Novel, bioinspired, aligned-discontinuous reclaimed fibre composites for enhanced compressive performance

新型、仿生、排列不连续再生纤维复合材料可增强压缩性能

• 批准号: 2747463
• 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: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2747463
• 关键词: Novel; bioinspired; aligned; discontinuous; reclaimed

Despite over 60 years of active research and considerable improvements in properties relating to tensile strength and impact resistance, compressive strength levels in composites are still some 40% lower than measured longitudinal tensile strengths. This relative weakness, and the difficulty in systematically modelling the resultant anisotropic failure mechanisms, represents a significant barrier to the wider industrial adoption of these materials. This research project forms part of the EPSRC supported Next Generation Fibre-Reinforced Composites (NextCOMP) programme, concentrated on developing novel composite materials to meet this challenge. A principal focus is investigating hierarchically structured materials, inspired by natural composites such as bone and wood. These biomaterials feature dissimilar but complementary reinforcement systems across length scales and exhibit higher compressive load carrying capacities than traditional manufactured composites. It is anticipated that a new generation of manufactured composite materials able to mimic such architectures will find numerous innovative industrial applications including in the aerospace, energy, and automotive sectors. Discontinuous fibrous materials have historically been used as bulk reinforcement in manufactured composite structures due to lower overall mechanical properties. A key determinant of their performance being the degree of fibre alignment. The High-Performance Discontinuous Fibre (HiPerDif) process developed at the University of Bristol is a proven method for producing composite tapes of highly aligned discontinuous fibres of between 1 and 12mm in length, utilising water as a transfer medium. The process offers the potential to produce materials with mechanical properties comparable to those of continuous fibre composites, given a fibre aspect ratio high enough to allow load transfer and fibre pull out. Furthermore, highly aligned fibre composites have shown strong promise in overcoming current limitations of continuous fibre materials such as: lack of ductility, and the resultant restrictions in available forming methods; difficulties in high volume, defect-free automated production of complex geometries; and integration of the truly sustainable production methods required in a circular economy. This project will investigate the behaviour of a range of manufactured highly aligned fibrous materials in compression and assess their potential for use in the hierarchically structured composite materials being researched within the NextCOMP programme. AIMS - Investigate the behaviour of a range of highly-aligned discontinuous carbon-fibre composites in compression. - Assess the potential for utilising these materials within larger composite structures, inspired by natural composites, and featuring hierarchical architectures. - Investigate potential processing methods for such composites that improve beneficial material property and production rate characteristics. To include mechanised processes such as automated tape laying, prepreg filament winding and human-robot collaboration. - Undertake trials of discontinuous fibre composites to determine compressive performance and manufacturing efficiency. - Manufacture, test and assess demonstration structures, featuring discontinuous fibre composites as one element within a more complex hierarchical architecture. Structural geometries and material composition to be industrially relevant. OBJECTIVES - Identify and assess processing methodologies and sources of discontinuous carbon-fibre composite materials. - Determine appropriate geometries and manufacturing methods for useful sample and demonstrator testing and data acquisition. - Acquire suitable experience in using automated composite processing methods. - Identify suitable mechanical testing regimes that generate useful and repeatable comparative data. - Continually assess results in the context of the NextCOMP program.

尽管经过 60 多年的积极研究，拉伸强度和抗冲击性相关性能有了显着改进，但复合材料的压缩强度水平仍然比测量的纵向拉伸强度低约 40%。这种相对弱点以及对由此产生的各向异性失效机制进行系统建模的困难，成为这些材料在工业上更广泛采用的重大障碍。该研究项目是 EPSRC 支持的下一代纤维增强复合材料 (NextCOMP) 计划的一部分，专注于开发新型复合材料来应对这一挑战。主要重点是研究分层结构材料，其灵感来自天然复合材料，例如骨头和木材。这些生物材料在长度尺度上具有不同但互补的增强系统，并且比传统制造的复合材料表现出更高的压缩承载能力。预计能够模仿此类结构的新一代复合材料将在航空航天、能源和汽车领域等领域找到许多创新的工业应用。由于整体机械性能较低，不连续纤维材料历来被用作制造复合结构中的整体增强材料。其性能的关键决定因素是光纤排列程度。布里斯托大学开发的高性能不连续纤维 (HiPerDif) 工艺是一种经过验证的方法，可利用水作为传输介质，生产长度在 1 至 12 毫米之间的高度排列不连续纤维复合带。该工艺提供了生产机械性能与连续纤维复合材料相当的材料的潜力，只要纤维长径比足够高以允许负载转移和纤维拉出。此外，高度排列的纤维复合材料在克服连续纤维材料目前的局限性方面显示出强大的前景，例如：缺乏延展性，以及由此导致的可用成型方法的限制；复杂几何形状的大批量、无缺陷自动化生产存在困难；以及循环经济所需的真正可持续生产方法的整合。该项目将研究一系列制造的高度排列纤维材料在压缩过程中的行为，并评估它们在 NextCOMP 计划中正在研究的分层结构复合材料中的应用潜力。目标 - 研究一系列高度排列的不连续碳纤维复合材料在压缩过程中的行为。 - 受天然复合材料的启发，并具有分层结构，评估在更大的复合结构中使用这些材料的潜力。 - 研究此类复合材料的潜在加工方法，以提高有益的材料性能和生产率特征。包括机械化工艺，例如自动铺带、预浸料纤维缠绕和人机协作。 - 对不连续纤维复合材料进行试验，以确定压缩性能和制造效率。 - 制造、测试和评估示范结构，将不连续纤维复合材料作为更复杂的分层架构中的一个元素。结构几何形状和材料成分与工业相关。目标 - 识别和评估不连续碳纤维复合材料的加工方法和来源。 - 确定有用的样品和演示器测试和数据采集的适当几何形状和制造方法。 - 获得使用自动化复合加工方法的适当经验。 - 确定合适的机械测试制度，生成有用且可重复的比较数据。 - 持续评估 NextCOMP 计划的结果。