| 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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Vu, Ngoc Anh
University of Twente
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2023Modeling of yarn interactions for non-axisymmetric biaxial overbraiding simulationscitations
- 2022Experimental and numerical investigation of frictional behavior of carbon yarns for over-braiding conditions
- 2022Yarn interaction in an enhanced kinematic model of the triaxial overbraiding process
- 2020Modeling of thermo-viscoelastic material behavior of glass over a wide temperature range in glass compression moldingcitations
- 2020Modeling the effect of temperature and degree of crystallinity on the mechanical response of Polyamide 6citations
- 2019Experimental investigation of contact heat transfer coefficients in nonisothermal glass molding by infrared thermographycitations
- 2011Structural Response of Corroded, Unbonded Posttensioned Beamscitations
- 2009Effect of stress corrosion cracking on stress–strain response of steel wires used in prestressed concrete beamscitations
- 2009Corroded post-tensioned beams with bonded tendons and wire failurecitations
Places of action
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article
Experimental investigation of contact heat transfer coefficients in nonisothermal glass molding by infrared thermography
Abstract
Nonisothermal glass molding has recently become a promising technology solution for the cost‐efficient production of complex precision glass optical components. During the molding process, the glass temperature and its temperature distribution have crucial effects on the accuracy of molded optics. In nonisothermal molding, the glass temperature is greatly influenced by thermal contact conductance because there is a large temperature difference between the glass and mold parts. Though widely agreed to be varied during the molding process, the contact conductance was usually assumed as constant coefficients in most early works without sufficient experimental justifications. This paper presents an experiment approach to determine the thermal contact coefficient derived from transient temperature measurements by using infrared thermographic camera. The transient method demonstrates a beneficially short processing time and the adequate measurement at desirable molding temperature without glass sticking. Particularly, this method promises the avoidance of the overestimated contact coefficients derived from steady‐state approach due to the viscoelastic deformation of glass during the inevitably long period of holding force. Based on this method, the dependency of thermal contact conductance on mold surface roughness, contact pressure, and interfacial temperature ranging from slightly below‐to‐above glass transition temperature was investigated. The results reveal the dominance of interfacial temperature on the contact conductance while the linear pressure‐dependent conductance with an identical slope observed for all roughness and mold temperatures. The accurate determination of the contact heat transfer coefficients will eventually improve the predictions of the form accuracy, the optical properties, and possible defects such as chill ripples or glass breakage of molded lenses by the nonisothermal glass molding process