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Mechanical characterization and asymptotic homogenization of 3D-printed continuous carbon fiber-reinforced thermoplastic

  • Thiago Assis DutraEmail author
  • Rafael Thiago Luiz Ferreira
  • Hugo Borelli Resende
  • Alessandro Guimarães
Technical Paper
  • 144 Downloads

Abstract

The present work investigates the mechanical properties of continuous carbon fiber-reinforced thermoplastic by testing composite specimens which were manufactured using an innovative process based on the fused filament fabrication (FFF, analogous to FDM®). The adopted testing procedures and their results are presented, as well as an introduction to the manufacturing process, which is patented by Markforged Inc. The experimental mechanical properties (stiffness and strength) of the composite specimens, measured in tensile (longitudinal and transverse), compression (longitudinal) and in-plane shear are reported. The asymptotic homogenization technique is applied in order to predict the elastic mechanical properties of the carbon fiber-reinforced lamina. In contrast to recent studies, this investigation has revealed that considering Nylon as the thermoplastic matrix embedding the continuous fiber consistently underpredicts the transverse and in-plane shear elastic properties of the reinforced laminae. These results suggest that the composition of the thermoplastic resin is not exactly the same for the unreinforced and reinforced filaments. Additionally, cross-sectional micrographs of specimens are analyzed in detail and considerable insight has been gained concerning the thermoplastic resin of reinforced filaments.

Keywords

3D printing of composite materials Continuous carbon fiber Experimental characterization Asymptotic homogenization 

Notes

Acknowledgements

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brasil (CAPES) - Finance Code 001 (Grant from Process CAPES-PROEX 88882.180843/2018-01), Grant 2015/00159-5 São Paulo Research Foundation (FAPESP), Instituto de Pesquisas Tecnológicas do Estado de São Paulo SA - IPT and by the Fundação de Apoio ao Instituto de Pesquisas Tecnológicas do Estado de São Paulo - FIPT (Grant from Programa Novos Talentos).

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  • Thiago Assis Dutra
    • 1
    • 2
    Email author
  • Rafael Thiago Luiz Ferreira
    • 1
  • Hugo Borelli Resende
    • 1
  • Alessandro Guimarães
    • 2
  1. 1.GPMA - Research Group on Additive ManufacturingITA - Instituto Tecnológico de AeronáuticaSão José dos CamposBrazil
  2. 2.LEL - Lightweight Structures LaboratoryIPT - Instituto de Pesquisas TecnológicasSão José dos CamposBrazil

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