High‐Pressure Effects on Oxide Glasses: I, Densification in Rigid State

Mackenzie, John D.

doi:10.1111/j.1151-2916.1963.tb13776.x

Cited by 287 publications

(151 citation statements)

References 23 publications

(2 reference statements)

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“…This is supported by Mackenzie, who argues that densification is basically an entanglement of structural units. This would mean that the main part of densification takes place during shear deformation (Mackenzie, 1963). Thus, an increasing activation of shear deformation (Limbach et al, 2014) would be transferred to an increasing amount of densification.…”

Section: The Effect Of Strain Rate On the Deformation Mechanismmentioning

confidence: 99%

Influence of Cooling Rate on Cracking and Plastic Deformation during Impact and Indentation of Borosilicate Glasses

et al. 2017

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The influence of a changing glass topology on local mechanical properties was studied in a multitechnique nanomechanical approach. The glass response against sharp contacts can result in structural densification, plastic flow, or crack initiation. By using instrumented indentation testing, the mechanical response was studied in different strain rate regimes for a sodium borosilicate glass (NBS) exhibiting altering structures due to varying processing conditions. Comparison with data from former studies and with literature data on other glass structures helped to elucidate the role of the borate and silicate subnetworks and to understand the overall mechanical properties of the mixed glass systems. A peculiarity of some of the NBS glasses tested in this study is the fact that the connectivity of the borate and silicate entities depends on the sample's thermal history. Although the influence on macroscopic material properties such as E and H is minor, the onset of cracking indeed is influenced by those structural changes within the glass. Rapidly quenched glass shows an improved crack resistance, which is even more pronounced at high strain rates. Studies on various processing conditions further indicate that this transition is closely related to the cooling rate around Tg. The strain rate dependence of cracking is discussed in terms of the occurrence of shear deformation and densification.

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Section: The Effect Of Strain Rate On the Deformation Mechanismmentioning

confidence: 99%

Influence of Cooling Rate on Cracking and Plastic Deformation during Impact and Indentation of Borosilicate Glasses

et al. 2017

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“…For more details, the reader can refer to [14]. Several other works treating the shearing effects can be found in the literature [15,16,17]. At present, this subject has not been resolved, and the role of the shearing stresses in densification remains ambiguous.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Vickers indentation of silica glass

Jebahi

Debenath

Dau

et al. 2013

Journal of Non-Crystalline Solids

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractThe indentation response of glasses can be classified under three headings: normal, anomalous and intermediate, depending on the deformation mechanism and the cracking response. Silica glass, as a typical anomalous glass, deforms primarily by densification and has a strong tendency to form cone cracks that can accompany median, radial and lateral cracks when indented with a Vickers tip. This is due to its propensity to deform elastically by resisting plastic flow. Several investigations of this anomalous behavior can be found in the literature. The present paper serves to corroborate these results numerically using the discrete element method. A new pressuredensification model is developed in this work that allows for a quantitative estimate of the densification under very high pressure. This model is applied to simulate the Vickers indentation response of silica glass under various indentation forces using the discrete element method first, and then a discrete-continuum coupling method with large simulation domains to suppress the side effects and reduce the computational time. This coupling involves the discrete element method (DEM) and the constrained natural element method (CNEM). The numerical results obtained in this work compare favorably with past experimental results.

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“…By applying pressures of 10 GPa (100 kbar) at room temperature, a vitreous material was produced that lacked an x-ray diffraction pattern and had a density of 2.6 g cm. -3 (2) MacKenzie ( 3 ) later obtained infrared spectra of compacted fused silica, but only slight changes in the Si-O stretching frequency were uncovered. Raman spectra of compacted fused silica, however, do not appear to be available, despite…”

Section: #1mentioning

confidence: 99%