Enhancement of binding matrix stiffness in composite filament Co-extrusion additive manufacturing

Chethan Savandaiah, Julia Maurer, Juergen Lesslhumer, Andreas Haider, Georg Steinbichler

Research output: Chapter in Book/Report/Conference proceedingsConference contributionpeer-review

2 Citations (Scopus)


The Flexural modulus and strength are an intrinsic aspect of parts produced via dual matrix composite filament co-extrusion (CFC) based additive manufacturing. In this research work, the main objective is to optimize thermoplastic's (TP) flexural properties by reinforcing it with particulate fillers for CFC printed parts. Accordingly, an effort has been made in this respect and neat Polyamide-6 (PA6) and its composite (PA6.CF) was chosen as a binding matrix for CFC flexural specimens. The PA6 binding matrix is reinforced with particulate carbon fibers (PCF). To improve the compatibility between the PCF and matrix, stearyl titanate coupling agent (1.5 wt. %) was utilized. Constraints such as defects and porosity are of critical attributes and play a vital role in defining the mechanical performance of the 3D printed parts. Herein, the printed specimens were subjected to a non-destructive testing method: micro-computed thermography (μ-CT). PA6 and reinforced PA6 specimen revealed similar porosity and defect volume. Furthermore, the three-point bending test results of 3D printed CFC composite with PA6.CF as a binding matrix showed approx. 46% increase in flexural stiffness and 27% increase in flexural strength when compared to CFC specimens printed with neat PA6 as a binding matrix. In addition, the cryo-fractured fractography of carbon composite filament, an epoxy-based thermo-cured continuous carbon fiber, revealed even distribution of carbon fibers with no visible voids.

Original languageEnglish
Title of host publicationSPE ANTEC 2020
Subtitle of host publicationThe Annual Technical Conference for Plastic Professionals
PublisherSociety of Plastics Engineers (SPE)
Number of pages6
ISBN (Electronic)9781713821182
Publication statusPublished - 2020
EventSPE ANTEC 2020: Annual Technical Conference for Plastic Professionals - Virtual, Online
Duration: 30 Mar 20205 May 2020

Publication series

NameAnnual Technical Conference - ANTEC, Conference Proceedings


ConferenceSPE ANTEC 2020: Annual Technical Conference for Plastic Professionals
CityVirtual, Online


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