Indentation crack initiation in ion-exchanged aluminosilicate glass

Morris, Dylan J.; Myers, Sasha B.; Cook, Robert F.

doi:10.1023/b:jmsc.0000020002.06117.46

Cited by 43 publications

(45 citation statements)

References 29 publications

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“…The conjugate “threshold” indentation loads are given in the Supplemental Material. (Such an assessment is properly the subject for dedicated threshold studies involving in situ acoustic or optical observations or ex situ observations, but here the large amount of data from goals (1) and (2) can provide insight, consistent with the philosophy above. )…”

Section: Introductionsupporting

confidence: 56%

A critical evaluation of indentation crack lengths in air

Cook

2019

J Am Ceram Soc

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An extensive overview is presented of Vickers indentation crack lengths in ceramics in air. Measurement of such crack lengths is one of the most common and powerful assessments of the fracture properties of ceramics and the overview provides a critical evaluation of observed behavior as functions of material type and indentation load, and an extensive basis for comparison of results from new materials and analyses.The overview considers single crystals, polycrystals, transforming materials, glasses, and multiphase materials, including cermets, glass-ceramics, and tooth enamel. The coverage extends over structural and electronic ceramics, including oxides, carbides, nitrides, and titanates. The data are presented in a single format for ease of interpretation in terms of idealized indentation fracture and for inter-material comparisons; most data are unique to this work, but the results of selected studies from the published literature are included. The overview considers the precision and accuracy of crack length measurements and demonstrates a simple quantitative evaluation and ranking scheme for ceramic fracture based on load-adjusted crack length and cracking susceptibility. Indentation hardness and cracking threshold are also determined and related to the susceptibility. Material toughness is related to cracking susceptibility by fracture mechanics analyses: typical crack length measurements in air are shown to provide estimates of inert toughness with a relative uncertainty of ±50%. K E Y W O R D Scracks/cracking, fracture, fracture mechanics/toughness, hardness, indentation

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Section: Introductionsupporting

confidence: 56%

A critical evaluation of indentation crack lengths in air

Cook

2019

J Am Ceram Soc

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“…For each glass sample, the indentation threshold load for radial cracks initiation with a cube‐corner indenter was obtained. As the crack formation was a stochastic process, the threshold load for radial cracks initiation was defined as the load at or above which 60% of the possible radial cracks formed to take the variability into account . For each indentation load, ten indentation experiments were carried out in random positions on the surface to find the threshold load.…”

Section: Methodsmentioning

confidence: 99%

“…As the main material for fabricating the touch screen panels and windshields for aircraft, the susceptibility of ion‐exchanged glasses to damage initiation is as important as the strength of the material. Indentation is a useful method to study the mechanics of damage initiation under abrasive or particle impact condition . Among the cracks formed during indentation, radial cracks are considered to be representative of strength‐controlling flaws.…”

Section: Introductionmentioning

confidence: 99%

New insights into nanoindentation crack initiation in ion‐exchanged sodium aluminosilicate glass

Jiang

Mohagheghian

et al. 2018

J Am Ceram Soc

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The effect of ion‐exchange on the fracture behavior and the threshold load is investigated for radial crack initiation resulting from cube‐corner indentation. Both tin and air sides of the sodium aluminosilicate float glass are considered. The threshold load and mechanical properties are experimentally measured by nanoindentation. A qualitative explanation of crack initiation is developed by analyzing the stresses at the indentation site. The ion‐exchanged glasses show a lower threshold load for radial crack initiation with a cube‐corner indenter than the raw glass, and this is due to a higher crack driving stress for ion‐exchanged glasses. However, the compressive stress on the surface of the ion‐exchanged glasses can inhibit the expanding of the radial cracks. The air side always shows higher values for the threshold load than the tin side before and after ion‐exchange, which is in accordance with the calculated crack driving stress results.

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“…With the increasing importance of MEMS and MOEMS (micro-electromechanical and micro-optoelectronic devices), stress characterization in small volumes has acquired even more importance. Residual stress measurement techniques utilized for ceramics and glasses include: birefringence methods, 3 sequential material removal and curvature measurements, [4][5][6] Raman spectroscopy, 7 sharp, [8][9][10][11][12] and blunt 13,14 indentation based techniques. Each of these techniques has its strengths and limitations: destructive (sequential material removal, indentation) versus nondestructive (birefringence, Raman), presence versus absence of specific material response (as in Raman), need for expensive equipment (as in Raman) versus ease of use (indentation).…”

Section: Introductionmentioning

confidence: 99%

“…The indentation techniques mentioned above [8][9][10][11][12][13][14] have employed either a sharp Vickers indenter or a blunt spherical indenter. The use of these techniques has an inherent size limitation: the stress sampled is on the length scale of the characteristic crack size, c, emanating from the indentation site.…”

Section: Introductionmentioning

confidence: 99%

A technique for measuring stresses in small spatial regions using cube-corner indentation: Application to tempered glass plates

Tandon

2007

Journal of the European Ceramic Society

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Indentation crack initiation in ion-exchanged aluminosilicate glass

Cited by 43 publications

References 29 publications

A critical evaluation of indentation crack lengths in air

A critical evaluation of indentation crack lengths in air

New insights into nanoindentation crack initiation in ion‐exchanged sodium aluminosilicate glass

A technique for measuring stresses in small spatial regions using cube-corner indentation: Application to tempered glass plates

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