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Type: Journal article
Title: Computational modeling of die swell of extruded glass preforms at high viscosity
Author: Trabelssi, M.
Ebendorff-Heidepriem, H.
Richardson, K.
Monro, T.
Joseph, P.
Citation: Journal of the American Ceramic Society, 2014; 97(5):1572-1581
Publisher: American Ceramic Society
Issue Date: 2014
ISSN: 0002-7820
Editor: Scherer, G.
Organisation: Institute for Photonics & Advanced Sensing (IPAS)
Statement of
Mohamed Trabelssi, Heike Ebendorff-Heidepriem, Kathleen C. Richardson, Tanya M. Monro and Paul F. Joseph
Abstract: 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 107.4–108.8 Pa·s 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.
Rights: © 2014 The American Ceramic Society
DOI: 10.1111/jace.12913
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