High temperature friction characterization for viscoelastic glass contacting a mold

Ananthasayanam, Balajee; Joshi, Dhananjay; Stairiker, Matthew; Tardiff, Matthew; Richardson, Kathleen; Joseph, Paul

doi:10.1016/j.jnoncrysol.2013.11.007

Cited by 20 publications

(32 citation statements)

References 21 publications

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“…Furthermore, in the manufacture of precision lenses and MOFs a relatively high viscosity in the range of 10 7 -10 9 Pa•s must be used. Therefore, interface slip between the glass and die/mold surface occurs [19][20][21][22][23], which has been shown to affect size and shape [22,24] of the resulting component.…”

Section: Introductionmentioning

confidence: 99%

Computational Modeling of Hole Distortion in Extruded Microstructured Optical Fiber Glass Preforms

Trabelssi

Ebendorff-Heidepriem

Richardson

et al. 2015

J. Lightwave Technol.

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Section: Introductionmentioning

confidence: 99%

Computational Modeling of Hole Distortion in Extruded Microstructured Optical Fiber Glass Preforms

Trabelssi

Ebendorff-Heidepriem

Richardson

et al. 2015

J. Lightwave Technol.

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“…27 This is the initial motivation to the development of several experimental and computational methods concerning friction evaluation. 12,13,28 Considering the temperature dependence, Sarhadi et al evaluated the glass-mold interface friction through ring compression tests at several temperatures. 27 Ananthasayanam et al investigated the glass-mold frictional behavior via ring compression tests, where a universal set of friction calibration curves were obtained by numerical iterations, which allowed for a reliable friction evaluation without the need for knowing the material properties.…”

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confidence: 99%

A comprehensive study on frictional dependence and predictive accuracy of viscoelastic model for optical glass using compression creep test

Luo

Zhang

et al. 2019

J Am Ceram Soc

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Compression creep tests (CCTs) have been widely used in phenomenological characterization of viscoelastic materials such as glasses. However, disturbed by specimen‐tool interface friction, the real stress‐strain data regarding the pure viscoelastic deformation are frequently misestimated in conventional CCTs, causing decreased accuracies of the derived viscoelastic parameters. This study proposes a comprehensive CCT‐based approach to develop a viscoelastic model with weakened frictional disturbance and enhanced predictive accuracy. An integrated calculation procedure is first built to mathematically characterize the frictional and viscoelastic behaviors of glass during compression. Uniaxial CCTs of a typical borosilicate glass (L‐BAL42) are then performed at varied frictional conditions. The quantified coefficients of interface friction indicate that a minor frictional disturbance is achieved when Nickel foils are used as interfacial layers, whereby a more realistic viscoelastic constitutive relation of the glass is derived. The obtained frictional and viscoelastic constants are further incorporated into computational modeling of the CCT and precision molding processes. The demonstrated consistencies between the simulated and measured results (creep displacement and molding force) suggest that, by technically slashing the interface friction and theoretically correcting the friction‐involved stress in CCTs, the frictional disturbance to experimental stress‐strain data can be effectively weakened, and a viscoelastic model of enhanced predictive accuracy can be thus developed.

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“…The results revealed that the temperature inside the glass during the cooling stage had a considerable influence on the lens shape and internal stress. Additionally, Ananthasayanam and Tai et al indicated that temperature non‐uniformity may have a significant effect on deformation of the glass sample. Xie et al investigated the relationship between heating time and surface morphology.…”

Section: Introductionmentioning

confidence: 99%

Temperature effect on the deformation and optical quality of moulded glass lenses in precision glass moulding

Huang

et al. 2019

Int J of Appl Glass Sci

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The aim of this study was to thoroughly investigate the effect of temperature on the deformation behavior and optical performance of moulded glass in a nonuniform temperature field. Experiments and numerical simulations were used to analyze how different temperature gradients distributed across a glass cylinder affected the deformation behavior of the moulded glass. Additionally, the imaging quality of the moulded glass lens was detected using the optical measurement system. The results show that the overall shape of the moulded glass cylinder was mainly determined by the value of the temperature gradient. The larger temperature gradient led to smaller deformation angle θ in the moulded glass cylinder. Temperature difference inside the glass dominantly affected the deformation behavior and surface morphology in the nonuniform temperature field, which greatly determines the imaging quality of glass lenses. The results of this study are significant for glass lens fabrication.

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High temperature friction characterization for viscoelastic glass contacting a mold

Cited by 20 publications

References 21 publications

Computational Modeling of Hole Distortion in Extruded Microstructured Optical Fiber Glass Preforms

Computational Modeling of Hole Distortion in Extruded Microstructured Optical Fiber Glass Preforms

A comprehensive study on frictional dependence and predictive accuracy of viscoelastic model for optical glass using compression creep test

Temperature effect on the deformation and optical quality of moulded glass lenses in precision glass moulding

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