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Elastic properties and multi-scale design of long carbon fiber nonwoven reinforced plane-based isotropic composite

机译：长碳纤维无纺布增强平面各向同性复合材料的弹性性能和多尺度设计

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摘要

Carbon fiber reinforced composite is considered as a potential substitutes used in the lightweight of automotive engineering. Nevertheless, the high price and complicated manufacturing process remain challenges for the large-scale application of conventional carbon fibers. In this study, a novel plane isotropic composite reinforced by long carbon fiber non-woven is introduced, which overcomes the obstacles in the application of carbon fiber at present. A multi-scale optimization method is proposed to realize the performance optimization and lightweight design of composite components. The linear elastic properties of long carbon fiber non-woven composite (LCFNC) were studied experimentally and analytically. The predictions of homogenization theory were found to be very similar to the experimental results within an interval of volume fraction. Then the relationship between microstructure and material performance was evaluated in detail. The results showed that there is a critical point for the influence of aspect ratio to the material properties. Thirdly, thickness of LCFNC at macro scales and the fiber parameters at micro scales were simultaneously optimized by Non-dominated sorting genetic algorithm-II (NSGA- II) to enforce multi-objective optimization design. Finally, the lightweight design of automobile hood was performed by the LCFNC and the proposed method. The results showed that the weight of automobile hood was reduced by 37%, while exhibiting better stiffness and strength performance compared with the conventional steel.
机译：碳纤维增强复合材料被认为是汽车工程轻质中使用的潜在替代品。尽管如此，高价和复杂的制造过程仍然是常规碳纤维大规模应用的挑战。在该研究中，引入了长碳纤维无纺布增强的新型平面各向同性复合材料，其克服了目前碳纤维在施加施加的障碍。提出了一种多尺度优化方法来实现复合部件的性能优化和轻量级设计。实验和分析研究了长碳纤维无纺布复合材料（LCFNC）的线性弹性性能。发现对均质化理论的预测与体积分数间隔内的实验结果非常相似。然后详细评估微观结构和材料性能之间的关系。结果表明，纵横比与材料特性的影响存在临界点。第三，通过非主导的分类遗传算法-II（NSGA-II）同时优化LCFNC在微量尺度下的LCFNC厚度，以实施多目标优化设计。最后，通过LCFNC和所提出的方法进行汽车罩的轻质设计。结果表明，与传统钢相比，汽车罩的重量减少了37％，同时表现出更好的刚度和强度性能。

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  • 来源
    《Composite Structures》 |2020年第11期|112657.1-112657.13|共13页
  • 作者

    He Z. C.; Shi X.; Li Eric; Li X. K.;

  • 作者单位

    Hunan Univ State Key Lab Adv Design & Mfg Vehicle Body Changsha 410082 Peoples R China;

    Hunan Univ State Key Lab Adv Design & Mfg Vehicle Body Changsha 410082 Peoples R China;

    Teesside Univ Sch Comp Engn & Digital Technol Middlesbrough Cleveland England;

    Hunan Univ State Key Lab Adv Design & Mfg Vehicle Body Changsha 410082 Peoples R China;

  • 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

    Long carbon fiber nonwovens; Plane isotropic composite; Lightweight; Multi-scale optimization;

    机译：长碳纤维非织造织物;平面各向同性复合材料;轻量级;多尺度优化;

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