Nanoscale damage during fracture in silica glass

Bonamy, Daniel; Prades, Silke; Rountree, Cindy; Ponson, Laurent; Dalmas, Davy; Bouchaud, Élisabeth; Ravi‐Chandar, K.; Guillot, Claude

doi:10.1007/s10704-006-6579-2

Cited by 58 publications

(48 citation statements)

References 33 publications

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“…Although no clear signs of dislocation or shear band nucleation are observed, the initial mechanisms of cavity nucleation are consistent with other MD simulations and experimental studies of silica deformation. [30,46] Previous studies on small diameter nanowires (similar in size to those in our study) have determined that the mechanism of yielding by dislocation is absent, and demonstrated that the main mechanical instability is a disorder-order transformation, resulting in the reduction in size of the nanowire neck until single atom chains emerge. [24,47] We proceed with analysis of the silica meshes, as shown in Figure 5, which shows the equivalent von Mises stress field at the maximum stress.…”

Section: Resultssupporting

confidence: 72%

“…The fracture toughness of bulk vitreous silica was determined to be approximately 0.8 MPa m 1/2 . [29] The failure mechanisms occurring within the process zone at the crack tip in amorphous silica glass were studied by Bonamy et al [30] By implementing AFM experiments and MD simulations, the authors found that nucleation and growth of cavities are the dominant mechanism for failure within the process zone.…”

Section: Introductionmentioning

confidence: 99%

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Hierarchical Silica Nanostructures Inspired by Diatom Algae Yield Superior Deformability, Toughness, and Strength

Garcia

Sen

Buehler

2011

Metall Mater Trans A

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A universal design paradigm in biology is the use of hierarchies, which is evident in the structure of proteins, cells, tissues, and organisms, as well as outside the material realm in the design of signaling networks in complex organs such as the brain. A fascinating example of a biological structure is that of diatoms, a microscopic mineralized algae that is mainly composed of amorphous silica, which features a hierarchical structure that ranges from the nano-to the macroscale. Here, we use the porous structure found at submicron length scales in diatom algae as a basis to study a bioinspired nanoporous material implemented in crystalline silica. We consider the mechanical performance of two nanoscale levels of hierarchy, studying an array of thin-walled foil silica structures and a hierarchical arrangement of foil elements into a porous silica mesh structure. By comparing their elastic, plastic, and failure mechanisms under tensile deformation, we elucidate the impact of hierarchies and the wall width of constituting silica foils on the mechanical properties, by carrying out a series of large-scale molecular dynamics (MD) simulations with the first principles based reactive force field ReaxFF. We find that by controlling the wall width and by increasing the level of hierarchy of the nanostructure from a foil to a mesh, it is possible to significantly enhance the mechanical response of the material, creating a highly deformable, strong, and extremely tough material that can be stretched in excess of 100 pct strain, in stark contrast to the characteristic brittle performance of bulk silica. We find that concurrent mechanisms of shearing and crack arrest lead to an enhanced toughness and are enabled through the hierarchical assembly of foil elements into a mesh structure, which could not be achieved in foil structures alone. Our results demonstrate that including higher levels of hierarchy are beneficial in improving the mechanical properties and deformability of intrinsically brittle materials. The findings reported here provide insight into general material design approaches that may enable us to transform a brittle material such as silicon or silica into a ductile, yet strong and tough material, solely through alterations of its structural arrangement at the nanoscale.

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Section: Resultssupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Hierarchical Silica Nanostructures Inspired by Diatom Algae Yield Superior Deformability, Toughness, and Strength

Garcia

Sen

Buehler

2011

Metall Mater Trans A

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“…The same water weakening mechanism is known to be responsible for high rates of subcritical crack growth in siliceous minerals and glasses (Lawn, 1993). Recent studies suggest that even in the brittle, subcritical fracture of siliceous glass at room temperature there is a plastic process zone affected by water (Bonamy et al, 2006). A suggested mechanism applicable to salts (Skvortsova, 2004) and other minerals (Traskin, 2009;Traskin et al, 1998) is the so-called Rehbinder effect (Rehbinder and Shchukin, 1972).…”

Section: -1-1-1 Plasticity: Naclmentioning

confidence: 99%

The Role of Pressure Solution Creep in the Ductility of the Earth’s Upper Crust

Gratier

Dysthe

Renard

2013

Advances in Geophysics

239

274

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The aim of this review is to characterize the role of pressure solution creep in the ductility of the Earth's upper crust and to describe how this creep mechanism competes and interacts with other deformation mechanisms. Pressure solution creep is a major mechanism of ductile deformation of the upper crust, accommodating basin compaction, folding, shear zone development, and fault creep and interseismic healing. However, its kinetics is strongly dependent on the composition of the rocks (mainly the presence of phyllosilicates minerals that activate pressure solution) and on its interaction with fracturing and healing processes (that activate and slow down pressure solution, respectively).The present review combines three approaches: natural observations, theoretical developments, and laboratory experiments. Natural observations can be used to identify the pressure solution markers necessary to evaluate creep law parameters, such as the nature of the material, the temperature and stress conditions or the geometry of mass transfer domains. Theoretical developments help to investigate the thermodynamics and kinetics of the processes and to build theoretical creep laws.Laboratory experiments are implemented in order to test the models and to measure creep law parameters such as driving forces and kinetic coefficients. Finally, applications are discussed for the modelling of sedimentary basin compaction and fault creep. The sensitivity of the models to time is given particular attention: viscous versus plastic rheology during sediment compaction; steady state versus non-steady state behaviour of fault and shear zones. The conclusions discuss recent advances for modelling pressure solution creep and the main questions that remain to be solved. -IntroductionIn order to investigate the role of pressure solution creep in the ductility of the Earth's upper crust the various mechanical behaviour patterns of the upper crust must first be discussed. Two types of approach can be considered on this topic.1 -The mechanical behaviour of the upper crust is modelled using brittle theories, that include friction laws (Byerlee, 1978;Marone, 1998). This modelling approach is supported by two kinds of observations: (i) the maximum frequency of earthquakes is located within the first 15-20 km of the upper crust (Chen and Molnar, 1983;Sibson, 1982); (ii) laboratory experiments run at relatively fast strain-rates (faster than 10 -7 s -1 ) indicate a transition from frictional to plastic deformation at pressure and temperature conditions appropriate for a depth of 10-20 km (Kohlstedt et al., 1995;Paterson, 1978;Poirier, 1985).2 -Conversely, the behaviour of the upper crust is also modelled by ductile behaviour with creep laws (Wheeler, 1992). This modelling approach is supported by two kinds of observations: (i) geological structures exhumed from depth, such as compacted basin, folds and shear zones, and regional cleavage, indicate ductile behaviour throughout the upper crust (Argand, 1924;Hauck et al., 1998;Schmidt et al., 1996) (Fig. ...

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“…the scale between the size of a silica tetrahedron and on the order of 10-100 nm [165][166][167][168] depending on the chemical composition of the glass) of the glasses dictates stress corrosion cracking in Region I. Methods that highlight mesoscopic features, such as the DP Total , may be beneficial in the study of β c .…”

Section: Change In the V Versus K I In Region I As A Functionmentioning

confidence: 99%

Recent progress to understand stress corrosion cracking in sodium borosilicate glasses: linking the chemical composition to structural, physical and fracture properties

Rountree¹

2017

J. Phys. D: Appl. Phys.

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Recent IntroductionOxide glasses are among the oldest industrial materials known to man, and they are widely used due to their advantageous properties: transparency, low thermal expansion, high melting point temperature, relative inertness, etc. Yet, oxide glasses are not without significant shortcomings. In par ticular, they remain inherently brittle, despite significant scientific ingenuity to overcome this drawback. Moreover, they undergo abrupt catastrophic failure. Frequently, post-mortem failure studies reveal material flaws which were propagating via stress corrosion cracking. Understanding and predicting the growth of such flaws under sub-critical crack propagation remains a hurdle for scientists. Furthermore, how the basic glass network (i.e. the interconnect of the glass structure) dictates the physical, mechanical and stress corrosion cracking AbstractThis topical review is dedicated to understanding stress corrosion cracking in oxide glasses and specifically the SiO 2 B 2 O 3 Na 2 O (SBN) ternary glass systems. Many review papers already exist on the topic of stress corrosion cracking in complex oxide glasses or overly simplified glasses (pure silica). These papers look at how systematically controlling environmental factors (pH, temperature...) alter stress corrosion cracking, while maintaining the same type of glass sample. Many questions still exist, including: What sets the environmental limit? What sets the velocity versus stress intensity factor in the slow stress corrosion regime (Region I)? Can researchers optimize these two effects to enhance a glass' resistance to failure? To help answer these questions, this review takes a different approach. It looks at how systemically controlling the glass' chemical composition alters the structure and physical properties. These changes are then compared and contrasted to the fracture toughness and the stress corrosion cracking properties. By taking this holistic approach, researchers can begin to understand the controlling factors in stress corrosion cracking and how to optimize glasses via the initial chemical composition.

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Nanoscale damage during fracture in silica glass

Cited by 58 publications

References 33 publications

Hierarchical Silica Nanostructures Inspired by Diatom Algae Yield Superior Deformability, Toughness, and Strength

Hierarchical Silica Nanostructures Inspired by Diatom Algae Yield Superior Deformability, Toughness, and Strength

The Role of Pressure Solution Creep in the Ductility of the Earth’s Upper Crust

Recent progress to understand stress corrosion cracking in sodium borosilicate glasses: linking the chemical composition to structural, physical and fracture properties

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