Zhang Hao, Zhu Liming, Zhang Fan, Yang Mijia
Institute of Steel and Spatial Structures, College of Civil Engineering & Architecture, Henan University, Kaifeng 475004, China.
Department of Civil and Environmental Engineering, North Dakota State University, Fargo, ND 58108-6050, USA.
Materials (Basel). 2021 Apr 26;14(9):2223. doi: 10.3390/ma14092223.
This paper studies aligned glass fiber-reinforced composites for printing. To determine the influence of fiber content and alignment on the mechanical properties of this novel material, a large number of standard test specimens were prepared, which included samples fabricated by mold-casting, randomly dispersed fiber reinforced mixtures and aligned fiber cement composites containing 10 types of fiber volume ratios manufactured by nozzle sizes ranging of 24 and 10 mm (fiber length = 12 mm). Mechanical properties and failure modes of the specimens under compression and flexural tests were studied experimentally. The anisotropic behaviors of printed samples were analyzed by different loading directions. As a result, the compressive and flexural strength of printed samples showed obvious anisotropy. With the increase of fiber volume ratio, flexural strength of the fiber reinforced composite was elevated tremendously but its compression strength reduced slightly. Moreover, fiber alignment also had a significant influence on the mechanical properties of the fiber reinforced composite. The composite cement-based material with 1 vol.-% aligned fiber exhibited an excellent flexural strength of 9.38 MPa, which increased by 483% in comparison to that of the plain cement paste.
本文研究用于打印的定向玻璃纤维增强复合材料。为了确定纤维含量和取向对这种新型材料力学性能的影响，制备了大量标准测试样本，其中包括通过模铸制造的样本、随机分散纤维增强混合物以及由24毫米和10毫米喷嘴尺寸（纤维长度 = 12毫米）制造的含10种纤维体积比的定向纤维水泥复合材料。通过实验研究了样本在压缩和弯曲测试下的力学性能和失效模式。通过不同加载方向分析了打印样本的各向异性行为。结果表明，打印样本的压缩强度和弯曲强度表现出明显的各向异性。随着纤维体积比的增加，纤维增强复合材料的弯曲强度大幅提高，但其压缩强度略有降低。此外，纤维取向对纤维增强复合材料的力学性能也有显著影响。含1体积%定向纤维的复合水泥基材料表现出9.38兆帕的优异弯曲强度，与普通水泥浆相比提高了483%。
