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Tailored fibre placement of commingled carbon-thermoplastic fibres for notch-insensitive composites

机译：缺口不敏感复合材料的混合碳热塑性纤维的量身定制纤维放置

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摘要

Tailored fibre placement (TFP) is an embroidery-based technology that allows the fibre tows to be placed exactly where they are most needed for structural performance and stitched into position on a compatible textile or polymer substrate. In this study commingled carbon-nylon fibre tows were utilised to produce thermoplastic cross-ply net-shaped preforms using TFP. Four TFP composite plaques were manufactured; baseline (blank), machined-hole, tailored-hole-1 and tailored-hole-2. Steering the tows was used to create the hole in tailoredhole-1 and tailored-hole-2. In comparison to the design of tailored-hole-1, a different fibre trajectory, with a circular reinforcement around the hole, was suggested for the tailored-hole-2. Fibre volume fraction, optical microscopy, X-ray-CT scans, tensile and open-hole tests were carried out. With the exception of the baseline sample, the modified design of tailored-hole-2 composite exhibited the highest axial strength and modulus compared to the machined-hole and tailored-hole-1 composites. Only the tailored-hole-2 specimens exhibited less than 10% reduction of the notched strength compared to the un-notched strength. This study highlights the importance of the stress/load-paths and associated fibre-orientations. While TFP can be an extremely valuable design tool for composite preforms and resulting structural components, a deep understanding of stress distributions is inevitable to achieve optimal TFP-design.
机译：量身定制的纤维铺放（TFP）是一项基于刺绣的技术，可将纤维束准确地放置在最需要其结构性能的位置，并缝在兼容的纺织品或聚合物基材上。在这项研究中，混合碳尼龙纤维丝束被用于使用TFP生产热塑性交叉网状预型件。制造了四个TFP复合板；基线（空白），加工孔，定制孔1和定制孔2。操纵拖缆用于在定制孔1和定制孔2中创建孔。与定制孔1的设计相比，建议对定制孔2使用不同的纤维轨迹，并在孔周围进行圆形加固。进行了纤维体积分数，光学显微镜，X射线CT扫描，拉伸和开孔测试。除基线样品外，与加工孔和定制孔1复合材料相比，定制孔2复合材料的改进设计具有最高的轴向强度和模量。与没有缺口的强度相比，只有定制的2孔试样的缺口强度降低了不到10％。这项研究强调了应力/载荷路径和相关纤维取向的重要性。尽管TFP可能是用于复合材料预成型坯和所得结构部件的极有价值的设计工具，但对应力分布的深入了解是实现最佳TFP设计的必然选择。

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  • 来源
    《Composite Structures》 |2019年第4期|348-358|共11页
  • 作者

    El-Dessouky H. M.; Saleh M. N.; Gautam M.; Han G.; Scaife R. J.; Potluri P.;

  • 作者单位

    Univ Sheffield, Composite Ctr, AMRC Boeing, Rotherham S60 5TZ, S Yorkshire, England|Mansoura Univ, Fac Sci, Phys Dept, Mansoura 35516, Egypt;

    Delft Univ Technol, Fac Aerosp Engn, Struct Integr & Composites, NL-2628 CD Delft, Netherlands;

    Univ Manchester, Sch Mat, Oxford Rd, Manchester M13 9PL, Lancs, England;

    AMRC Korea, Gyongsan 38463, Gyeongsangbuk D, South Korea;

    Univ Sheffield, Composite Ctr, AMRC Boeing, Rotherham S60 5TZ, S Yorkshire, England;

    Univ Manchester, Sch Mat, Oxford Rd, Manchester M13 9PL, Lancs, England;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Thermoplastics; Tailored fibre placement; Composites; Mechanical properties; Notch sensitivity;

    机译：热塑性塑料;固定纤维的位置;复合材料;机械性能;缺口敏感性;

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