The Effect of Peek Polymer and Carbon Fiber Interface Interaction on the Mechanical Behavior of Additively Manufactured Continuous Fiber Reinforced Composites

Vatandaş B. B. , Uşun A., Gümrük R.

4. INTERNATIONAL GÖBEKLİTEPE SCIENTIFIC RESEARCH CONGRESS, Şanlıurfa, Turkey, 7 - 08 October 2022, pp.1043-1050

  • Publication Type: Conference Paper / Full Text
  • City: Şanlıurfa
  • Country: Turkey
  • Page Numbers: pp.1043-1050
  • Karadeniz Technical University Affiliated: Yes


Continuous fiber-reinforced thermoplastic composite (CFRTP) manufacturing with fused deposition modeling (FDM) platform is an up-and-coming method to produce parts with high mechanical properties. Mechanical performance of CFRTP is still limited by interlayer bonding performance and fiber-matrix interface. In this study, CFRTP samples were produced using carbon fiber and PEEK thermoplastic, and it was aimed to improve the mechanical properties by developing a more suitable fiber-polymer interface. The sizing process has been applied to the fiber in order to ensure that the applied force is transferred to the fibers more efficiently, with the polymer holding onto the fiber surface more firmly. In the sizing process, a production method was applied in the form of cleaning the fiber surfaces, activation with Meldrum acid, and completing the sizing by using PEKK powder. CFRTP filament was produced using the fibers coated with the sizing agent in the melt impregnation method. Three-point bending test specimens were produced by using the obtained filaments on an FDM-based printer. When the results were examined, it was observed that the maximum stresses obtained from the three-point bending test were 9.72%, and the elasticity modulus improved by 56.76%. An average of 974.75 MPa flexural strength and 166.97 GPa modulus of elasticity were obtained in sizing applied samples. The stages of the sizing process and its effects on the fiber were examined using SEM images.