Journal Article10.1016/J.ADDMA.2019.05.006
Inter-layer bonding characterisation between materials with different degrees of stiffness processed by fused filament fabrication
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TL;DR: In this paper, the cohesion between the strands of two materials with different stiffness, namely neat PLA and short carbon fibre reinforced PLA (CF-PLA), produced by FFF using advanced fracture mechanical techniques, was investigated.
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Abstract: One of the main benefits of material extrusion additive manufacturing, also known as fused filament fabrication (FFF) or 3D printing, is the flexibility in terms of printing materials. Locally reinforced components can be easily produced by selectively combining reinforced with unfilled tough thermoplastics. However, such multi-material composites usually lack sufficient weld strength in order to be able to withstand operation loads. The present study attempts to close this gap by characterising the cohesion between the strands of two materials with different stiffness, namely neat PLA and short carbon fibre reinforced PLA (CF-PLA), produced by FFF using advanced fracture mechanical techniques. The full set of engineering constants of both materials were obtained under the assumption of transverse isotropy from tensile tests in combination with digital image correlation. Double cantilever beam (DCB) and cracked round bar (CRB) tests were used to determine the critical energy release rate ( G I c ). Both tests were in good correlation with each other and revealed that the interlayer PLA/CF-PLA bonding was at least as tough as the interlayer CF-PLA/CF-PLA bonding.
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Citations
Fused filament fabrication of polymer materials: A review of interlayer bond
TL;DR: In this article, the authors provide a comprehensive understanding of the process-structure-properties of interlayer bond in fused filament fabrication (FFF) technique and provide a review of recent advances on the bond interface in FFF-printed parts in aspects of its mechanisms, characterization and enhancement methods.
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Advances in fused deposition modeling of discontinuous fiber/polymer composites
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TL;DR: In this article, the authors provide a panorama for the recent progress of fused deposition modeling (FDM) technology in the manufacturing of discontinuous fiber reinforced thermoplastic composites and identify the main challenges and outlook for the future development of this 3D printing technology in fiber reinforced composites.
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Mechanical Recyclability of Polypropylene Composites Produced by Material Extrusion-Based Additive Manufacturing
TL;DR: This study focused on the morphological, rheological, thermal, processing, tensile, and impact properties of a promising PP composite in the course of multiple consecutive extrusions as well as the impact of additional heat stabilizers.
Process-induced morphological features in material extrusion-based additive manufacturing of polypropylene
Sandra Petersmann,Petra Spoerk-Erdely,Michael Feuchter,Tom Wieme,Florian Arbeiter,Martin Spoerk +5 more
TL;DR: In this article, the impact of different nozzle temperatures and printing speeds on 3D-printed polypropylene (PP) samples was examined, showing that high nozzle temperature, low printing speed reveals a homogeneous morphology, weak flow-induced orientations, isotropic thermal conductivities and a strong inter-layer diffusion.
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