Applying the finite-element method to determine the die swell phenomenon during the extrusion of glass rods with non-circular cross-sections

Mayer, H.-J.; Stiehl, Chr.; Roeder, E.

doi:10.1016/s0924-0136(97)00053-8

Cited by 11 publications

(4 citation statements)

References 3 publications

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“…This can be attributed to full development of the polymer fl ow. Moreover, the die swell is higher in square-shaped dies than circular dies (Mayer et al ., 1997). While in square-shaped slots the swelling takes place equally in both directions (i.e.…”

Section: Modeling Of Polymer Fl Ow Inside the Spinneretmentioning

confidence: 99%

Melt spinning of synthetic polymeric filaments

Rawal

Mukhopadhyay

2014

Advances in Filament Yarn Spinning of Textiles and Polymers

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Section: Modeling Of Polymer Fl Ow Inside the Spinneretmentioning

confidence: 99%

Melt spinning of synthetic polymeric filaments

Rawal

Mukhopadhyay

2014

Advances in Filament Yarn Spinning of Textiles and Polymers

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“…An approximate method based on an inputted wall slipping velocity at the die exit was used to quantify the effect of friction. In another study of die swell for noncircular cross sections, both no‐slip and full slip were implemented into a computational scheme for a viscosity of 10 6.86 Pa·s.…”

Section: Introductionmentioning

confidence: 99%

Computational Modeling of Die Swell of Extruded Glass Preforms at High Viscosity

et al. 2014

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Computational simulations of glass extrusion are performed to quantify the effects of material behavior and slip at the die/ glass interface on the die swell. Experimental data for three glass types are used to guide the computational study, which considers glass material to be viscous with and without shear thinning and viscoelastic using the Maxwell upper-convected model. The study starts with assuming no-slip at the glass/die interface to see if material behavior alone can explain the die swell results, and then considers slip using the Navier model where interface shear is directly proportional to the relative slip speed at the interface. Consistent with the possibility of slip and intended high viscosity applications, viscosity ranging from 10 7.4 -10 8.8 PaÁs was used. Based on optimization of the various input parameters required to achieve the measured die swell and ram force values, the study concludes that interface slip occurred as only extreme values of the shear thinning parameters provided an alternative.

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“…Indeed, no deformation due to gravity, that is, slenderness, was considered since it could be sufficiently controlled if the temperature inside the die is kept around the softening point of the specific glass, thus by extruding at high viscosities. The complex phenomenon of die swelling, that is, the enlargement of the extrudate's shape after the passage through the die, carefully modeled by Mayer et al 61 and subsequently by Trabelssi et al, 41 was also neglected in the present work. Although the swelling effect cannot be removed at all but simply limited by reducing the friction at the glass/die interface, it does not significantly influence the flow inside the die but causes a dimensional growth of the features of the glass preform.…”

Section: T a B L Ementioning

confidence: 99%

Toward the fabrication of extruded microstructured bioresorbable phosphate glass optical fibers

Gallichi-Nottiani

Pugliese

Boetti

et al. 2019

Int J of Appl Glass Sci

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The steps toward the fabrication of directly extruded microstructured fiber preforms made of a bioresorbable phosphate glass are herein presented, analyzing the features of the process from the glass synthesis to the manufacturing of the fiber. The realization of these fibers leverages on three main pillars: an optically transparent bioresorbable glass, its extrusion into a preform, and the fiber drawing. The glass has been designed and carefully prepared in our laboratory to be dissolvable in a biological fluid while being optically transparent and suitable for both preform extrusion and fiber drawing. To support the production of an optimized die for the preform extrusion, a simplified laminar flow model simulation has been employed. This model is intended as a tool for a fast and reliable way to catch the complex behavior of glass flow during each extrusion and can be regarded as an effective design guide for the dies to fulfill the specific needs for preform fabrication. After die optimization, extrusion of a capillary was realized, and a stacking of extruded tubes was drawn to produce a microstructured optical fiber made of bioresorbable phosphate glass.

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Applying the finite-element method to determine the die swell phenomenon during the extrusion of glass rods with non-circular cross-sections

Cited by 11 publications

References 3 publications

Melt spinning of synthetic polymeric filaments

Melt spinning of synthetic polymeric filaments

Computational Modeling of Die Swell of Extruded Glass Preforms at High Viscosity

Toward the fabrication of extruded microstructured bioresorbable phosphate glass optical fibers

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