Progressive transformations of silica glass upon densification

Sonneville, Camille; Mermet, A.; Champagnon, B.; Martinet, C.; Margueritat, Jérémie; Ligny, Dominique de; Deschamps, Thierry; Balima, Félix

doi:10.1063/1.4754601

Cited by 51 publications

(79 citation statements)

References 44 publications

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“…Nevertheless, the anomalous decrease in elastic modulus with increasing pressure upon initial compression is very well reproduced. Our computational study is in good agreement with previous studies 10,36 and with observations from our experiments [ Fig. 3(a)] that the elastic anomaly progressively vanishes with the degree of densification during pressure-quenching.…”

Section: A Elastic Anomaly and Irreversible Densificationsupporting

confidence: 82%

Tailoring structure and properties of silica glass aided by computer simulation

et al. 2016

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By using a combination of experiments and molecular dynamics simulations, our studies show that the elastic response of silica glass to initial compression gradually changes from abnormal to normal with increasing quench pressure, helium content or alkali modifier added in the glass matrix. We uncovered the structural origin of the elastic anomaly in silica glass as localized structural transitions between motifs of different stiffness that are similar to those found in its crystalline counterparts. Pressure-quenching, helium-stuffing, or alkali-modifying plays a different role in changing the structure of silica glass, but all of the resulting structures reduce the propensity for such local structural transitions to take place, thus the degree of elastic anomaly. Our studies demonstrate that by processing in ways that gradually eliminates the elastic anomaly, the degree of silica glass to undergo irreversible densification can be eventually eradicated. This provides a solid foundation for the bottom-up design of new glasses with tunable structure and properties.

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Section: A Elastic Anomaly and Irreversible Densificationsupporting

confidence: 82%

Tailoring structure and properties of silica glass aided by computer simulation

et al. 2016

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“…The FEA indentation simulation (Figure , right side) did not achieve the densification saturation value of fused silica (21%) from literature when using the equivalent cone of Berkovich/Vickers geometry. Stress trajectories in p ‐ q plane provide additional insight into the plastic flow and densification behavior during deformation .…”

Section: Resultsmentioning

confidence: 78%

“…Fused silica exhibits a Poisson ratio ranging from 0.15 to 0.18. It can be densified by up to 21% and is often taken as a model for studying the densification behavior of glasses. Diamond anvil cell (DAC) experiments are typically employed for this purpose.…”

Section: Introductionmentioning

confidence: 99%

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Indentation densification of fused silica assessed by raman spectroscopy and constitutive finite element analysis

Bruns

Uesbeck²,

Fuhrmann

et al. 2020

J Am Ceram Soc

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Inelastic deformation of anomalous glasses manifests in shear flow and densification of the glass network; the deformation behavior during indentation testing is linked strongly to both processes. In this paper, the indentation densification field of fused silica is investigated using depth‐resolved Raman spectroscopy and finite element simulations. Through affecting the size of the indent, the normal load and the Raman laser spot size determine the spatial sampling resolution, leading to a certain degree of structural averaging. For appropriate combinations of normal load (indent size) and laser spot diameter, a maximum densification of 18.4% was found at the indent center. The indentation behavior was modeled by extended Drucker‐Prager‐Cap (DPC) plasticity, assuming a sigmoidal hardening behavior of fused silica with a densification saturation of 21%. This procedure significantly improved the reproduction of the experimental densification field, yielding a maximum densification of 18.2% directly below the indenter tip. The degree of densification was found to be strongly linked to the hydrostatic pressure limit below the indenter in accordance to Johnson's expanding cavity model (J. Mech. Phys. Solids, 18 (1970) 115). Based on the good overlap between FEA and Raman, an alternative way to extract the empirical correlation factor m, which scales structural densification to Raman spectroscopic observations, is obtained. This approach does not require the use of intensive hydrostatic compaction experiments.

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“…SiO 2 , soda-lime silicate and borosilicate glasses have been studied by several groups to establish calibration curves between applied pressure and the Raman spectra in order to quantify the local densification in glasses after indentation [7][8][9][60][61][62][63][64][65][66][67]. For silica glass, for example, the shift of the 430-490 cm −1 peak was correlated directly to glass densification caused by structural rearrangements as revealed by both, in-situ and ex-situ Raman measurements.…”

Section: Pressure Mapping By the Raman Shift δν Maxmentioning

confidence: 99%