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首页> 外文会议>Innovative Solutions for the Advancement of the Transport Industry >OPTIMISATION OF LIQUID MOULDING TECHNIQUES APPLIED TOTHE PRODUCTION OF COMPOSITE MATERIALS FOR AUTOMOTIVEAPPLICATIONS
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OPTIMISATION OF LIQUID MOULDING TECHNIQUES APPLIED TOTHE PRODUCTION OF COMPOSITE MATERIALS FOR AUTOMOTIVEAPPLICATIONS

机译：用于汽车应用的复合材料生产中的液态成型技术的优化

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Liquid moulding techniques, in which a thermosetting resin flows through fibrous dryrnreinforcements, are commonly used in composite material production. In particular, the presentrnstudy focuses on Resin Transfer Moulding (RTM) and Vacuum Assisted Resin TransferrnMoulding (VARTM) processing techniques.rnIn the case of a RTM technique, a dry reinforcement is embedded in a mould cavity, whereafter arnthermosetting resin is forced to flow in the cavity and wets the reinforcement itself whilst pushingrnout the air. After the cure process, the components are extracted from the mould and can be usedrnwithout any additional refinement operations. The infusion pressures are quite low (69 ÷ 690 kPa)rn[1] and any kind of fibre and reinforcement configurations may be used. In VARTM, the infusionrnpressures are lower than in the RTM, thanks to the vacuum application that promotes the infusionrnstep and the air evacuation.rnIn the last few years, the automotive and nautical industries have shown increasing interest inrnthese techniques for the production of light components, but they also need to satisfyrnrequirements of enhanced speed and automation for the aforesaid process. For this reason, severalrnresearch paths have been followed:rn? A search for both highly reactive resins and high performance, light and high permeabilityrnreinforcements.rn?rnThe use of software instruments for correct modelling during the infusion stage.rn? A definition of industrial strategies for the improvement of product quality, reproducibilityrnand cost saving.rnIn this study, models of the reinforcement permeability (based on the Carman-Kozeny equation),rnand of the infusion stages for the RTM and VARTM techniques applied to both glass– and flax–rnreinforced composite materials were developed. These models permitted the prediction ofrninfusion times when the processing parameters (infusion and cavity pressure), mould geometryrnand temperature, resin characteristics and the reinforcements’ volume fraction have been defined.rnObviously, the results obtained for simple geometries can be extended to components havingrnmore complex shapes and larger dimensions.
机译：在复合材料生产中通常使用液体模塑技术，其中热固性树脂流过纤维状的干增强材料。本研究特别着重于树脂传递模塑（RTM）和真空辅助树脂传递模塑（VARTM）加工技术。对于RTM技术，将干增强材料嵌入模具型腔中，然后强制将热固性树脂流入空腔并润湿增强材料本身，同时推出空气。在固化过程之后，将组件从模具中取出，无需任何其他精制操作即可使用。灌注压力非常低（69÷690 kPa）rn [1]，可以使用任何种类的纤维和增强材料。在VARTM中，由于真空应用促进了输液步骤和空气疏散，因此输液压力比RTM更低。在过去的几年中，汽车和航海行业对这种用于生产轻型零件的技术越来越感兴趣，但是他们还需要满足上述过程对提高速度和自动化的要求。因此，遵循了以下几种研究路径：寻求高反应性树脂以及高性能，轻质和高渗透性的增强材料。rn？rn在输液阶段使用软件工具进行正确建模。定义用于提高产品质量，可重复性和节省成本的工业策略。rn在本研究中，模型的增强渗透性模型（基于Carman-Kozeny方程），适用于两种玻璃的RTM和VARTM技术的注入阶段–和亚麻增强复合材料的开发。这些模型允许在定义了加工参数（浇注和型腔压力），模具几何形状和温度，树脂特性以及增强材料的体积分数时预测浇注时间。显然，对于简单的几何形状，可以将结果扩展到具有更复杂形状的部件和更大的尺寸。

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