Investigating relaxation of glassy materials based on natural vibration of beam: A comparative study of borosilicate and chalcogenide glasses

Wang, Jianbiao; Ruan, Haihui; Wang, Xu; Wan, Jianquan

doi:10.1016/j.jnoncrysol.2018.07.071

Cited by 14 publications

(15 citation statements)

References 52 publications

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“…All the cases are modeled in MSC.Marc, which is a powerful FE software in nonlinear analysis. 16,[38][39][40] Figure 8 shows the tested and numerically reproduced creep displacements in the three cases. The basic material properties of all participating parts are given in Table 3.…”

Section: Numerical Reproduction Of the Cctsmentioning

confidence: 99%

“…The basic material properties of all participating parts are given in Table 3. 16,[38][39][40] Figure 8 shows the tested and numerically reproduced creep displacements in the three cases. Clearly, there are considerable differences Δu between the tested and reproduced creep displacements for Case 1 and 2, with the maximum of Δu = 0.42 mm and 0.19 mm respectively, whereas a minor difference (Δu = 0.01 mm) is observed in Case 3.…”

Section: Numerical Reproduction Of the Cctsmentioning

confidence: 99%

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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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Section: Numerical Reproduction Of the Cctsmentioning

confidence: 99%

Section: Numerical Reproduction Of the Cctsmentioning

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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“…Based on the Euler-Bernoulli beam theory, the response function of a free-standing beam can be expressed as [29]: Substituting s=iω into Eq. (8), the Fourier spectrum of the beam vibration can be obtained as:…”

Section: Theoretical Results Of the Vibration Spectrum Of A Free-stanmentioning

confidence: 99%

“…Therefore, 2 IS  should be multiplied by exp(t/τα) with τα being the structural relaxation time. This is also because the stress relaxation induced by α relaxation in silicate glass is nearly exponential at the temperature higher than Tg [29]. The second term on the right-hand side of Eq.…”

Section: The Viscoelastic Model Based On the Theory Of Normal Mode Anmentioning

confidence: 97%

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On the mechanical β relaxation in glass and its relation to the double-peak phenomenon in impulse excited vibration at high temperatures

Wang

Ruan

2020

Journal of Non-Crystalline Solids

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A viscoelastic model is established to reveal the relation between α-β relaxation of glass and the double-peak phenomenon in the experiments of impulse excited vibration. In the modelling, the normal mode analysis (NMA) of potential energy landscape (PEL) picture is employed to describe mechanical α and β relaxations in a glassy material. The model indicates that a small β relaxation can lead to an apparent double-peak phenomenon resulted from the free vibration of a glass beam when the frequency of β relaxation peak is close to the natural frequency of specimen. The theoretical prediction is validated by the acoustic spectrum of a fluorosilicate glass beam excited by a mid-span impulse. Furthermore, the experimental results indicate a negative temperature-dependence of the frequency of β relaxation in the fluorosilicate glass S-FSL5 which can be explained based on the physical picture of fragmented oxide-network patches in liquid-like regions.

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Overall Aspects of Glasses for Photonic Devices

Lozano²,

Pinto³

et al. 2023

Advances in Glass Research

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Investigating relaxation of glassy materials based on natural vibration of beam: A comparative study of borosilicate and chalcogenide glasses

Cited by 14 publications

References 52 publications

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

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

On the mechanical β relaxation in glass and its relation to the double-peak phenomenon in impulse excited vibration at high temperatures

Overall Aspects of Glasses for Photonic Devices

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