Mechanics of Nano-Honeycomb Silica Structures: Size-Dependent Brittle-to-Ductile Transition

Sen, Dipanjan; Garcia, Andre P.; Buehler, Markus J.

doi:10.1061/(asce)nm.2153-5477.0000037

Cited by 24 publications

(22 citation statements)

References 22 publications

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“…Instead, for the structure with closed notch only single {113} plane dislocations and no necking transition were observed (Figure 12b). Additionally we suggest that a flaw tolerance related size effect [51][52][53] due to the high value of surface-to-volume ratio [54] may manifest in the single type dislocation/grain formation mechanisms observed in this study. Step formation mechanism for a 110 strained pre-oxidized fcc-Ni plate in vacuum (300K, ε lateral =const, ε=0.272).…”

Section: Resultsmentioning

confidence: 71%

Comparative molecular dynamics study of fcc-Ni nanoplate stress corrosion in water

Verners

Duin

2015

Surface Science

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Reactive molecular dynamics studies of stress corrosion properties of Ni metal nanoplate structures in pressurized water at different temperatures, chemical environments and mechanical boundary conditions have been performed. The results indicate reduction of dislocation nucleation barriers due to the water reactions on material surfaces, simulated loading rate and elevated temperature, resulting in reduction of material strength and ductility. It is also found that pre-oxidized surfaces yield increased initial dislocation nucleation barriers. Likewise, significant effects of stress triaxiality on strength, ductility and surface reactivity are also observed by comparison of boundary conditions. Size dependent structure failure modes and distributions of stress and strain have been explored. A possible Ni dissolution mechanism is identified and validated using DFT calculations and metadynamics simulations.

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Section: Resultsmentioning

confidence: 71%

Comparative molecular dynamics study of fcc-Ni nanoplate stress corrosion in water

Verners

Duin

2015

Surface Science

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“…Panel (b) shows the stress-strain curves for bulk silica and nanoporous silica, revealing a distinct material behavior. The introduction of nanoscale holes in silica yields a more ductile, highly dissipative response, as shown in reactive atomistic modeling [90,91]. Adapted from [89] and [90] …”

Section: H-bonds) the Question Examined Is Simple: Is It Possible Tomentioning

confidence: 97%

“…The structures and resulting stress-strain curves are shown in Fig. 3.12, obtained using reactive molecular dynamics [89][90][91]. These two building blocks were then assembled into different composite structures.…”

Section: H-bonds) the Question Examined Is Simple: Is It Possible Tomentioning

confidence: 99%

The Challenges of Biological Materials

Cranford

Buehler

2012

Biomateriomics

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The challenges of biological materials and systems-the inherent complexity-is a result of the diversity of Nature itself. The evolution of structure in biological materials is guided by the ever-changing requirements of the external environment and have resulted in materials with desirable engineering properties, such as high strength, toughness, adaptability, flaw tolerance, self-healing, mutability and multifunctionality, all with a limited set of-and frequently inferiorbuilding materials. As a result of such constraints, Nature implements a flexible material composed of a limited set of molecular components: soft, deformable, highly convoluted proteins, composed of a minute set of amino acids. Providing a common base, protein form and function has evolved intimately, such that even the prediction of folded structure from a known peptide sequence is a technological challenge. Potential functionality is extended through the use of structural hierarchies-resulting in system robustness, efficiency, and design tolerance-while decreasing the efficacy of any single-scale analysis. At the microscale, the complexity manifests as functional, growing, adaptable materials-producing "shaky" platforms for tissue engineering and growth. While biological and chemical cues may change across scales, mechanical insights can provide a common basis regardless of scale or analytical progression.Look deep into Nature, and then you will understand everything better.Albert Einstein (1879Einstein ( -1955

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“…Explicitly, the mechanics of nanostructured silica, inspired by diatom shells, were studied by Sen et al They found, via molecular dynamics‐ and nanomechanical simulations, that with decreasing strut sizes, transitions from brittle cracking to plastic deformation, and necking occur. There, crystal slip at defined values of the shear strength was found to be the origin of plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Compressive Behavior of Anisotropic, Nanometer‐Scale Structured Silica

Opdenbosch

Zollfrank

2019

Adv Eng Mater

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Recently, large plastic deformations were observed during compression testing of biotemplated, anisotropic, and hierarchically structured silica monoliths. Based on the material's nanometer-scale structuring, a dynamic model is devised in which parallel silica struts are compressed, and sheared in longitudinal direction. The resulting interfacial shear forces lead to successive plastic deformations during cyclic loading with incrementally increasing forces, matching observations by mechanical testing. The authors report on the physical parameter values obtained from fitting model curves to measured ones, their relation to prior structural observations, and their utility to tailor the intricate mechanical behavior of this novel material.

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Mechanics of Nano-Honeycomb Silica Structures: Size-Dependent Brittle-to-Ductile Transition

Cited by 24 publications

References 22 publications

Comparative molecular dynamics study of fcc-Ni nanoplate stress corrosion in water

Comparative molecular dynamics study of fcc-Ni nanoplate stress corrosion in water

The Challenges of Biological Materials

Modeling the Compressive Behavior of Anisotropic, Nanometer‐Scale Structured Silica

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