Indentation cracking in silicate glasses is directed by shear flow, not by densification

Kéryvin, Vincent; Rosales-Sosa, Gustavo A.; Kermouche, Guillaume

doi:10.1016/j.actamat.2020.05.011

Cited by 24 publications

(16 citation statements)

References 41 publications

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“…Yoshida's method has been widely applied in indentation studies, [24][25][26][27][28][29][30][31][32][33] and numerous developments 12 have been achieved regarding the indentation-induced volume and structure evolution. Nevertheless, as stated by one recent study, 34 it remains challenging to accurately determine the amplitude of the blister field during the indentation process. Moreover, recent developments [35][36][37] using molecular dynamic (MD) simulations of indentation provide convincing structural evidence from the atomic scale, while the better volume quantification from experiments is crucial for further developments in MD simulations.…”

Section: Introductionmentioning

confidence: 99%

Lateral‐pushing induced surface lift‐up during nanoindentation of silicate glass

Ding

Yang

et al. 2021

J Am Ceram Soc.

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Shear flow and/or densification have been long considered as the main mechanisms accounting for inelastic deformation during indentation of silicate glasses. However, the role of inelastic deformation during indentation of silicate glass is still debated. In this work, the cube-corner indenter was chosen to perform the nano-indentation tests on four different types of silicate glasses with a penetration depth of up to 0.5 μm. A 3D surface analysis method is developed to quantify the amplitude of the impression field. Based on this newly developed analysis approach, we have found that the shear flow and densification induced inelastic deformation of silicate glasses are visible as indentation, as pile-up close to the indent, and as lift-up far away from the indent. The lift-up mechanism is revealed for the first time, which complements the previous well-accepted pileup description. The lift-up region is due to the increasing width of the indenter as it is pushed into the glass, which corresponds to the amount of glass volume pushed away laterally (lateral-pushing) and can contribute up to ∼25% of the total volume above the original surface in soda-lime silicate glass. We believe that this better quantification of inelastic deformation will contribute to reveal the structural evolution during nano-indentation of silicate glass.

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Section: Introductionmentioning

confidence: 99%

Lateral‐pushing induced surface lift‐up during nanoindentation of silicate glass

Ding

Yang

et al. 2021

J Am Ceram Soc.

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“…Such simulations have very recently helped to understand glass hardness and the pertinent deformation routes. [148] To account for stress discontinuities, and further to allow for an improved description of crack branching as relevant for frangibility (Sections 5 and 6), peridynamics simulations are an attractive alternative to FEM. [149] Similar to FEM, they require input from material properties, but do not involve a mesh and are, therefore, scale invariant.…”

Section: Finite Element and Peridynamics Simulation Methodsmentioning

confidence: 99%

“…Such simulations have very recently helped to understand glass hardness and the pertinent deformation routes. [ 148 ]…”

Section: Computational Studies Of Glass Mechanical Behaviormentioning

confidence: 99%

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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“…16 Glasses exhibit several behaviors under indentation, including reversible elastic deformation, fracture, volumeconservative shear flow, and permanent densification. 17,18 Understanding the mechanism, magnitude, and localization of these deformation processes requires an accurate knowledge of the stress field that is generated under the tip upon indentation, which is challenging to access experimentally, especially in real-time. 19,20 These difficulties have inhibited a deep understanding of the behavior of glasses during indentation.…”

Section: Introductionmentioning

confidence: 99%

Modeling the nanoindentation response of silicate glasses by peridynamic simulations

et al. 2021

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Nanoindentation is a widely used method to probe the mechanical properties of glasses. However, interpreting glasses' response to nanoindentation can be challenging due to the complex nature of the stress field under the indenter tip and the lack of in situ characterization techniques. Here, we present a numerical model describing the nanoindentation of an archetypical soda-lime silicate window glass by means of peridynamic simulations. We show that, although it does not capture shear flow and permanent densification, peridynamics exhibits a good agreement with experimental nanoindentation data and offers a direct access to the stress field forming under the indenter tip.

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Indentation cracking in silicate glasses is directed by shear flow, not by densification

Cited by 24 publications

References 41 publications

Lateral‐pushing induced surface lift‐up during nanoindentation of silicate glass

Lateral‐pushing induced surface lift‐up during nanoindentation of silicate glass

Advancing the Mechanical Performance of Glasses: Perspectives and Challenges

Modeling the nanoindentation response of silicate glasses by peridynamic simulations

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