Indentation deformation/fracture of normal and anomalous glasses

Arora, Arushi; Marshall, David B.; Lawn, Brian R.; Swain, Michael V.

doi:10.1016/0022-3093(79)90154-6

Cited by 318 publications

(224 citation statements)

References 27 publications

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“…It is well known that glasses can be grouped into two: normal and anomalous glasses. Normal glass prefers shear flow, and anomalous glass does densification (Arora et al, 1979). Not only glass composition but also indenter geometries change the deformation mechanism of glass.…”

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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“…However, fused silica glass deforms dominantly by densification and has a tendency to form ring and cone-like cracks, the behaviour of soda-lime-silica glass and fused silica glass are commonly considered as "normal" and "anomalous", respectively. (7,8) Through efforts to produce glasses with higher toughness, several research groups have found new low brittleness glasses. Sehgal & Ito reported that a new formulated glass (density 2·4 g/cm 3 and chemical formulation 13Na 2 O.1K 2 O.4MgO.1CaO.2Al 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

Indentation cracking behaviour and structures of nanophase separation of glasses

Cheng¹,

Song²,

Ercius³

et al. 2017

Phys. Chem. Glasses: Eur. J. Glass Sci. Technol. B

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“…The term anomalous behavior was coined for vitreous silica, which showed a densification ability up to 20%, a contrary behavior against mechanical impact as most other glasses (Arora et al, 1979;Barlet et al, 2015). However, silica remains perhaps the most studied glass, and other commercially important silica rich glasses fall into this category as well, including ultralow expansion glass (SiO2-TiO2) or the low-alkaline borosilicate glasses of the pyrex or duran type.…”

mentioning

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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Indentation deformation/fracture of normal and anomalous glasses

Cited by 318 publications

References 27 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

Indentation cracking behaviour and structures of nanophase separation of glasses

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

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