| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Grunwald, Tim
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2024Friction in glass forming: Tribological behaviors of optical glasses and uncoated steel near glass transition temperaturecitations
- 2023Machine learning-based predictions of form accuracy for curved thin glass by vacuum assisted hot forming processcitations
- 2023Variationskraftgeregeltes 5-Achs-Schleifen ; The variation force-controlled finishing of curved tool steel surfaces with mounted points
- 2022Mold protective coatings for precision glass molding
- 2022Simulation of the Refractive Index Variation and Validation of the Form Deviation in Precisely Molded Chalcogenide Glass Lenses (IRG 26) Considering the Stress and Structure Relaxationcitations
- 2022Simulation of the Refractive Index Variation and Validation of the Form Deviation in Precisely Molded Chalcogenide Glass Lenses (IRG 26) Considering the Stress and Structure Relaxationcitations
- 2022Enabling Sustainability in Glass Optics Manufacturing by Wafer Scale Molding
- 2022Modeling nonequilibrium thermoviscoelastic material behaviors of glass in nonisothermal glass moldingcitations
- 2021Machine learning-based predictive modeling of contact heat transfercitations
- 2020Modeling of thermo-viscoelastic material behavior of glass over a wide temperature range in glass compression moldingcitations
- 2020Thermo-viscoelastic modeling of nonequilibrium material behavior of glass in nonisothermal glass moldingcitations
- 2020Precision Glass Molding of infrared optics with anti-reflective microstructurescitations
- 2019Experimental investigation of contact heat transfer coefficients in nonisothermal glass molding by infrared thermographycitations
- 2019Approaches and Methodologies for Process Development of Thin Glass Formingcitations
- 2019Molded anti-reflective structures of chalcogenide glasses for infrared optics by precision glass moldingcitations
- 2018Scalability of the precision glass molding process for an efficient optics productioncitations
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article
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 – 6.8 Pas. The method eventually promises an enhancement of the glass molding simulation.