Guessasma Sofiane, Belhabib Sofiane, Nouri Hedi
INRA, UR1268 Biopolymères Interactions Assemblages, F-44300 Nantes, France.
Laboratoire GEPEA, UMR CNRS 6144, Université - IUT de Nantes, avenue du Professeur Jean Rouxel, 44475 Carquefou Cédex, France.
Polymers (Basel). 2019 Jul 22;11(7):1220. doi: 10.3390/polym11071220.
Polyethylene terephthalate glycol (PETG) is a thermoplastic formed by polyethylene terephthalate (PET) and ethylene glycol and known for his high impact resistance and ductility. The printability of PETG for fused deposition modelling (FDM) is studied by monitoring the filament temperature using an infra-red camera. The microstructural arrangement of 3D printed PETG is analysed by means of X-ray micro-tomography and tensile performance is investigated in a wide range of printing temperatures from 210 °C to 255 °C. A finite element model is implemented based on 3D microstructure of the printed material to reveal the deformation mechanisms and the role of the microstructural defects on the mechanical performance. The results show that PETG can be printed within a limited range of printing temperatures. The results suggest a significant loss of the mechanical performance due to the FDM processing and particularly a substantial reduction of the elongation at break is observed. The loss of this property is explained by the inhomogeneous deformation of the PETG filament. X-ray micro-tomography results reveal a limited amount of process-induced porosity, which only extends through the sample thickness. The FE predictions point out the combination of local shearing and inhomogeneous stretching that are correlated to the filament arrangement within the plane of construction.
聚对苯二甲酸乙二醇酯二醇（PETG）是一种由聚对苯二甲酸乙二醇酯（PET）和乙二醇形成的热塑性塑料，以其高抗冲击性和延展性而闻名。通过使用红外热像仪监测长丝温度，研究了PETG在熔融沉积成型（FDM）中的可打印性。借助X射线显微断层扫描分析了3D打印PETG的微观结构排列，并在210℃至255℃的广泛打印温度范围内研究了拉伸性能。基于打印材料的3D微观结构建立了有限元模型，以揭示变形机制以及微观结构缺陷对力学性能的作用。结果表明，PETG可以在有限的打印温度范围内进行打印。结果表明，由于FDM加工，力学性能有显著损失，特别是观察到断裂伸长率大幅降低。这种性能的损失是由PETG长丝的不均匀变形所解释的。X射线显微断层扫描结果显示，加工诱导的孔隙率有限，仅贯穿样品厚度。有限元预测指出了局部剪切和不均匀拉伸的组合，这与构建平面内的长丝排列相关。
