Lu Yue, Han Xiao Xiao, Gleadall Andrew, Zhao Li-Guo
Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, United Kingdom.
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Hunan, China.
3D Print Addit Manuf. 2022 Aug 1;9(4):278-287. doi: 10.1089/3dp.2020.0310. Epub 2022 Aug 3.
Additive manufacturing of fiber-reinforced polymers is one of the latest technical developments in composites manufacturing. However, there is a severe shortage of research into continuous fiber-reinforced polymers manufactured through stereolithography. For the first time, this article investigates the fracture properties of continuous carbon fiber-reinforced polymer produced by three-dimensional stereolithography printing. Compact tension (CT) specimens, both plain and fiber reinforced, were produced and tested systematically. The results showed a significant improvement in fracture toughness for fiber-reinforced specimens when compared with plain ones. The positioning of fiber bundles had a substantial effect on fracture properties, and a higher fracture toughness was reported for specimens with the fiber bundle placed closer to the crack tip. By increasing the number of fiber bundles, a significant increase in fracture toughness was reported when compared with the sample with a single fiber bundle, indicating a strong contribution of fiber volume. Also, the contribution appeared to be most effective when the fiber bundles were placed symmetrically in the thickness direction. The study is of importance and value for the development of the stereolithography technique in manufacturing continuous fiber-reinforced composites with enhanced mechanical properties.
纤维增强聚合物的增材制造是复合材料制造领域的最新技术发展之一。然而，对于通过立体光刻制造的连续纤维增强聚合物的研究严重不足。本文首次研究了通过三维立体光刻印刷生产的连续碳纤维增强聚合物的断裂性能。制备了普通和纤维增强的紧凑拉伸（CT）试样，并进行了系统测试。结果表明，与普通试样相比，纤维增强试样的断裂韧性有显著提高。纤维束的位置对断裂性能有重大影响，对于纤维束靠近裂纹尖端的试样，其断裂韧性更高。通过增加纤维束的数量，与单纤维束试样相比，断裂韧性显著提高，表明纤维体积有很大贡献。此外，当纤维束在厚度方向对称放置时，这种贡献似乎最为有效。该研究对于立体光刻技术在制造具有增强机械性能的连续纤维增强复合材料方面的发展具有重要意义和价值。
