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<p>Nature-inspired structures provide optimised designs that effectively balance significant energy absorption with lightweight features, making them highly suitable for crashworthiness applications. Their structured geometries facilitate controlled deformation and better impact resistance, thereby improving safety in automotive vehicles. The present study introduces novel nature-inspired hierarchical hexagonal tubes aimed at improving deformation behavior and energy absorption capabilities. The proposed thermoplastic composite tubes were fabricated using the 3D printing technique, which allows for precise control over both the design and the material properties. In order to determine the crashworthiness characteristics of the hierarchical hexagonal tube configurations, experimental testing was carried out subjected to quasi-static axial loads. The findings showed that the PG-HH6 tube exhibited superior crashworthiness characteristics highlighting stable, progressive folding with high mean crushing force of 8.31 kN, and the highest specific energy absorption capacity of 8.31&#xa0;kJ/g. In this study, an extensive framework for the design of high-performance lightweight protective energy absorbers is presented. The framework&#xa0;utilize ideas inspired by nature and hierarchical designs in order to improve energy absorption capacities. </p> Graphical abstract <p></p>

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Experimental investigation of biomimetic 3D-printed hierarchical hexagonal tubes for enhanced energy absorption

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • A. Praveen Kumar,
  • K. Giridharan,
  • Santosh Kumar Sahu,
  • K. G. Ashok,
  • S. Sathiyamurthy

摘要

Nature-inspired structures provide optimised designs that effectively balance significant energy absorption with lightweight features, making them highly suitable for crashworthiness applications. Their structured geometries facilitate controlled deformation and better impact resistance, thereby improving safety in automotive vehicles. The present study introduces novel nature-inspired hierarchical hexagonal tubes aimed at improving deformation behavior and energy absorption capabilities. The proposed thermoplastic composite tubes were fabricated using the 3D printing technique, which allows for precise control over both the design and the material properties. In order to determine the crashworthiness characteristics of the hierarchical hexagonal tube configurations, experimental testing was carried out subjected to quasi-static axial loads. The findings showed that the PG-HH6 tube exhibited superior crashworthiness characteristics highlighting stable, progressive folding with high mean crushing force of 8.31 kN, and the highest specific energy absorption capacity of 8.31 kJ/g. In this study, an extensive framework for the design of high-performance lightweight protective energy absorbers is presented. The framework utilize ideas inspired by nature and hierarchical designs in order to improve energy absorption capacities.

Graphical abstract