demonstrates higher SEA due to its efficient load distribution and densification mechanisms. Conversely, the star auxetic structure achieves a more pronounced negative Poisson's ratio, providing enhanced lateral expansion under compression. These findings highlight the trade-offs between energy absorption efficiency and auxetic performance, offering insights for designing materials tailored to specific engineering applications, such as protective gear, packaging, and biomedical devices.

کلیدواژه ها:

Re-entrant honeycomb ، Star auxetic structure ، Auxetic meta-structure ، Special energy absorption