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Continuous rheological description of highly filled polymer melts for material extrusion

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dc.title Continuous rheological description of highly filled polymer melts for material extrusion en
dc.contributor.author Filip, Petr
dc.contributor.author Hausnerová, Berenika
dc.contributor.author Hnátková, Eva
dc.relation.ispartof Applied Materials Today
dc.identifier.issn 2352-9407 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2020
utb.relation.volume 20
dc.type article
dc.language.iso en
dc.publisher Elsevier Ltd
dc.identifier.doi 10.1016/j.apmt.2020.100754
dc.relation.uri https://www.sciencedirect.com/science/article/pii/S2352940720302006
dc.subject Flow performance en
dc.subject Highly filled melts en
dc.subject Master curve en
dc.subject Material extrusion en
dc.subject True viscosity en
dc.description.abstract In additive manufacturing based on the material extrusion of filled polymer melts, a correct description of the rheological behaviour of the processed material is an important requirement. In case of highly filled feedstocks, complexities connected with a proper flow description are not only caused by the high packaging of powder particles (more than 50 vol.%) but also by the notable participation of polymer binder components in the quantification of shear viscosity. In this study, analytical expressions (master curves) of a true shear viscosity are developed to follow and continuously optimize the rheological dependence of the bulk feedstock on particular variables. A nickel-chromium-based compound (Inconel 718, content 59 vol.%) with thermoplastic binders of different molecular weight of polyethylene glycol was selected for the case study. The proposed master curves comprise simultaneously hitherto separately applied two corrections of an apparent shear viscosity: regarding the different capillary geometries with respect to entrance pressure and outlet extension, and determining an actual velocity profile based on shear rate distribution inside a feedstock. This approach eliminates the hitherto used non-Newtonian index, by means of which the logarithmic derivative was approximated. As the master curves depend exclusively on the shear rate and molecular weight of polyethylene glycol and do not involve any adjustable parameter, their application is straightforward. Their accuracy does not exceed experimental errors. © 2020 en
utb.faculty Faculty of Technology
utb.faculty University Institute
dc.identifier.uri http://hdl.handle.net/10563/1009800
utb.identifier.scopus 2-s2.0-85087509428
utb.source j-scopus
dc.date.accessioned 2020-07-29T07:30:39Z
dc.date.available 2020-07-29T07:30:39Z
utb.ou Department of Production Engineering
utb.ou Centre of Polymer Systems
utb.contributor.internalauthor Hausnerová, Berenika
utb.contributor.internalauthor Hnátková, Eva
utb.fulltext.sponsorship The author (P.F.) wishes to acknowledge the Czech Science Foundation for the financial support under Grant Project No. 17-26808S . The work was supported (B.H., E.H.) by the Ministry of Education, Youth and Sports of the Czech Republic—Program NPU I (LO1504).
utb.scopus.affiliation Institute of Hydrodynamics, Czech Academy of Sciences, Pod Patankou 5, Prague, 166 12, Czech Republic; Department of Production Engineering, Faculty of Technology, Tomas Bata University in Zlín, Vavreckova 275, Zlín, 760 01, Czech Republic; Centre of Polymer Systems, University Institute, Tomas Bata University in Zlín, Trida T. Bati 5678, Zlín, 760 01, Czech Republic
utb.fulltext.projects 17-26808S
utb.fulltext.projects LO1504
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