Study on the Fracture Toughness of 3D Printed Engineering Plastics

• Published in: Journal of materials engineering and performance 2022-04, Vol.31 (4), p.2889-2895
• Main Authors: Yang, Yang, Liu, Ye, Hao, Wenfeng, Guo, Guangping, Cheng, Xinwen
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion and Coatings; Engineering Design; Materials Science; Quality Control; Reliability; Safety and Risk; Tribology
• ISSN: 1059-9495; 1544-1024
• DOI: 10.1007/s11665-021-06439-z

Using polylactic acid (PLA), polyamide (PA) and glass fiber–reinforced polyamide (GF/PA) as raw materials, samples with different printing temperature and speed were prepared. PLA samples were prepared by fused deposition modeling, and PA and PA/GF samples were prepared by selective laser sintering. The fracture toughness of 3D printed engineering plastics was characterized by three-point bending test. The results show that the process parameters have little effect on the fracture toughness of the specimen. With the change of printing temperature or speed, the fracture toughness of the specimen decreases by 4.9%. The raw materials have great influence on the fracture toughness of the specimens. The fracture toughness of PLA increases by 27.95% compared with PA and 58.71% with GF/PA. The results show that the fracture toughness of PLA is the highest among the three materials. Finally, the fracture surface of the specimen was scanned by scanning electron microscope, and the fracture microstructure was analyzed to reveal the influence of process parameters and raw materials on the fracture toughness of 3D printed engineering plastics.