Characterizing Internal Porosity of 3D-Printed Fiber Reinforced Materials

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dc.creatorMattingly, Frye L.
dc.creatorFranc, Alan
dc.creatorKunc, Vlastimil
dc.creatorDuty, Chad
dc.date.accessioned2021-12-01T23:38:42Z
dc.date.available2021-12-01T23:38:42Z
dc.date.issued2021
dc.description.abstractAs the functional requirements for 3D printed parts become more demanding, the use of fiber reinforced materials in material extrusion printers is increasingly common. Although fiber-reinforced thermoplastics offer higher stiffness and strength, the internal volume of the extruded material often has a high degree of porosity which can negatively impact mechanical properties. This research surveys the internal porosity present across a range of material extrusion additive manufacturing platforms, primarily those involving a single screw extruder, such as the Big Area Additive Manufacturing (BAAM) system. The porosity within the volume of an extruded bead was quantified through image analysis of cross sectional micrographs. The impact of extrusion rate, transient vs steady state flow, multiple hardware configurations, and material conditions were evaluated. Across the five systems studied porosities ranged from 0.1% to 18.4% with the greatest reductions in porosity coming from two systems that added a vent to the extruder barrel which lowered porosity 64% in one case and 98% in the other.en_US
dc.description.departmentMechanical Engineeringen_US
dc.identifier.urihttps://hdl.handle.net/2152/90659
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/17578
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.subjectinternal porosityen_US
dc.subjectfiber reinforced materialsen_US
dc.subject3D printingen_US
dc.subjectbig area additive manufacturingen_US
dc.subjectBAAMen_US
dc.titleCharacterizing Internal Porosity of 3D-Printed Fiber Reinforced Materialsen_US
dc.typeConference paperen_US

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2021 International Solid Freeform Fabrication Symposium