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<p>This study presents a novel approach to reinforcing concrete pipelines using 3D-printed auxetic tubular structures (ATS). These structures, featuring V-shaped reentrant unit cells (VRU), were fabricated from ABS resin via digital light processing (DLP) 3D printing. By systematically varying the wall thickness (0.5&#xa0;mm, 1.0&#xa0;mm, 1.5&#xa0;mm) and reentrant angle (120°, 140°, 160°), the research evaluated their impact on Poisson’s ratio, stiffness, energy absorption, and stress distribution. All configurations exhibited negative Poisson’s ratios, with the most pronounced auxetic behavior observed at 0.5&#xa0;mm thickness and 120° angle, achieving a Poisson’s ratio of -0.742. Stiffness increased significantly with both wall thickness and reentrant angle, reaching up to 120&#xa0;N/mm at 1.5&#xa0;mm thickness and 160° angle. Energy absorption also scaled with thickness, with the 1.5&#xa0;mm thick structures at 140° angle absorbing up to 639&#xa0;mJ. The configuration with 1.5&#xa0;mm thickness and 140° angle was identified as optimal, offering a balance of high energy absorption (639&#xa0;mJ), moderate stiffness, and uniform stress distribution. Finite element analysis (FEA) validated the experimental findings, with discrepancies below 5%, confirming the potential of these novel 3D-printed ATS to enhance the structural integrity of concrete pipelines under dynamic loads.</p> Graphical abstract

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Optimizing auxetic tubular structures (ATS) for concrete pipeline reinforcement: parametric analysis for enhanced pipeline structural integrity

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Hongwei Zhong,
  • Mostafa Habibi,
  • Nejib Ghazouani

摘要

This study presents a novel approach to reinforcing concrete pipelines using 3D-printed auxetic tubular structures (ATS). These structures, featuring V-shaped reentrant unit cells (VRU), were fabricated from ABS resin via digital light processing (DLP) 3D printing. By systematically varying the wall thickness (0.5 mm, 1.0 mm, 1.5 mm) and reentrant angle (120°, 140°, 160°), the research evaluated their impact on Poisson’s ratio, stiffness, energy absorption, and stress distribution. All configurations exhibited negative Poisson’s ratios, with the most pronounced auxetic behavior observed at 0.5 mm thickness and 120° angle, achieving a Poisson’s ratio of -0.742. Stiffness increased significantly with both wall thickness and reentrant angle, reaching up to 120 N/mm at 1.5 mm thickness and 160° angle. Energy absorption also scaled with thickness, with the 1.5 mm thick structures at 140° angle absorbing up to 639 mJ. The configuration with 1.5 mm thickness and 140° angle was identified as optimal, offering a balance of high energy absorption (639 mJ), moderate stiffness, and uniform stress distribution. Finite element analysis (FEA) validated the experimental findings, with discrepancies below 5%, confirming the potential of these novel 3D-printed ATS to enhance the structural integrity of concrete pipelines under dynamic loads.

Graphical abstract