Constitutive modeling of the densification process in silica glass under hydrostatic compression

Kéryvin, Vincent; Meng, Jie; Gicquel, S.; Guin, Jean‐Pierre; Charleux, Ludovic; Sangleboeuf, Jean‐Christophe; Pilvin, P.; Rouxel, Tanguy; Quilliec, Guénhaël Le

doi:10.1016/j.actamat.2013.07.067

Cited by 45 publications

(49 citation statements)

References 36 publications

(108 reference statements)

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“…However, the response of glass under shear stress is of primary importance to understand threshold of deformation or cracking in glass. For example, these two types of yield criteria are indispensable to obtain the reliable constitutive model for the plastic deformation of glass (Lambropoulos et al, 1997;Lacroix et al, 2012;Keryvin et al, 2014). According to the constitutive models proposed, the yield criterion of glass varies with the type of loading.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Sinking-In and Cracking Behavior of Soda-Lime Glass under Varying Angle of Trigonal Pyramid Indenter

et al. 2016

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It is well known that glass undergoes elastic and inelastic deformation under a sharp diamond indenter. Although brittle or less brittle behavior of glass must be connected with such mechanical responses of glass under the indenter, there has been limited research on in situ deformation behavior of glass during the loading and unloading indentation cycle. This is because most indentation tests were conducted using a commercial hardness tester for which this information is not available. In this study, the in situ sinking-in region of glass during indentation test is determined using a custom-designed indentation microscope with trigonal pyramid indenters having different tip angles. It is found that both the shape of contact region and the amount of sinking-in are affected by indenter geometries and that the projected contact region of the glass sample under Berkovich indenter is not a regular triangle but a concave triangle with bowed-in edges. This is due to the larger amount of sinking-in under the face than under the ridge of indenter. It is also found that these deformation behaviors of glass are inseparably linked with contact damage or cracking in glass.

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Section: Methodsmentioning

confidence: 99%

Evaluation of Sinking-In and Cracking Behavior of Soda-Lime Glass under Varying Angle of Trigonal Pyramid Indenter

et al. 2016

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“…This issue was addressed in a study focusing on the modelling of the densification process in a-SiO 2 [74] which demonstrated that accounting for the evolution of the elastic moduli has a marked effect on the result of the modelling. In the case of Vickers, Berkovich or cube-corner indenters, densification is also promoted in regions in contact with the indenter edges, as was shown by Ji et al [70] in the case of Vickers indenter.…”

Section: Search For a Constitutive Lawmentioning

confidence: 99%

Driving force for indentation cracking in glass: composition, pressure and temperature dependence

Rouxel

2015

Phil. Trans. R. Soc. A.

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The occurrence of damage at the surface of glass parts caused by sharp contact loading is a major issue for glass makers, suppliers and end-users. Yet, it is still a poorly understood problem from the viewpoints both of glass science and solid mechanics. Different microcracking patterns are observed at indentation sites depending on the glass composition and indentation cracks may form during both the loading and the unloading stages. Besides, we do not know much about the fracture toughness of glass and its composition dependence, so that setting a criterion for crack initiation and predicting the extent of the damage yet remain out of reach. In this study, by comparison of the behaviour of glasses from very different chemical systems and by identifying experimentally the individual contributions of the different rheological processes leading to the formation of the imprint-namely elasticity, densification and shear flow-we obtain a fairly straightforward prediction of the type and extent of the microcracks which will most likely form, depending on the physical properties of the glass. Finally, some guidelines to reduce the driving force for microcracking are proposed in the light of the effects of composition, temperature and pressure, and the areas for further research are briefly discussed.

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“…Newly available data made it possible to have this reference experiment [16,17]. Figure 1 is a comparison between these experiments and the numerical simulation with our model, which is very good in contrast to previous modellings as discussed in [15]. The constitutive equations and the values of all model parameters are not presented in details here for reasons of space and clarity; they can be found in [15].…”

Section: Pressure-induced Densification (Pid)mentioning

confidence: 99%

“…Recently, we have proposed a constitutive model accounting for the different mechanisms in silica glass under pure hydrostatic compression [15]. The salient features of this model are presented here and are schematised on Figure 1.…”

Section: Pressure-induced Densification (Pid)mentioning

confidence: 99%

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Densification as the Only Mechanism at Stake during Indentation of Silica Glass?

Kéryvin

Gicquel

Charleux

et al. 2014

KEM

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Abstract. Silica glass is known to exhibit permanent changes in density under very high pressures. These changes may reach 21%. The sharp indentation test develops pressures underneath the indenter that trigger densification. Recently, we have proposed a constitutive modeling of the pressure-induced process accounting for its salient features: densification threshold, hardening, saturation of densification and permanent increase in elastic moduli. We examine in this paper the possibility that densification could be the only mechanism for creating an imprint by indentation. We consider different models with growing complexity that we implement in a finite element software. Results indicate that the combination of shear and pressure as a driving force to densification may account for the mechanical response of the indentation test as well as the presence of densified zone underneath the imprint.

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Constitutive modeling of the densification process in silica glass under hydrostatic compression

Cited by 45 publications

References 36 publications

Evaluation of Sinking-In and Cracking Behavior of Soda-Lime Glass under Varying Angle of Trigonal Pyramid Indenter

Evaluation of Sinking-In and Cracking Behavior of Soda-Lime Glass under Varying Angle of Trigonal Pyramid Indenter

Driving force for indentation cracking in glass: composition, pressure and temperature dependence

Densification as the Only Mechanism at Stake during Indentation of Silica Glass?

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