Li Yongfeng, Ding Qingjun, Zhao Hongyuan, Wu Tingting, Zhang Mingming, Zhang Yaqi
School of Mechanical and Electrical Engineering, Henan Institute of Science and Technology, East of Hualan Road, Xinxiang 453003, China.
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210001, China.
Materials (Basel). 2019 Feb 23;12(4):669. doi: 10.3390/ma12040669.
Anisotropic materials are important functional materials in many fields. The use of these materials is currently being expanded through the rapid development of additive manufacturing. However, there is still no universal method for fabricating two-dimensional anisotropic polymer composites. Here, polylactic acid⁻carbon fiber composites were prepared using the droplet spray method, and their mechanical and friction properties were studied. The tensile strength in the X⁻Y plane perpendicular to the direction of the droplet spray was significantly higher than that in the direction of droplet ejection. Similar trends were observed for the elongation at breaking and the impact strength. The friction coefficient was smallest in the X⁻Y plane. Scanning electron microscopy showed that carbon fibers were oriented in the X⁻Y plane, which enhanced the mechanical and friction properties in this plane.
各向异性材料是许多领域中的重要功能材料。随着增材制造的快速发展，这些材料的应用目前正在不断扩大。然而，目前仍没有制造二维各向异性聚合物复合材料的通用方法。在此，采用液滴喷涂法制备了聚乳酸-碳纤维复合材料，并对其力学性能和摩擦性能进行了研究。在垂直于液滴喷涂方向的X-Y平面内的拉伸强度显著高于液滴喷射方向的拉伸强度。断裂伸长率和冲击强度也观察到类似趋势。摩擦系数在X-Y平面内最小。扫描电子显微镜显示碳纤维在X-Y平面内取向，这增强了该平面内的力学性能和摩擦性能。
