Predicting the performance of sustainable composite materials in a range of manufacturing techniques

预测可持续复合材料在一系列制造技术中的性能

• 批准号: 2738837
• 金额: --
• 依托单位: University of Bristol
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2738837
• 关键词: Predicting; performance; sustainable; composite; materials

Recycled carbon fibre (rCF) composites are a valuable solution for industries such as aerospace to move towards a more closed-loop manufacturing model. Reclaiming fibres from manufacturing waste or end-of-life (EoL) components increases the material efficiency of composite materials and decreases their environmental impact of subsequent laminates due to their lower embodied energies from cradle to gate. Recyclates are also cheaper to manufacture than their virgin counterparts. RCF does have its own drawbacks. Depending on the recycling process used, the fibre's modulus, strength and surface energy can be diminished. In addition to this, the majority of economically viable recycling processes chop the fibre into lengths typically between 3-25mm. The result of this is that rCF materials are often downcycled into components that do not require the same load-bearing capabilities as virgin carbon fibre (vCF) components. This is because most recycled materials are in the form of randomly oriented discontinuous fibre mats and therefore do not possess the anisotropic mechanical properties or high fibre volume fractions required for more structural applications. This is not the best use of this valuable material. This is where fibre realignment techniques, such as High-Performance Discontinuous Fibre (HiPerDiF), are closing the discrepancy between vCF and rCF composite fabrics by transforming waste fibres between the lengths of 1 and 12mm into realigned tapes. Laminates made from these tapes have been manufactured using a range of methods such as autoclave, hot press and 3D printing, yet there has not yet been a characterisation of the ability to manufacture these aligned discontinuous materials using liquid composite moulding (LcM) techniques.This PhD will aim to characterise the ability to manufacture aligned discontinuous fabrics using a selected range of LcM techniques for structural aerospace components. In particular, there is interest in whether the discontinuous aligned fabrics will be displaced by the resin front, known as fibre washout. The degree of alignment of the laminates' fibres, fibre overlap, and fibre volume fraction will be measured and compared to the mechanical properties. The mechanical characterisation methods used will include a range of quasi-static, high-rate and hot/wet tests to understand the full scope of both the simple static response and durability of these laminates. After both proof of concept and bench scale specimens have been created, the materials will then be applied to a demonstrator case study. Mechanical testing of this component will then take place as a way of comparing the current materials and manufacturing methods. A finite element analysis (FEA) modelled will be created to validate the load distribution on the materials compared with the structure. Finally, a life cycle assessment (LCA) can be made to show the impact of using reclaimed materials instead of virgin. This will help to strengthen the case for using recyclates in more challenging structural applications.This project is supported by GKN Aerospace.

回收碳纤维（RCF）复合材料是航空航天等行业的宝贵解决方案，可以朝着更闭环的制造模型迈进。从制造废物或寿命终止（EOL）组件中回收纤维会提高复合材料的材料效率，并减少其随后层压板​​的环境影响，这是由于其从摇篮到门的较低体现的能量。循环系统的制造也比原始的对应物便宜。 RCF确实有自己的缺点。根据所使用的回收过程，纤维的模量，强度和表面能可以降低。除此之外，大多数经济可行的回收过程通常将纤维切成3-25mm之间的长度。这样的结果是，RCF材料通常被降低成组件，这些组件不需要与维珍碳纤维（VCF）组件相同的承载能力。这是因为大多数再生材料都是随机取向的不连续纤维垫的形式，因此不具有更结构应用所需的各向异性机械性能或高纤维体积分数。这不是这种有价值的材料的最佳用途。这是纤维重新调整技术（例如高性能不连续纤维（HiperDif））通过将1和12mm之间的废物之间的长度转换为重新匹配的磁带，从而结束VCF和RCF复合织物之间的差异。由这些磁带制成的层压板是使用一系列方法（例如高压灭菌，热媒体和3D打印）制造的，但是尚无对制造这些与液体复合成型（LCM）技术制造这些结盟不连续材料制造的能力的特征，该博士学位将旨在使用稳定的Failers complace Fabie fornique complace complace complace fornique comption fornique complectique。特别是，人们对不连续排列的织物是否会被树脂阵线（称为纤维冲洗量）取代。将测量层压板纤维，纤维重叠和纤维体积分数的比对程度，并将其与机械性能进行比较。所使用的机械表征方法将包括一系列准静态，高速和热/湿测试，以了解这些层压板的简单静态响应和耐用性的全部范围。在创建了概念证明和基准标本证明之后，材料将应用于示范案例研究。然后，该组件的机械测试将作为比较当前材料和制造方法的一种方式。将创建建模的有限元分析（FEA），以验证与结构相比的材料上的负载分布。最后，可以进行生命周期评估（LCA），以显示使用再生材料而不是维珍的影响。这将有助于加强在更具挑战性的结构应用中使用回收物的案例。该项目得到了GKN航空航天的支持。