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<p>This study investigates tubular auxetic energy absorbers subjected to both axial and lateral loading. Two types of auxetic configurations, namely re-entrant and anti-chiral structures, were examined alongside a simple cylindrical absorber serving as a baseline model. Additionally, a hexagonal energy absorber was considered to evaluate the effects of volume distribution and overall structural response relative to the simple cylinder. All auxetic and hexagonal structures were initially optimized using a multi-objective framework based on the genetic algorithm, considering both axial and lateral loading scenarios. Specific energy absorption (SEA) was employed as the primary evaluation criterion during the optimization process. Comparative analysis revealed that, relative to the hexagonal baseline, the re-entrant and anti-chiral structures enhanced SEA by factors of 2.89 and 2.45 under axial loading, and by 3.7 and 2.65 under lateral loading, respectively. These significant improvements are attributed to the negative Poisson’s ratio inherent in the auxetic structures, which, in combination with their distinct deformation mechanisms, promotes more efficient energy dissipation.</p>

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Advanced Design of Tubular Auxetic Metamaterials for Multifunctional Energy Absorption

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • Alireza Sangsefidi,
  • Seied Ahmad Hosseini

摘要

This study investigates tubular auxetic energy absorbers subjected to both axial and lateral loading. Two types of auxetic configurations, namely re-entrant and anti-chiral structures, were examined alongside a simple cylindrical absorber serving as a baseline model. Additionally, a hexagonal energy absorber was considered to evaluate the effects of volume distribution and overall structural response relative to the simple cylinder. All auxetic and hexagonal structures were initially optimized using a multi-objective framework based on the genetic algorithm, considering both axial and lateral loading scenarios. Specific energy absorption (SEA) was employed as the primary evaluation criterion during the optimization process. Comparative analysis revealed that, relative to the hexagonal baseline, the re-entrant and anti-chiral structures enhanced SEA by factors of 2.89 and 2.45 under axial loading, and by 3.7 and 2.65 under lateral loading, respectively. These significant improvements are attributed to the negative Poisson’s ratio inherent in the auxetic structures, which, in combination with their distinct deformation mechanisms, promotes more efficient energy dissipation.