Statistical analysis of propagation rates of indentation-induced radial cracks in soda-lime-silica glass

Kiefer, P.; Deubener, Joachim; Müller, Ralf; Behrens, Harald

doi:10.1016/j.jnoncrysol.2019.119739

Cited by 6 publications

(15 citation statements)

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“…Further, large differences in the initial propagation rates from crack to crack are evident, leading to a broad distribution of crack lengths already shortly after their initiation (<5 s). This feature underlines the demand of analyzing crack propagation using large data sets with N > 200 (Kiefer et al, 2020). Figure 4 exemplarily shows cumulative distribution functions of the crack length c 50s (t−δ = 50 s).…”

Section: Resultsmentioning

confidence: 75%

“…A two-phase exponential growth model was used to describe the dependence of average crack length on propagation time since a single-phase power-law (Dériano et al, 2004;Pönitzsch et al, 2016;Kiefer et al, 2020) noticeably overestimates the early stage (t−δ) ≤ 5 s of most tests in higher humidity. The fitting procedure was carried out for c av data of each glass and testing environment of Figure 5, which resulted in smoothed crack length data of the form:…”

Section: Resultsmentioning

confidence: 99%

“…Table 1 summarizes the total number of median radial cracks that were initiated during Vickers indentation and counted at the end of the video acquisition of the series in dry environment after 60 s and of the series in humid environment after 65 s, respectively. Representative images of Vickers induced cracks and their growth by video capturing were presented in a previous paper (Kiefer et al, 2020). According to Wada et al (1974), the probability of crack initiation was determined by the crack number-to-corner number ratio, with 4 corners per indent z of the Vickers diamond.…”

Section: Automated Data Processing Of Vickers Induced Crack Growthmentioning

confidence: 99%

“…A series of 5 microscope slide glasses with water contents ranging from 0.75 to 17.08 (mol%) was tested in two different environments (dry N 2 gas and air) to explore water-dependent effects. In spite of the limitations due to unknown amplitude of the residual stress field in this case, the technique of indentation allowed, in principle, automated experiments as well as automated data processing and analysis (Kiefer et al, 2020). Thus, to demonstrate statistical significance, the growth of in total 3279 cracks was recorded (= 6.165 million frames) and automatically analyzed to determine the mean crack length within the first minute of propagation of each glass with high accuracy.…”

Section: Introductionmentioning

confidence: 99%

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Automated Analysis of Slow Crack Growth in Hydrous Soda-Lime Silicate Glasses

et al. 2020

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To explore the impact of ambient and structural water on static fatigue, the initiation and growth of 3279 Vickers induced median radial cracks were automatically recorded and analyzed. We find that humidity is more efficient in initiating cracks and promoting their growth than water, which is dissolved in the glass structure. In particular for slow crack growth (< 3 × 10 −6 m s −1), tests in dry nitrogen showed a considerable decrease in the crack growth exponent with increasing water content of the glasses. On the other hand, if tests were performed in humid air, the crack growth exponent was independent of the water content of the hydrous glasses, while stress intensity decreased slightly. These observations indicate that water promotes the processes at the crack-tip regardless of its origin. However, ambient water is more efficient.

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Section: Resultsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Automated Data Processing Of Vickers Induced Crack Growthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Automated Analysis of Slow Crack Growth in Hydrous Soda-Lime Silicate Glasses

et al. 2020

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“…Vickers indentation has become an established method for artificially induced cracks. Caution is nevertheless required, as the lateral cracks created do not always form in the geometry and depth under almost identical conditions, (Mikowski et al 2006;Kiefer et al 2020). During indentation, the glass undergoes plastic deformations, which can be divided into densification and shearflow, while both have different effects on the formation of lateral cracks (Kato et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Subcritical crack growth parameters in glass as a function of environmental conditions

2020

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In the present work, subcritical crack growth in soda–lime silicate glass is investigated under different environmental conditions. Crack growth parameters as a function of temperature and humidity were determined by dynamic fatigue tests, which has been verified by using the in-situ method of filming crack growth during experiments. The specimens were pre-damaged for constant initial crack lengths in all specimens using the Vickers indentation test. The determined parameters were compared with those from literature in order to discuss existing deviations of sub-critical crack growth parameters in literature. These deviations may be caused by environmental conditions and different chemical compositions of the glass. Arrest lines were used to determine the ratio of crack width to crack depth in Vickers indented specimens. For the initial crack depth, images of fracture surfaces were taken using an scanning electron microscope. Furthermore, the influence of humidity and temperature on the failure stress of unindented specimens with a constant initial crack length was simulated.

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Advancing the Mechanical Performance of Glasses: Perspectives and Challenges

et al. 2022

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in terms of deciphering structure-property relationships and the nonaffine nature of glass mechanical behavior, of computational and computer-assisted methods for accelerated materials discovery, and of physicochemical insight at glass formation and synthesis in unconventional types of materials. Despite this progress, significant questions remain as to the fundamental role of structural heterogeneity and its consequences for the predictability of mechanical properties underlying the many applications of glass. Today's challenge is to translate new understanding of the physics of disorder, glass chemistry, and surface mechanics into tools that enable future glass products with adapted elasticity, strength, and toughness. We will therefore consider fundamental advances in relation to emerging glass applications. While the aforementioned physical insights have mostly been obtained by computational simulation of model systems, and often through the examination of metallic glasses, we will here focus on glasses suitable for visible transparency, in particular silicate glasses, such as a representative of today's most prolific glass devices, ranging from ultrathin substrates to strong and visually transparent cover materials. We will further consider hybrid glasses and glass-like composite materials as emerging alternatives that may overcome the ubiquitous conflict between strength and toughness. [1] Glasses are materials that lack a crystalline microstructure and long-range atomic order. Instead, they feature heterogeneity and disorder on superstructural scales, which have profound consequences for their elastic response, material strength, fracture toughness, and the characteristics of dynamic fracture. These structure-property relations present a rich field of study in fundamental glass physics and are also becoming increasingly important in the design of modern materials with improved mechanical performance. A first step in this direction involves glass-like materials that retain optical transparency and the haptics of classical glass products, while overcoming the limitations of brittleness. Among these, novel types of oxide glasses, hybrid glasses, phase-separated glasses, and bioinspired glass-polymer composites hold significant promise. Such materials are designed from the bottom-up, building on structure-property relations, modeling of stresses and strains at relevant length scales, and machine learning predictions. Their fabrication requires a more scientifically driven approach to materials design and processing, building on the physics of structural disorder and its consequences for structural rearrangements, defect initiation, and dynamic fracture in response to mechanical load. In this article, a perspective is provided on this highly interdisciplinary field of research in terms of its most recent challenges and opportunities.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.202109029.

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Statistical analysis of propagation rates of indentation-induced radial cracks in soda-lime-silica glass

Cited by 6 publications

References 49 publications

Automated Analysis of Slow Crack Growth in Hydrous Soda-Lime Silicate Glasses

Automated Analysis of Slow Crack Growth in Hydrous Soda-Lime Silicate Glasses

Subcritical crack growth parameters in glass as a function of environmental conditions

Advancing the Mechanical Performance of Glasses: Perspectives and Challenges

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