Mode I, mode II and mixed mode I-II delamination of carbon fibre-reinforced polyamide composites 3D-printed by material extrusion

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Abstract

Continuous carbon fibres can greatly improve the properties of 3D-printed polymer parts made by material extrusion. However, like all laminated composites, 3D-printed parts are susceptible to delamination damage. In addition, the printing process does not include a consolidation at high temperatures and pressure, unlike conventional manufacturing methods, which can lead to poor interlayer cohesion. Due to the combination of the susceptibility to delamination and a weak interface, the assessment of the interlaminar properties of 3D-printed parts is critical. This work experimentally investigates the delamination behaviour of carbon fibre-reinforced polyamide laminates under mode I, mode II and mixed mode I-II loading, using the double cantilever beam (DCB), end-loaded split (ELS), end-notched flexure (ENF) and mixed-mode bending (MMB) tests. An interlaminar fracture toughness at crack initiation of 1.5 kJ/m2 was found in mode I, 2.1 (ELS) and 1.8 (ENF) kJ/m2 in mode II, and 1.0 kJ/m2 in mixed mode I-II with GII/Gtotal = 0.5. Several analytical and numerical models are employed to validate the experimental results. Scanning electron microscopy revealed the micro-mechanical origins of the crack in the different loading configurations.
Original languageEnglish
Article number107655
Number of pages12
JournalComposites Part A: Applied Science and Manufacturing
Volume173
Issue numberMarch
DOIs
Publication statusPublished - Oct 2023

Bibliographical note

Funding Information:
This work was supported by the Agency for Innovation and Entrepreneurship Flanders via the Strategic Initiative Materials NANOFORCE research program: projects RELFICOM and PET2VALUE.

Publisher Copyright:
© 2023 Elsevier Ltd

Copyright:
Copyright 2023 Elsevier B.V., All rights reserved.

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