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<p>This study investigated the influence of printing parameters on the structural formation and mechanical properties of helicoidal structures produced through layer-by-layer filament material extrusion using PA12 and PA12/20 carbon fiber composite filaments. Research has revealed a significant correlation between track width (0.3–0.9&#xa0;mm) and structural morphology, with narrower tracks (0.3&#xa0;mm) producing more uniform void distributions and superior impact strengths (135.9 ± 4.6&#xa0;kJ/m<sup>2</sup> for PA12 and 57.2 ± 1.2&#xa0;kJ/m<sup>2</sup> for PA12/20). The track overlap shift emerged as a critical parameter, with enhanced fracture toughness and flexural strength achieved at 0.25&#xa0;mm shifting. Compared with pure PA12, the introduction of carbon fibers resulted in 30–50% greater strength but reduced impact resistance by approximately 2–2.5 times. Notably, the fiber orientation varied with track width, being perpendicular to the cross-sectional plane at 0.3&#xa0;mm and more parallel at 0.9&#xa0;mm, affecting the interlayer bonding characteristics. The study demonstrated that enhanced mechanical properties are achieved through a minimized track width of 0.3&#xa0;mm and an overlap shift of 0.25–0.3&#xa0;mm. The material selection between PA12 and PA12/20 should be based on specific application requirements, with pure PA12 excelling in dynamic loading scenarios and the composite showing superior static load resistance.</p>

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Manipulating the Properties and Failure Mechanisms of 3D-Printed Bio-Inspired Helicoidal Structures Made from PA12 and PA12-CF Filament

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Danil Erutin,
  • Reynaldo Castellanos,
  • Anatoly Popovich,
  • Vadim Sufiiarov

摘要

This study investigated the influence of printing parameters on the structural formation and mechanical properties of helicoidal structures produced through layer-by-layer filament material extrusion using PA12 and PA12/20 carbon fiber composite filaments. Research has revealed a significant correlation between track width (0.3–0.9 mm) and structural morphology, with narrower tracks (0.3 mm) producing more uniform void distributions and superior impact strengths (135.9 ± 4.6 kJ/m2 for PA12 and 57.2 ± 1.2 kJ/m2 for PA12/20). The track overlap shift emerged as a critical parameter, with enhanced fracture toughness and flexural strength achieved at 0.25 mm shifting. Compared with pure PA12, the introduction of carbon fibers resulted in 30–50% greater strength but reduced impact resistance by approximately 2–2.5 times. Notably, the fiber orientation varied with track width, being perpendicular to the cross-sectional plane at 0.3 mm and more parallel at 0.9 mm, affecting the interlayer bonding characteristics. The study demonstrated that enhanced mechanical properties are achieved through a minimized track width of 0.3 mm and an overlap shift of 0.25–0.3 mm. The material selection between PA12 and PA12/20 should be based on specific application requirements, with pure PA12 excelling in dynamic loading scenarios and the composite showing superior static load resistance.