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<p>This study presents a novel approach to significantly enhancing the tear resistance and energy dissipation capacity of polyurea composites through helical auxetic yarns (HAYs) reinforcement. Through systematic experimental investigations combining the digital speckle correlation method (DSCM), mechanical testing, and microstructural analysis, we demonstrate that optimized HAYs-reinforced composites achieve remarkable performance improvements. Key findings reveal that composites with a 5° winding angle, 9:1 diameter ratio, and epoxy cladding exhibit: (1) 3.40 ~ 8.60 times greater tear strength than pure polyurea, (2) maximum tear energy dissipation of 2.53 × 10⁶ J/m<sup>3</sup>, and (3) 2.36 times enhancement in energy absorption capacity. The composite’s superior performance stems from its unique three-stage deformation mechanism: elastic deformation (0.0128 strain), extended plastic deformation (35 mm displacement, 1.15 strain), and ultimate failure. DSCM analysis confirms that the negative Poisson’s ratio effect and interfacial friction between HAYs and polyurea matrix create a multi-level energy dissipation system. This work establishes new design ideas for advanced protective materials by quantitatively demonstrating that HAYs architecture can be engineered to improve tear resistance and energy absorption simultaneously.</p>

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Polyurea composite coating with polyester–carbon fiber HAYs: tear properties, behavior, and damage mechanism

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • Xia Yu,
  • Yanxuan Ma,
  • Yun Zhang,
  • Peng Wang,
  • Jin Liu,
  • Zhipeng Zhang,
  • Shuaifei Wang,
  • Yuhua Gao

摘要

This study presents a novel approach to significantly enhancing the tear resistance and energy dissipation capacity of polyurea composites through helical auxetic yarns (HAYs) reinforcement. Through systematic experimental investigations combining the digital speckle correlation method (DSCM), mechanical testing, and microstructural analysis, we demonstrate that optimized HAYs-reinforced composites achieve remarkable performance improvements. Key findings reveal that composites with a 5° winding angle, 9:1 diameter ratio, and epoxy cladding exhibit: (1) 3.40 ~ 8.60 times greater tear strength than pure polyurea, (2) maximum tear energy dissipation of 2.53 × 10⁶ J/m3, and (3) 2.36 times enhancement in energy absorption capacity. The composite’s superior performance stems from its unique three-stage deformation mechanism: elastic deformation (0.0128 strain), extended plastic deformation (35 mm displacement, 1.15 strain), and ultimate failure. DSCM analysis confirms that the negative Poisson’s ratio effect and interfacial friction between HAYs and polyurea matrix create a multi-level energy dissipation system. This work establishes new design ideas for advanced protective materials by quantitatively demonstrating that HAYs architecture can be engineered to improve tear resistance and energy absorption simultaneously.