Tensile Mechanical Properties of Polypropylene Composites Fabricated by Material Extrusion

dc.creatorWatanabe, Narumi
dc.creatorShofner, Meisha L.
dc.creatorRosen, David W.
dc.date.accessioned2021-11-02T19:14:06Z
dc.date.available2021-11-02T19:14:06Z
dc.date.issued2017
dc.description.abstractIn the material extrusion additive manufacturing process, a thin filament of material is deposited in a layer-by-layer manner to fabricate a three dimensional part. The filament deposition pattern can result in voids and incomplete bonding between adjacent filaments in a part, which leads to reduced mechanical properties. Further, the layer-by-layer deposition procedure typically results in mechanical property anisotropy, with higher properties in the layer compared to those across layers. The study reported in this paper explored various polypropylene composite formulations to address these issues: low residual stress and warpage, good mechanical properties, and reduced anisotropy. The reduction in anisotropy will be the focus of this paper as a function of thermal properties and process variable settings. A series of process simulation models was developed to explore ranges of thermal properties and process settings, which provided insights into tensile specimen behaviors. Results demonstrate that anisotropy can be reduced almost completely if the material can be formulated to have low crystallinity, low coefficient of thermal expansion, and moderate to high thermal conductivity (for a polymer).en_US
dc.description.departmentMechanical Engineeringen_US
dc.identifier.urihttps://hdl.handle.net/2152/89869
dc.language.isoengen_US
dc.publisherUniversity of Texas at Austinen_US
dc.relation.ispartof2017 International Solid Freeform Fabrication Symposiumen_US
dc.rights.restrictionOpenen_US
dc.subjectpolypropylene compositesen_US
dc.subjectmaterial extrusionen_US
dc.subjectadditive manufacturingen_US
dc.subjecttensile propertiesen_US
dc.subjectprocess simulationen_US
dc.titleTensile Mechanical Properties of Polypropylene Composites Fabricated by Material Extrusionen_US
dc.typeConference paperen_US

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