Pokorný Peter, Delgado Sobrino Daynier Rolando, Václav Štefan, Petru Jana, Gołębski Rafał
Institute of Production Technologies, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, Ulica Jána Bottu 25, 917 24 Trnava, Slovakia.
Faculty of Mechanical Engineering, VŠB-Technical University of Ostrava, 70800 Ostrava, Czech Republic.
Materials (Basel). 2023 Feb 9;16(4):1459. doi: 10.3390/ma16041459.
This paper introduces novel research into specific mechanical properties of composites produced by 3D printing using Continuous-Fiber Fabrication (CFF). Nylon (Onyx) was used as the composite base material, while carbon constituted the reinforcement element. The carbon fiber embedment was varied in selected components taking values of 0°, 45°, 90°, and 135° for parts undergoing tensile testing, while one specific part type was produced combining all angles. Carbon-fiber-free components with 100% and 37% fillings were also produced for comparison purposes. Parts undergoing the Charpy impact test had the fibers deposited at angles of 0° and 90°, while one part type was also produced combining the four angles mentioned before. Carbon-fiber-free parts with 100% and 37% fillings were also produced for comparison purposes as with the first part. The Markforged MARK TWO 3D printer was used for printing the parts. These were subsequently scanned in the METROTOM 1500 computed tomography and submitted to the tensile and impact tests. The results showed that adding carbon fiber to the base material increased the volume of defects in the samples as a result of the porosity increase. Although the tensile testing manifested an overall increase in tensile strength Rm of up to 12 times compared to the sample without reinforcement, it was proven that an improper fiber orientation significantly diminished the strength and that combining the four selected angles did not lead to the highest strength values. Finally, the impact tests also showed that fiber-reinforced parts implied up to 2.7 times more work to fracture, and that an improved fiber orientation also led to strength reduction.
本文介绍了对使用连续纤维制造（CFF）的3D打印复合材料特定机械性能的新研究。尼龙（玛瑙石）用作复合基材，而碳构成增强元素。在进行拉伸测试的部件中，碳纤维的嵌入角度在选定部件中有所不同，取值为0°、45°、90°和135°，同时还生产了一种组合所有角度的特定部件类型。为了进行比较，还生产了填充率为100%和37%的无碳纤维部件。进行夏比冲击试验的部件，纤维沉积角度为0°和90°，同时也生产了一种组合上述四个角度的部件类型。与第一种部件一样，为了进行比较，还生产了填充率为100%和37%的无碳纤维部件。使用Markforged MARK TWO 3D打印机打印部件。随后在METROTOM 1500计算机断层扫描仪中对这些部件进行扫描，并进行拉伸和冲击试验。结果表明，由于孔隙率增加，向基材中添加碳纤维会增加样品中的缺陷体积。尽管拉伸试验表明，与未增强的样品相比，拉伸强度Rm总体上提高了多达12倍，但事实证明，纤维取向不当会显著降低强度，并且组合四个选定角度并不会导致最高强度值。最后，冲击试验还表明，纤维增强部件的断裂功最多高出2.7倍，并且改善的纤维取向也会导致强度降低。
