Analysis of the vacuum infusion moulding process
Analysis of the vacuum infusion moulding process
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真空灌注成型工艺分析
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
N. Correia
中科院分区：
文献类型：
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作者：
N. Correia
本论文的重点是流动通过顺应性多孔介质与应用程序的制造复合材料的真空注入（VI）。这项工作的背景是需要在复合材料的环境友好的复合加工方法的可靠性。商业现实和运输业低成本结构的应用前景表明，应适当重视获得鲁棒性模拟，确保可靠性，并朝着有效的过程控制手段发展。在这种情况下，必须取代用于生产大型复合结构的开模制造工艺，这种工艺不利于质量和环境责任。因此，建立复合材料作为一个可行的替代需要封闭的成型技术，其中VI是最实用的大型结构，但在可靠性是需要经济生存。
这项工作解决了这个问题的许多方面，通过创新地利用流体力学和开发，实施和提出新的分析和建模工具VI。主要成果包括一个有效的分析模型，通过顺应性介质的流动，纺织增强材料的遵守，VI和新的随机技术的有限元模型的研究在液体复合材料成型过程中的可靠性分析。
本文讨论的工作源于对已发表的模型的全面评估，并导致VI的新的流动建模工具，包括纺织品合规性的独特和一般的形式主义。使用这些工具，有可能研究，第一次，不同的参数对VI制造的影响。的可靠性问题得到解决，通过整合随机模型的顺应性和渗透性，并通过适应商业有限元流动代码（LIMS）的能力，以模拟复杂的几何形状。
This thesis focuses on flow through compliant porous media with applications to the manufacturing of composites by vacuum infusion (VI). The context of this work is the need for reliability in environmentally friendly composite processing methods for composite materials. Commercial reality and the prospective application to low cost structures for the transportation industry dictate that appropriate emphasis should be put on obtaining robust simulations, ensuring reliability and progressing toward efficient means of process control. In this context, the open mould manufacturing processes which have been used to produce large composite structures, and are not conducive to quality nor environmental responsibility, must be replaced. Hence, establishing composites as a viable alternative requires closed moulding techniques, of which VI is the most practical for large structures, but where reliability is required for economic survival.
This work addresses many aspects of this problem, by making innovative use of fluid mechanics and developing, implementing and proposing new analysis and modelling tools for VI. Main results include a validated analytical model for flow through compliant media, a study of the compliance of textile reinforcements, a finite element model for VI and novel stochastic techniques for the analysis of reliability in liquid composite moulding processes.
The work discussed herein stems from a thorough evaluation of published models and leads to novel flow modelling tools for VI including a unique and general formalism for textile compliance. Using these tools it was possible to study, for the first time, the effect of different parameters on VI manufacturing. The reliability issue was addressed by integrating stochastic models for compliance and permeability, and the ability to model complex geometries was demonstrated by adapting a commercial finite element flow code (LIMS).