Long fibre-reinforced thermoplastic or long fibre thermoplastic (LFT) composites possess superior specific modulus and strength, excellent impact resistance, and other advantages such as ease of processability, recyclability, and excellent corrosion resistance. These advantages make LFT composites one of the most advanced lightweight engineering materials and enable their increasing use in various applications. This review paper summarises the research and development work that has been conducted on LFT composites since their initial development. Different aspects of LFTs, such as process development, fibre orientation distribution (FOD), fibre length distribution (FLD), and their effects on the mechanical properties of LFT composites are described. The characterisation of the FOD and FLD in the LFT composites using advanced imaging technology such as highresolution 3D micro-CT scanning technique is summarised. Research and development of LFT hybridisation and LFT additives are also discussed. Finally, conclusions are made and the future outlook of LFT composites is given.. ARTICLE HISTORY Received 8 August 2018 Accepted 15 February 2019

中文翻译：

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长纤维增强热塑性塑料或长纤维热塑性塑料 (LFT) 复合材料综述

长纤维增强热塑性塑料或长纤维热塑性塑料 (LFT) 复合材料具有优异的比模量和强度、优异的抗冲击性以及其他优点，例如易于加工、可回收和优异的耐腐蚀性。这些优势使 LFT 复合材料成为最先进的轻质工程材料之一，并使其越来越多地用于各种应用。这篇综述总结了 LFT 复合材料自最初开发以来的研究和开发工作。描述了 LFT 的不同方面，例如工艺开发、纤维取向分布 (FOD)、纤维长度分布 (FLD) 及其对 LFT 复合材料机械性能的影响。总结了使用高分辨率 3D 显微 CT 扫描技术等先进成像技术对 LFT 复合材料中 FOD 和 FLD 的表征。还讨论了 LFT 杂交和 LFT 添加剂的研究和开发。最后，得出结论并给出 LFT 复合材料的未来展望。 文章历史 2018 年 8 月 8 日收到 2019 年 2 月 15 日接受