The re-manufacture and repairability of poly(ether ether ketone) discontinuous carbon fibre composites
The re-manufacture and repairability of poly(ether ether ketone) discontinuous carbon fibre composites
复制标题
聚醚醚酮不连续碳纤维复合材料的再制造及可修复性
DOI：
10.1002/pi.6220
复制
发表时间：
2021
影响因子：
3.2
通讯作者：
Erland S
中科院分区：
文献类型：
--
作者：
Erland S
碳纤维增强聚合物的一个主要限制是由于通常使用热固性树脂基质和连续纤维，因此不适合维修和回收过程。先进的热塑性不连续纤维模塑料（DFMC）现在为高性能部件提供了一种替代方案。虽然DFMC无法与连续纤维增强材料的原始性能相匹配，但埃克塞特大学开发的压缩成型技术使聚醚醚酮（PEEK）基质DFMC能够挑战厚截面组件中铝的机械性能，这是热固性复合材料范围之外的应用领域。之前的研究还发现，PEEK DFMC部件在断裂过程中发生纤维严重断裂的可能性要小得多，这表明该材料非常适合通过简单的重塑进行修复，即使用热和压力沿断裂路径沿着重新熔化和固结树脂，使其恢复原始强度和刚度。这提供了一个令人兴奋的修复和回收能力。本文进一步研究了这一点，利用一系列三点弯曲样品加载断裂，然后再加热和加压，然后再次测试。研究了多种再处理方法，包括使用额外材料作为修复包，重新压制以诱导显著流动和简单重塑。这项研究表明，即使发生明显的断裂，复合材料也可以以最小的机械性能损失进行修复。修复包的应用实际上提高了性能，在三次断裂循环后达到约80 GPa的弯曲模量和约900 MPa的最大弯曲应力。© 2021 The Authors.Polymer International由John Wiley & Sons Ltd代表工业化学协会出版。
A major limitation of carbon fibre‐reinforced polymers is their unsuitability for repair and recycling processes due to the common employment of thermoset resin matrices and continuous fibres. Advanced thermoplastic discontinuous fibre moulding compounds (DFMCs) now offer an alternative for high‐performance components. Although DFMCs cannot match the raw performance of continuous fibre reinforcement, compression‐moulding techniques developed at the University of Exeter enable poly(ether ether ketone) (PEEK) matrix DFMCs to challenge the mechanical properties of aluminium in thick‐section components, an application area outside the scope of thermoset composites. This previous research also identified that PEEK DFMC components are far less likely to suffer significant breakage of the fibres during fracture, suggesting that the material is highly suited to repair through simple remoulding, using heat and pressure to re‐melt and consolidate the resin along the fracture path returning it to its original strength and stiffness. This offers an exciting capacity for repair and recyclability. This paper investigates this further, utilising a series of three‐point bending samples loaded to fracture before being reheated and pressurised then tested again. Multiple reprocessing approaches are investigated, including the use of additional material to act as repair packs, re‐pressing to induce significant flow and simple remoulding. This study shows that composites can be repaired with minimal loss of mechanical performance even when significant fracture occurs. The application of repair packs actually increases performance, reaching a flexural modulus ofca80 GPa after three fracture cycles and a maximum bending stress ofca900 MPa. © 2021 The Authors.Polymer Internationalpublished by John Wiley & Sons Ltd on behalf of Society of Industrial Chemistry.