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Study the permeability of multi-layer woven fabrics.

机译：研究多层机织织物的渗透性。

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摘要

The aim of this study is to explore the permeability of 3D multi-layer woven fabrics and the mechanism of void formation due to the permeability difference within it. The results provide theoretical support for designing and producing high-performance composite materials.; Realizing the limitations of most existing models, which do not offer a realistic representation of the woven fabric architecture, the present developments introduce the notion of a micro/macro unit cell from a different perspective and are based on a more realistic representation of the three-dimensional fabric architecture which includes stitch, spacing and other fabric parameters. New models to study the effect of fabric microstructure and other properties of 3D multi-layer woven fabrics on permeability have been discussed. A permeability model based on fractal theory was established to predict the permeability of the preform fabricated with porous yarns. At the same time, another permeability model based on a unit cell of quadratic fibre packing was also proposed to predict the permeability of the 3D multi-layer woven fabrics fabricated with mono-filaments. It has been demonstrated that stitch structure plays an important role in the permeability of 3D multi-layer woven fabrics. The relationship between the fabric microstructure parameters and permeability has been established. The experimental validation of these two models was conducted over a series of stitch structures and the tendency predicted by the model agreed with the experimental data.; The mechanism of void formation in the multi-layer woven fabrics was also studied. The objective of current study is to carry out a theoretical analysis of in-plane impregnation in multi-layer woven fabrics (MWFs) to understand the mechanism of void formation. Unlike the previous work, where the void was formed in the plane of one layer of woven fabric, in this thesis void formation in a cross-section of MWFs was studied. In this thesis, two simplified unit cells for in-plane impregnation in multi-layer woven fabrics were suggested. A mathematical model was developed to describe the mechanism of void formation during the resin transfer moulding (RTM) processes. The flow fronts and void formation in these two cells were also numerically simulated using the control-volume method. The simulated results agree well with the results predicted by the mathematical models and verified by the experimental studies. The results show that, for a given fibre preform, the ratio of the weft axial permeability to the warp transverse permeability is responsible for the formation of void and the void size. (Abstract shortened by UMI.)
机译：这项研究的目的是探索3D多层机织织物的渗透性以及由于内部渗透率差异而形成空隙的机理。研究结果为设计和生产高性能复合材料提供了理论支持。考虑到大多数现有模型的局限性，它们不能提供机织织物体系结构的真实表示，因此，本研究从不同的角度介绍了微/宏单元的概念，并基于三种模型的更实际表示。三维织物结构，包括针迹，间距和其他织物参数。讨论了研究织物微观结构和3D多层机织织物其他性能对渗透性的影响的新模型。建立了基于分形理论的渗透性模型，以预测多孔纱预制件的渗透性。同时，还提出了另一种基于二次纤维堆积的晶胞的渗透性模型，以预测用单丝制造的3D多层机织织物的渗透性。已经证明，针迹结构在3D多层机织织物的渗透性中起重要作用。建立了织物微结构参数与渗透性之间的关系。这两个模型的实验验证是在一系列针迹结构上进行的，模型预测的趋势与实验数据相符。还研究了多层机织织物中孔隙的形成机理。本研究的目的是对多层机织织物（MWFs）的平面内浸渍进行理论分析，以了解形成空隙的机理。与以前的工作不同，空隙是在一层织物的平面上形成的，与以前的工作不同，本论文研究了MWF横截面中的空隙的形成。本文提出了两个简化的用于多层机织织物平面内浸渍的晶胞。建立了数学模型来描述在树脂传递模塑（RTM）过程中形成空隙的机理。还使用控制体积方法对这两个单元中的流动前沿和空隙形成进行了数值模拟。仿真结果与数学模型预测的结果和实验研究验证的结果吻合良好。结果表明，对于给定的纤维预成型坯，纬纱轴向渗透率与经纱横向渗透率之比是形成空隙和空隙尺寸的原因。 （摘要由UMI缩短。）

著录项

  • 作者

    Yi, Liu.;

  • 作者单位

    Hong Kong Polytechnic University (People's Republic of China).;

  • 授予单位 Hong Kong Polytechnic University (People's Republic of China).;
  • 学科 Textile Technology.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 258 p.
  • 总页数 258
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 轻工业、手工业;
  • 关键词

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