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<p>Auxetic materials exhibit negative Poisson’s ratio, leading to enhanced energy absorption and mechanical stability. In the present study, three distinct hybrid auxetic structures such as ST (Star Triangle), STM-1 (Star Triangle Meta-Chiral 1), and STM-2 (Star Triangle Meta-Chiral 2) have been designed and fabricated using Polylactic Acid (PLA) by additive manufacturing process. The numerical simulations and experimental studies have been carried out to understand the behavior under compressive loading. The deformation patterns, force-displacement responses and failure mechanisms of the structures were analyzed to understand their structural performance. The results showed that the developed structures possessed auxetic behavior, characterized by lateral inward movement under compression. The experimental validation revealed close agreement with the simulated results of the compression behavior. Among these structures, STM-2 was found to have the highest specific energy absorption value of 2.128&#xa0;kJ/kg followed by STM-1 and ST with 1.455&#xa0;kJ/kg and 0.904&#xa0;kJ/kg, respectively. Furthermore, three-point bending test results showed that STM-2 offers the highest energy absorption capacity of 18,452&#xa0;N·mm while ST has lowest energy absorption value of 10,955&#xa0;N·mm. In a nutshell, the present study highlights the influence of structural design on mechanical performance of auxetic structures further indicating that the chiral features exhibit superior mechanical stability. Besides this, the findings suggested suitability of STM-2 for energy absorption and impact-resistant applications in biomedical, automobile, and military fields.</p> Graphical abstract <p></p>

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In-plane compression and bending performance of additively manufactured hybrid auxetic structures for energy absorption applications

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Saminderpreet Singh,
  • Parv Bangar,
  • Varun Sharma

摘要

Auxetic materials exhibit negative Poisson’s ratio, leading to enhanced energy absorption and mechanical stability. In the present study, three distinct hybrid auxetic structures such as ST (Star Triangle), STM-1 (Star Triangle Meta-Chiral 1), and STM-2 (Star Triangle Meta-Chiral 2) have been designed and fabricated using Polylactic Acid (PLA) by additive manufacturing process. The numerical simulations and experimental studies have been carried out to understand the behavior under compressive loading. The deformation patterns, force-displacement responses and failure mechanisms of the structures were analyzed to understand their structural performance. The results showed that the developed structures possessed auxetic behavior, characterized by lateral inward movement under compression. The experimental validation revealed close agreement with the simulated results of the compression behavior. Among these structures, STM-2 was found to have the highest specific energy absorption value of 2.128 kJ/kg followed by STM-1 and ST with 1.455 kJ/kg and 0.904 kJ/kg, respectively. Furthermore, three-point bending test results showed that STM-2 offers the highest energy absorption capacity of 18,452 N·mm while ST has lowest energy absorption value of 10,955 N·mm. In a nutshell, the present study highlights the influence of structural design on mechanical performance of auxetic structures further indicating that the chiral features exhibit superior mechanical stability. Besides this, the findings suggested suitability of STM-2 for energy absorption and impact-resistant applications in biomedical, automobile, and military fields.

Graphical abstract