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Numerical Predictions of Bottom Layer Stability in Material Extrusion Additive Manufacturing

  • Solid Freeform Fabrication 2021
  • Published:
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Abstract

Robocasting and 3D concrete printing are technologies that belong under the umbrella term material extrusion additive manufacturing. These two free-form fabrication methods are used to produce 3D structures/components in materials such as ceramic pastes, thermosets, and concrete. Common for the materials is their viscoplastic behavior during deposition and structural buildup (i.e., increase in yield stress) after deposition. The material’s complex nature makes it a non-trivial task to ensures that printed layers do not deform when depositing additional layers on top. In this article, we numerically investigate the influence of the yield stress buildup of viscoplastic materials on the stability of the bottom layer during multilayer printing. Specifically, we have developed a computational flssssuid dynamics model that applies a scalar approach to alter the yield stress. The novel model provides fundamental knowledge on how to design the material’s rheology, so the bottom layer can withstand both the hydrostatic and extrusion pressure.

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Acknowledgements

The authors acknowledge the support from the Danish Council for Independent Research (DFF) | Technology and Production Sciences (FTP) (Contract No. 8022-00042B). Moreover, the authors thank FLOW-3D® for their support regarding licenses.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Technical University of Denmark, 2800, Kgs. Lyngby, Denmark

    Md Tusher Mollah, Raphaël Comminal, Marcin P. Serdeczny, David B. Pedersen & Jon Spangenberg

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  1. Md Tusher Mollah
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  2. Raphaël Comminal
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  3. Marcin P. Serdeczny
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  4. David B. Pedersen
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  5. Jon Spangenberg
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Correspondence to Md Tusher Mollah.

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Mollah, M.T., Comminal, R., Serdeczny, M.P. et al. Numerical Predictions of Bottom Layer Stability in Material Extrusion Additive Manufacturing. JOM 74, 1096–1101 (2022). https://doi.org/10.1007/s11837-021-05035-9

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  • DOI: https://doi.org/10.1007/s11837-021-05035-9

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