The Dynamic Behavior of a Concentrated Non-Brownian Glass Fiber Suspension in Simple Shear Flow

Eberle, Aaron P. R.; Velez, Gregorio; Baird, Donald G.; Wapperom, Peter; Ortman, Kevin

doi:10.1063/1.2964823

Cited by 6 publications

(6 citation statements)

References 2 publications

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“…The hole diameter varied slightly, 23.8 ± 0.5 mm and was accounted for in calculating the stresses for each run. A comprehensive analysis and description of the donut sample can be found elsewhere [16,17].…”

Section: Rheological Measurementsmentioning

confidence: 99%

“…We do note, however, that the stress growth experiments used in the comparison were performed in a rotational rheometer with parallel disk geometry in which there is a varying shear rate from the center of the plates to the rim. Recent results have suggested that the inhomogeneous shear field in the parallel disk geometry induces excessive fiber-fiber interaction in concentrated fiber suspensions which can have a severe effect on the magnitude of the stress growth overshoot peak and width of the overshoot [16,17].…”

Section: Introductionmentioning

confidence: 99%

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Fiber orientation kinetics of a concentrated short glass fiber suspension in startup of simple shear flow

Eberle¹,

Vélez‐García

Baird³

et al. 2010

Journal of Non-Newtonian Fluid Mechanics

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Section: Rheological Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fiber orientation kinetics of a concentrated short glass fiber suspension in startup of simple shear flow

Eberle¹,

Vélez‐García

Baird³

et al. 2010

Journal of Non-Newtonian Fluid Mechanics

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“…A new set of model parameters was determined by fitting model predictions from rheometrical simulations to orientation data measured on the sheared "donut" sample data of Eberle (2008) assuming that steady state was reached at γ = 50. It should be noticed that γ = 50, is the strain where the orientation data begins to level off.…”

Section: Evolution Of Fiber Orientation and Model Parametersmentioning

confidence: 99%

Simulation of Injection Molding Using a Model with Delayed Fiber Orientation

Vélez‐García

Mazahir

Wapperom

et al. 2011

International Polymer Processing

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Delay in fiber orientation evolution based on the Folgar-Tucker model with a slip parameter correction has been proposed as a simple alternative to improve predictions of fiber orientation in injection molded parts. Predictions based on this model and model parameters fitted to data from simple shear experiments were compared with experimentally determined fiber orientation in a center-gated disk. Three methods of fitting to simple shear data were assessed to obtain the isotropic diffusivity and the slip parameter. The model parameters and orientation data evaluated at the entry, lubrication and nearend-of fill regions in a center-gated disk for 30 wt% short glass fiber-filled polybutylene terephtalate (PBT) were obtained from earlier efforts in our laboratory. Simulation results based on the Folgar-Tucker model with the slip correction using customarily assumed inlet orientation being random and experimentally measured at the gate disagreed with measured orientation values at certain positions along the disk. However, improvement in the prediction of orientation due the slip correction was found at the core and transition layers in the lubrication region. The use of inlet conditions washes out quickly in the absence of the slip correction and induced a general reduction of orientation towards the center of the sample causing underestimation of orientation at the entry and lubrication region. Model predictions combining the slip correction and experimentally determined orientation at the gate are in agreement with the experimental data for the core layers near the end-of-fill region.

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“…That said, the literature devoted to experimental studies of the rheology of pulp fibres in reinforced polymer composites is very restricted. This is likely due to the complex nature of these materials, the difficulties encountered during their processing as well as the difficulty of characterizing them rheologically [19]- [25].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Influence of Fibre Aspect Ratio and Fibre Content on the Rheological Characteristic of High Yield Pulp Fibre Reinforced Polyamide 11 “HYP/PA11” Green Composite

Cherizol

Sain²,

Tjong³

2015

OJPChem

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The rheological behavior of composites made with low-density polyamide 11 (PA11) and high yield pulp fibre (HYP) is evaluated. The rheological properties of high-yield, pulp-reinforced biobased Nylon 11 HYP/PA11 composite were investigated using a capillary rheometer. The rheological tests were realized in function of the shear rate for different temperature conditions. The experimental results showed that identically for fibre content and aspect ratio, the shearing effects decreased as the temperature increased; that is, the HYP/PA11 became more non-Newtonian in the higher temperature region, which corresponds to the high pseudoplasticity of the HYP/PA11. At low HYP content, the shear viscosity is expected to increase rapidly with increasing concentrations of the fibres because of the rapidly increasing interactions between particles as they become more closely packed. However, at very high fibre content, random anisotropic structure of the fibres in polymer melts is created. The increase in shear viscosity is greater at lower shear rates, where fibre and polymer molecules are not completely oriented.

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The Dynamic Behavior of a Concentrated Non-Brownian Glass Fiber Suspension in Simple Shear Flow

Cited by 6 publications

References 2 publications

Fiber orientation kinetics of a concentrated short glass fiber suspension in startup of simple shear flow

Fiber orientation kinetics of a concentrated short glass fiber suspension in startup of simple shear flow

Simulation of Injection Molding Using a Model with Delayed Fiber Orientation

Evaluation of the Influence of Fibre Aspect Ratio and Fibre Content on the Rheological Characteristic of High Yield Pulp Fibre Reinforced Polyamide 11 “HYP/PA11” Green Composite

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