Valvez Sara, Silva Abilio P, Reis Paulo N B
Department of Electromechanical Engineering, CMAST, University of Beira Interior, 6201-001 Covilhã, Portugal.
Department of Mechanical Engineering, CEMMPRE, University of Coimbra, 3030-194 Coimbra, Portugal.
Polymers (Basel). 2022 Jun 24;14(13):2564. doi: 10.3390/polym14132564.
Fused filament fabrication (FFF) is the most popular additive manufacturing method, which allows the production of highly complex three-dimensional parts with minimal material waste. On the other hand, polyethylene terephthalate glycol (PETG) has been used to replace traditional polymers for 3D printing due to its chemical resistance and mechanical performance, among other benefits. However, when fibres are added, these PETG-based composites can be suitable for many different applications. Nevertheless, to guarantee their good performance in-service in these applications, and even extend to new ones, it is necessary for their mechanical properties to be maximized. Therefore, this study intends to optimize the printing parameters (nozzle temperature, printing speed, layer height and filling) in order to maximize the mechanical properties of printed PETG, PETG+CF (carbon fibre-reinforced PETG composites) and PETG+KF (aramid fibre-reinforced PETG composites). The Taguchi method was used for the experimental procedure design, and the specimens were produced according to the L16 orthogonal array. Finally, an analysis of variance (ANOVA) was performed, with a 95% confidence interval, to analyse the effect of the printing parameters on the bending properties. It was possible to conclude that the best bending properties for PETG, PETG+CF and PETG+KF were obtained for extrusion temperatures of 265 °C, 195 °C and 265 °C, printing speeds of 20, 60 and 20 mm/s, layer heights of 0.4, 0.53 and 0.35 mm and an infill density of 100% for the three materials, respectively.
熔融长丝制造（FFF）是最流行的增材制造方法，它能够以最少的材料浪费生产高度复杂的三维零件。另一方面，聚对苯二甲酸乙二醇酯二醇（PETG）由于其耐化学性和机械性能等优点，已被用于替代传统聚合物进行3D打印。然而，当添加纤维时，这些基于PETG的复合材料可适用于许多不同的应用。尽管如此，为了确保它们在这些应用中的实际使用性能良好，甚至扩展到新的应用，有必要使其机械性能最大化。因此，本研究旨在优化打印参数（喷嘴温度、打印速度、层高和填充率），以最大化打印的PETG、PETG+CF（碳纤维增强PETG复合材料）和PETG+KF（芳纶纤维增强PETG复合材料）的机械性能。采用田口方法进行实验程序设计，并根据L16正交阵列制作试样。最后，进行了方差分析（ANOVA），置信区间为95%，以分析打印参数对弯曲性能的影响。可以得出结论，PETG、PETG+CF和PETG+KF分别在挤出温度为265°C、195°C和265°C，打印速度为20、60和20mm/s，层高为0.4、0.53和0.35mm，填充密度为100%时，获得了最佳弯曲性能。
