Improving the Mechanical Properties of Continuous Fiber Reinforced Thermoplastic Composites Manufactured by FDM Method with Fiber Ratio Optimization

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Uşun A., Vatandaş B. B., Gümrük R.

6. INTERNATIONAL SCIENCES AND INNOVATION CONGRESS, Ankara, Turkey, 25 February - 26 March 2023, pp.223-231

  • Publication Type: Conference Paper / Full Text
  • City: Ankara
  • Country: Turkey
  • Page Numbers: pp.223-231
  • Karadeniz Technical University Affiliated: Yes


It has been possible to produce parts with high mechanical properties by printing continuous fiber-reinforced thermoplastic composites (CFRTP) in the fused deposition modeling (FDM) method. However, the mechanical properties of the produced parts are limited due to the hereditary problems of the FDM method, such as weak interlayer strength, porosity, and constraints of the matrices that can be used. In order to improve CFRTP printing and compete with thermoset composites, various studies such as optimization of printing parameters, application of pre-heating to the previous layer, application of force with the print head, etc., have been made in the literature to increase the strength between layers. In this study, the fiber ratio of CFRTP materials was optimized, and the print quality was improved by coding an infrared heater. In order to obtain high mechanical properties, CFRTP filaments with homogeneous fiber-polymer distribution were produced first. As a result, it was found that a %50 fiber volume ratio value is optimum in CFRTP filaments. In addition, an infrared heater was used during printing. This infrared heater is placed on a rotating system and constantly remains in the direction the nozzle is
advancing. In this way, the area to be printed is exposed to a pre-heating with an infrared heater. As a result, the interlayer strength value increases as the new filament bonds better with the pre-heated substrate. Then, the mechanical properties of the obtained parts were examined by a three-point bending test, and a maximum bending strength of 1383 MPa was obtained.