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<p>To address the problem of insufficient toughness of carbon fiber (CF) reinforced thermosetting epoxy (EP) composites, a discontinuous fiber/thermoplastic PA12 particle co-toughened CF/EP composite laminate was designed in this paper to maximize its toughness while considering its high strength advantages. Firstly, inspired by the strong and tough biological structures in nature, a discontinuous fiber/interlayer toughened CF/EP laminate structure and its forming process were proposed. Secondly, a three-point bending (3&#xa0;PB) finite element simulation of the discontinuous fiber laminate was conducted to investigate the influence of the discontinuous fiber structural parameters on the mechanical properties. The optimized design of the discontinuous fiber toughened laminate structure was hence carried out based on machine learning. Then, the interlaminar fracture toughness, interlaminar shear strength, and 3&#xa0;PB tests of interlaminar toughened laminates were carried out to investigate the influence of the type of interlaminar toughened material and its density on the mechanical properties of the laminates. Finally, it was experimentally demonstrated that the discontinuous structure and interlaminar toughening method yielded a joint toughening effect.</p>

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A discontinuous fiber/thermoplastic PA12 particle co-toughening method for carbon fiber-reinforced thermosetting epoxy composite laminates

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Hong Xiao,
  • Shuai Wang,
  • Ziqi Hao,
  • Tianqi Liu,
  • Zhongqiu Ding,
  • Yugang Duan

摘要

To address the problem of insufficient toughness of carbon fiber (CF) reinforced thermosetting epoxy (EP) composites, a discontinuous fiber/thermoplastic PA12 particle co-toughened CF/EP composite laminate was designed in this paper to maximize its toughness while considering its high strength advantages. Firstly, inspired by the strong and tough biological structures in nature, a discontinuous fiber/interlayer toughened CF/EP laminate structure and its forming process were proposed. Secondly, a three-point bending (3 PB) finite element simulation of the discontinuous fiber laminate was conducted to investigate the influence of the discontinuous fiber structural parameters on the mechanical properties. The optimized design of the discontinuous fiber toughened laminate structure was hence carried out based on machine learning. Then, the interlaminar fracture toughness, interlaminar shear strength, and 3 PB tests of interlaminar toughened laminates were carried out to investigate the influence of the type of interlaminar toughened material and its density on the mechanical properties of the laminates. Finally, it was experimentally demonstrated that the discontinuous structure and interlaminar toughening method yielded a joint toughening effect.