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.

中文翻译：

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连续碳纤维增强三维立体光刻印刷聚合物的断裂韧性

纤维增强聚合物的增材制造是复合材料制造的最新技术发展之一。然而，对通过立体光刻制造的连续纤维增强聚合物的研究严重缺乏。本文首次研究了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。系统地生产和测试了普通和纤维增强的紧凑拉伸 (CT) 样本。结果表明，与普通样品相比，纤维增强样品的断裂韧性显着提高。纤维束的定位对断裂性能有很大影响，据报道，纤维束靠近裂纹尖端的样品具有更高的断裂韧性。通过增加纤维束的数量，与单纤维束的样品相比，断裂韧性显着增加，表明纤维体积的巨大贡献。此外，当纤维束沿厚度方向对称放置时，这种贡献似乎最有效。该研究对于发展立体光刻技术制造具有增强机械性能的连续纤维增强复合材料具有重要意义和价值。