Indentation densification of fused silica assessed by raman spectroscopy and constitutive finite element analysis

Bruns, Sebastian; Uesbeck, Tobias; Fuhrmann, Sindy; Aymerich, Mariona Tarragó; Wondraczek, Lothar; Ligny, Dominique de; Durst, Karsten

doi:10.1111/jace.17024

Cited by 25 publications

(28 citation statements)

References 54 publications

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“…Due to a large tip radius, surface detection for the Vickers indenter was found to match FEA without correction. The conical indenter, with a smaller tip radius, was found to offset experimental curves by a displacement which correlates to nano‐indentation results for indenter depth at the surface detection force (10 ± 2 mN) 44 . The FEA simulations are identical to those in Figure 6 and Figure .…”

Section: Resultssupporting

confidence: 67%

“…For FEA, force vs depth curves are a common method of experimental validation, as they are automatically generated during instrumented indentation 40–45,64–67 . Figure 7 displays a comparison of force vs depth curves obtained experimentally and simulated with FEA.…”

Section: Resultsmentioning

confidence: 99%

“…As these FEA models feature a rigid indenter, tip radius is the only difference between the sapphire conical and diamond Vickers simulations (Figure 3) [Color figure can be viewed at wileyonlinelibrary.com] during instrumented indentation. [40][41][42][43][44][45][64][65][66][67] Figure 7 displays a comparison of force vs depth curves obtained experimentally and simulated with FEA.…”

Section: F I G U R Ementioning

confidence: 99%

“…36,37 In 1996, Lambropoulis et al published a constitutive model for the densification of fused silica. 38 Since then, researchers have proposed additional constitutive models, [39][40][41][42][43][44] with some recent work combining molecular dynamics (MD) simulations and experimental validation to create detailed yield surfaces. 45,46 These models allow for yielding in hydrostatic densification, isochoric shear, and combinations thereof.…”

Section: Introductionmentioning

confidence: 99%

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Sharp indentation stress fields in fused silica: Finite element analysis and Yoffe analytic model

2020

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The closed-form Yoffe analytic model (1982), which superimposes two linear-elastic stress fields, was developed as a first approximation to quantify the mechanical response of silicate glasses to sharp indentation. However, a detailed study with both experimental validation and numerical verification has yet to be published. This paper presents such a study, wherein experimental observation of crack systems in fused silica and numerical results from finite element analysis (FEA) are used to demonstrate the limitations of this analytic superimposition model. Specifically, analytic stress fields deviate from FEA numerical results and are inconsistent with several commonly observed crack systems. In contrast, FEA generated stress fields are entirely consistent with experimentally observed crack systems. Upon further investigation, it was found that the analytic model, with one tunable parameter, could

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Section: Resultssupporting

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Section: F I G U R Ementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sharp indentation stress fields in fused silica: Finite element analysis and Yoffe analytic model

2020

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“…2), which is diagnostic for fused quartz. [30][31][32] SIMS results. The SIMS oxygen isotope data of NBS-28 quartz, Qinghu-Qtz and Glass-Qtz for the homogenization test are presented in Appendix S1 and visualized in Fig.…”

Section: Resultsmentioning

confidence: 99%

New Natural and Fused Quartz Reference Materials for Oxygen Isotope Microanalysis

Tang¹,

Liu²,

Li³

et al. 2020

At.Spectrosc.

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Silicon dioxide (SiO2) occurs as both crystallized quartz and amorphous quartz, and their oxygen isotope is widely used to trace the source of hydrothermal fluids, to reconstruct paleotemperature of oceans and to provide genetic constraints on petrogenetic studies. Precise and accurate oxygen isotope analysis, therefore, is fundamental for the application of oxygen isotope study. Secondary Ion Mass Spectrometry (SIMS) is capable of obtaining oxygen isotope information at micron levels, but precise and accurate SIMS isotopic microanalysis requires high quality reference materials to correct instrumental mass fractionation and to monitor data quality. In this study, we report two reference materials, a natural crystallized quartz (Qinghu-Qtz) from Qinghu quartz monzonite (Guangdong, P.R. China) and a fused amorphous quartz (Glass-Qtz). Multiple SIMS analyses suggest that both Qinghu-Qtz and Glass-Qtz are homogeneous in terms of oxygen isotope composition at ca. 20 µm level, with a two-standard deviation of 0.50 ‰ (N = 1083) and 0.22 ‰ (N = 283), respectively. In comparison, the widely utilized NBS-28 quartz reference material, designed for bulk analysis, is less homogeneous at micro levels. The δ 18 OVSMOW values of the two reference materials were obtained by conventional fluorination isotope ratio mass spectrometry (IRMS) and the recommended δ 18 OVSMOW values were 8.49 ± 0.20 ‰ (Qinghu-Qtz, 2 SD, N = 12) and 1.68 ± 0.08 ‰ (Glass-Qtz, 2 SD, N = 10).

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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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Indentation densification of fused silica assessed by raman spectroscopy and constitutive finite element analysis

Cited by 25 publications

References 54 publications

Sharp indentation stress fields in fused silica: Finite element analysis and Yoffe analytic model

Sharp indentation stress fields in fused silica: Finite element analysis and Yoffe analytic model

New Natural and Fused Quartz Reference Materials for Oxygen Isotope Microanalysis

Advancing the Mechanical Performance of Glasses: Perspectives and Challenges

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