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<p>Metamaterials are engineered materials with architected microstructures that impart unique mechanical properties not commonly found in nature. Among these, auxetic metamaterials, characterized by a negative Poisson’s ratio, have garnered considerable attention due to their superior energy absorption and deformation mechanisms. This research introduces the development of innovative hybrid metamaterial structures, starting with a negative Poisson’s ratio Star Lattice, which is then combined with three individual lattice designs, including the Chevron Lattice (Zero), the Honeycomb Lattice (Positive), and the Bowtie Array Lattice (Negative), to create unique combined structures. These were fabricated using three-dimensional printing (3D printing) and evaluated through experimental testing and finite element modeling (FEM). Results show that the Star–Chevron (SC) hybrid outperforms other configurations, achieving the highest energy absorption 0.636 × 10<sup>6</sup> J/m<sup>3</sup> experimentally and 0.500 × 10<sup>6</sup> J/m<sup>3</sup> in FEM, and a specific energy absorption of 641.8&#xa0;J/kg, representing nearly a 150% improvement compared to the Bowtie hybrid 0.262 × 10<sup>6</sup> J/m<sup>3</sup>. Poisson’s ratio measurements revealed that the SC lattice maintained a stable negative value of around − 0.4 up to 35% strain, ensuring uniform stress distribution and delayed densification. Furthermore, parametric studies showed that optimizing wall thickness from 1.6&#xa0;mm to 2.0&#xa0;mm enhanced energy absorption by over 20%, from 0.636 to 0.780 × 10<sup>6</sup> J/m<sup>3</sup>. These findings provide valuable insights into tailoring unit-cell arrangements in hybrid cellular structures for lightweight, high-performance energy-absorbing applications.</p>

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Mechanical evaluation of bio-inspired meta-structures: insights from experimental and computational analysis

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Majid Mohammadhosseinzadeh,
  • Masoud Shirzad,
  • Parviz Kahhal,
  • Dong Hwa Kwak,
  • Hossein Ghorbani-Menghari

摘要

Metamaterials are engineered materials with architected microstructures that impart unique mechanical properties not commonly found in nature. Among these, auxetic metamaterials, characterized by a negative Poisson’s ratio, have garnered considerable attention due to their superior energy absorption and deformation mechanisms. This research introduces the development of innovative hybrid metamaterial structures, starting with a negative Poisson’s ratio Star Lattice, which is then combined with three individual lattice designs, including the Chevron Lattice (Zero), the Honeycomb Lattice (Positive), and the Bowtie Array Lattice (Negative), to create unique combined structures. These were fabricated using three-dimensional printing (3D printing) and evaluated through experimental testing and finite element modeling (FEM). Results show that the Star–Chevron (SC) hybrid outperforms other configurations, achieving the highest energy absorption 0.636 × 106 J/m3 experimentally and 0.500 × 106 J/m3 in FEM, and a specific energy absorption of 641.8 J/kg, representing nearly a 150% improvement compared to the Bowtie hybrid 0.262 × 106 J/m3. Poisson’s ratio measurements revealed that the SC lattice maintained a stable negative value of around − 0.4 up to 35% strain, ensuring uniform stress distribution and delayed densification. Furthermore, parametric studies showed that optimizing wall thickness from 1.6 mm to 2.0 mm enhanced energy absorption by over 20%, from 0.636 to 0.780 × 106 J/m3. These findings provide valuable insights into tailoring unit-cell arrangements in hybrid cellular structures for lightweight, high-performance energy-absorbing applications.