Numerical Predictions of Bottom Layer Stability in Material Extrusion Additive Manufacturing

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dc.creatorMollah, Tusher
dc.creatorComminal, Raphaël
dc.creatorSerdeczny, Marcin P.
dc.creatorPederson, David B.
dc.creatorSpangenberg, Jon
dc.date.accessioned2021-12-07T17:29:35Z
dc.date.available2021-12-07T17:29:35Z
dc.date.issued2021
dc.description.abstractRobocasting 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 nontrivial task to ensure that printed layers do not deform when depositing additional layers on top. In this paper, 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 fluid 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.en_US
dc.description.departmentMechanical Engineeringen_US
dc.identifier.urihttps://hdl.handle.net/2152/90731
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/17650
dc.language.isoengen_US
dc.publisherUniversity of Texas at Austinen_US
dc.relation.ispartof2021 International Solid Freeform Fabrication Symposiumen_US
dc.rights.restrictionOpenen_US
dc.subjectyield stressen_US
dc.subjectlayer stabilityen_US
dc.subjectviscoplastic materialsen_US
dc.subjectmultilayer printingen_US
dc.subjectnumerical modelingen_US
dc.titleNumerical Predictions of Bottom Layer Stability in Material Extrusion Additive Manufacturingen_US
dc.typeConference paperen_US

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2021 International Solid Freeform Fabrication Symposium