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Influence of fiber breakage on flow behavior in fiber length- and orientation-dependent injection molding simulations

Wittemann, Florian ORCID iD icon 1; Kärger, Luise 1; Henning, Frank 1
1 Institut für Fahrzeugsystemtechnik (FAST), Karlsruher Institut für Technologie (KIT)

Abstract:

Injection molding is one of the most important processes for manufacturing discontinuous fiber reinforced
polymers (FRPs). The matrix of FRPs shows a transient chemo-thermomechanical behavior and the fibers create
anisotropy influencing physical properties. Hence, FRPs are complex materials, but also likely used in volume
production. In this work, the fiber-induced anisotropic behavior during mold filling is modelled with an
anisotropic fourth order viscosity tensor. The viscosity tensor takes second and fourth order fiber orientation
tensor, fiber length and non-Newtonian matrix viscosity into account. In this way, the macroscopic simulation
captures the influence of the flow field on the fiber re-orientation and vice versa. The fiber orientation tensor is
used to determine reference fibers in every element for calculation of hydrodynamic forces. This information is
used in a novel fiber breakage model, based on buckling of fibers in Jeffery’s orbit. The result is a macroscopic
molding simulation with not only transient fiber orientation distribution, but also fiber length distribution. Due
to the anisotropic viscosity tensor, the predicted fiber breakage influences the material’s viscosity and flow
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Verlagsausgabe §
DOI: 10.5445/IR/1000152920
Veröffentlicht am 22.11.2022
Originalveröffentlichung
DOI: 10.1016/j.jnnfm.2022.104950
Scopus
Zitationen: 3
Web of Science
Zitationen: 1
Dimensions
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Fahrzeugsystemtechnik (FAST)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 15.11.2022
Sprache Englisch
Identifikator ISSN: 0377-0257
KITopen-ID: 1000152920
Erschienen in Journal of Non-Newtonian Fluid Mechanics
Verlag Elsevier
Band 310
Seiten 104950
Projektinformation MeproSi (DFG, DFG EIN, KA 4224/11-1)
Schlagwörter Discontinuous fiber reinforced polymers, Injection molding simulation, Anisotropic flow, Hydrodynamic forces, Fiber breakage modeling
Nachgewiesen in Web of Science
Scopus
Dimensions
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