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  4. Modeling of thermo-viscoelastic material behavior of glass over a wide temperature range in glass compression molding
 
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2020
Journal Article
Title

Modeling of thermo-viscoelastic material behavior of glass over a wide temperature range in glass compression molding

Abstract
In glass compression molding, most current modeling approaches of temperature-dependent viscoelastic behavior of glass materials are restricted to thermo-rheologically simple assumption. This research conducts a detailed study and demonstrates that this assumption, however, is not adequate for glass molding simulations over a wide range of molding temperatures. In this paper, we introduce a new method that eliminates the prerequisite of relaxation functions and shift factors for modeling of the thermo-viscoelastic material behavior. More specifically, the temperature effect is directly incorporated into each parameter of the mechanical model. The mechanical model parameters are derived from creep displacements using uniaxial compression experiments. Validations of the proposed method are conducted for three different glass categories, including borosilicate, aluminosilicate, and chalcogenide glasses. Excellent agreement between the creep experiments and simulation results is found in all glasses over long pressing time up to 900 seconds and a large temperature range that corresponds to the glass viscosity of log (η) = 9.5 â 6.8 Pas. The method eventually promises an enhancement of the glass molding simulation.
Author(s)
Vu, Anh Tuan  orcid-logo
Fraunhofer-Institut für Produktionstechnologie IPT  
Vu, Anh Ngoc
Fraunhofer-Institut für Produktionstechnologie IPT  
Grunwald, Tim  
Fraunhofer-Institut für Produktionstechnologie IPT  
Bergs, Thomas  
Fraunhofer-Institut für Produktionstechnologie IPT  
Journal
Journal of the American Ceramic Society  
Open Access
File(s)
Download (2.16 MB)
Rights
CC BY 4.0: Creative Commons Attribution
DOI
10.1111/jace.16963
10.24406/h-261352
Additional full text version
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Language
English
Fraunhofer-Institut für Produktionstechnologie IPT  
Keyword(s)
  • FEM simulation

  • Glass molding

  • thermo-rheologically simple

  • thermo-viscoelastic modeling

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