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Coupled Simulation of Flow-Induced Viscous and Elastic Anisotropy of Short-Fiber Reinforced Composites

Karl, Tobias; Gatti, Davide

Abstract:
The present work discusses the impact of the back coupling of the fiber orientation distribution on the base flow and on the fiber orientation itself during mold filling simulations. Flows through a channel and over a backward-facing step are investigated. Different closure approximations are considered for modeling the flow induced evolution of anisotropy. Results corresponding to the decoupled approach, in which the effect of fibers on local fluid properties is neglected, build the basis of comparison. The modeling is limited to a laminar, incompressible and isothermal flow of a fiber suspension consisting of rigid short fibers suspended in an isotropic Newtonian matrix fluid. A linear, anisotropic constitutive law is used in combination with a uniform fiber volume fraction of $10\,\%$ and an aspect ratio of $10$. To evaluate the impact of back coupling and of different closure methods in view of the manufactured solid composite the resulting anisotropic elastic properties are investigated based on the Mori-Tanaka method combined with an orientation average scheme. Relative to the range $[0,1]$ the pointwise difference in fiber orientation between the decoupled and the coupled approach is found to be $\pm 5\,\%$ in the channel and $\pm 30\,\%$ in the backward-facing step, respectively. ... mehr

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Zugehörige Institution(en) am KIT Institut für Strömungsmechanik (ISTM)
Institut für Technische Mechanik (ITM)
Publikationstyp Forschungsdaten
Publikationsdatum 24.11.2020
Erstellungsdatum 28.10.2020
Identifikator DOI (KIT): 10.5445/IR/1000126534
KITopen-ID: 1000126534
Lizenz Creative Commons Namensnennung – Nicht kommerziell – Weitergabe unter gleichen Bedingungen 4.0 International
Vorab online veröffentlicht am 20.11.2020
Schlagwörter Short-fiber composites, Coupled molding simulation, Fiber orientation, Flow-induced anisotropic viscosity, Flow-induced anisotropic elasticity
Liesmich

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