Konstitutive Charakterisierung von Kautschukmischungen mit dem Hochdruckkapillarviskosimeter

Proc Appl Math and Mech

Eberhardsteiner

Hofstetter

2006

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The goal of this contribution is the identification of the interaction of the typical swelling behaviour of viscoelastic fluids and the viscosity of the investigated rubber blends in the context of an extrusion process. By adaptation the fitness equation of the used genetic algorithm it is possible to study the influence of the die swell on viscous properties. With this knowledge a more realistic simulation of the die swell phenomenon and its influence on the resulting profile geometry is possible.

Section: Numerical Simulation Of the Die Swell Phenomenonsupporting

confidence: 63%

Section: Materials Characterisation For Rubber Blendsmentioning

confidence: 99%

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Viscosity Characterisation for Rubber Blends from Die Swell Data by means of a Genetic Algorithm

Proc Appl Math and Mech

Eberhardsteiner

Hofstetter

2006

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“…A successful validation for this characterization method based on a genetic algorithm is summarized in Ref. 1.…”

Section: Rheological Characterizationmentioning

confidence: 99%

“…Although rubber compounds have similar rheological behavior, the methods for the material characterization of polymers are not always applicable for rubber compounds 1. The goal of this study is to use common polymer methods for the characterization of the die swell phenomenon of rubber compounds without introducing new empiric material parameters.…”

Section: Introductionmentioning

confidence: 99%

Back‐calculation of the die swell phenomenon of rubber compounds by means of torsional rheometry

J of Applied Polymer Sci

Ernst²,

Eberhardsteiner

2008

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The die swell phenomenon of capillary experiments with various ratios of length to diameter of capillary dies is investigated. This knowledge is important for the design of injection heads for the extrusion of rubber profiles. To predict the die swell of capillary experiments, additional tests with a torsional rheometer has been performed. For polymers, the combination of such rheological data is possible under usage of the empirical relationship by Cox and Merz. With the introduction of a scaling factor this rule is also applicable for rubber compounds. With the relationship of Laun and the new scaling factor a back‐calculation of the first normal stress difference is done. Finally, the die swell of arbitrary capillary experiments for industry‐used rubber compounds can be computed without introduction of new material parameters. For this task a relationship of Tanner is used, which connects the die swell and the first normal stress difference. An adaptation of the capillary viscometer allows the experimental investigation of the die swell and, thus, a validation of the presented approach. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

Experimental validation of a viscoelastic material model for numerical simulation of the extrusion process of rubber blends

Proc Appl Math and Mech

Wieczorek²,

Petracek

et al. 2007

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The goal of this contribution is the validation of a viscoelastic material model, which allows consideration of the interaction of the typical swelling behavior of viscoelastic fluids and the shear rate dependent viscosity of industrial used rubber blends in the context of an extrusion process. With this knowledge more realistic numerical simulations of the die swell phenomenon and its influence on the resulting profile geometry are possible.