On the size-dependent critical stress intensity factor of confined brittle nanofilms

Sakib, A R Nazmus; Adnan, Ashfaq

doi:10.1016/j.engfracmech.2012.02.003

Cited by 17 publications

(4 citation statements)

References 25 publications

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“…Therefore, it is conjectured that the discrepancy between the G c and R can be attributed to the effect of crack growth. In addition, the G c is slightly smaller than 2γ s , which is in good agreement with previous studies on fracture properties of single crystal Cu and NaCl [17,41,42].…”

Section: Evaluation Of the R-curvesupporting

confidence: 92%

R-curve Evaluation of Copper and Nickel Single Crystals Using Atomistic Simulations

2018

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The technique of molecular statics (MS) simulation was employed to determine the crack growth resistance curve of Cu and Ni single crystals. Copper and Ni single crystal nanoplates with an edge crack subjected to a tensile displacement were simulated. Stress-displacement curves and snapshots of the atomic configuration corresponding to different displacement levels were presented to elucidate the deformation mechanism. It was observed that the edge crack propagated step by step in a brittle manner, and the amount of crack growth at each step was half the lattice parameter. Through an energy consideration, the critical strain energy release rate at the onset of crack propagation and the crack growth resistance were calculated. The crack growth resistance is larger than the critical strain energy release rate because of the crack growth effect.

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Section: Evaluation Of the R-curvesupporting

confidence: 92%

R-curve Evaluation of Copper and Nickel Single Crystals Using Atomistic Simulations

2018

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“…Recently, many researchers have used the classical Griffith’s theory to investigate the brittle fracture behaviour of different materials in order to estimate Gc and Kc [18,19,20,21,22,23,24,25,26,27,28]. Recently, several works were carried out in MD simulations to estimate Gc and Kc and to understand the effect of the crack depth on the onset of crack, whereas comparisons with Griffith’s theory were carried out [22,50,51,52,53,54]. These studies provided two significant conclusions; First, for extremely small size crack, Griffith’s theory of fracture becomes inapplicable, and second, LEFM only can be used when the crack depth is at least four times of the material’s lattice constant.…”

Section: Fracture Mechanical Propertiesmentioning

confidence: 99%

A Review on Brittle Fracture Nanomechanics by All-Atom Simulations

Patil

Heider

2019

Nanomaterials

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Despite a wide range of current and potential applications, one primary concern of brittle materials is their sudden and swift collapse. This failure phenomenon exhibits an inability of the materials to sustain tension stresses in a predictable and reliable manner. However, advances in the field of fracture mechanics, especially at the nanoscale, have contributed to the understanding of the material response and failure nature to predict most of the potential dangers. In the following contribution, a comprehensive review is carried out on molecular dynamics (MD) simulations of brittle fracture, wherein the method provides new data and exciting insights into fracture mechanism that cannot be obtained easily from theories or experiments on other scales. In the present review, an abstract introduction to MD simulations, advantages, current limitations and their applications to a range of brittle fracture problems are presented. Additionally, a brief discussion highlights the theoretical background of the macroscopic techniques, such as Griffith’s criterion, crack tip opening displacement, J-integral and other criteria that can be linked to the fracture mechanical properties at the nanoscale. The main focus of the review is on the recent advances in fracture analysis of highly brittle materials, such as carbon nanotubes, graphene, silicon carbide, amorphous silica, calcium carbonate and silica aerogel at the nanoscale. These materials are presented here due to their extraordinary mechanical properties and a wide scope of applications. The underlying review grants a more extensive unravelling of the fracture behaviour and mechanical properties at the nanoscale of brittle materials.

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“…When a nanocrack is embedded in a nanomaterial, the size-dependent fracture behavior is inevitable. ,− For instance, the degree of nonlinearity of the crack increases as the size of the nanomaterial decreases. − However, there are still few studies on how the size-dependent properties of nanomaterials influence the fracture behavior of the embedded cracks. Here, we address the size-dependent fracture behavior of (001) cracked metal nanoplates using molecular dynamics(MD) simulations.…”

Section: Introductionmentioning

confidence: 99%

Fracture Behavior Transition in (001) Cracked Metal Nanoplates Induced by the Surface Effect

Kim

2021

J. Phys. Chem. C

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In this study, we show that the fracture mode of (001) cracked metal nanoplates is strongly dependent on the size through molecular dynamics simulations. Cracked nanoplates with smaller sizes exhibit an elastic instabilitydominant fracture followed by a ductile behavior, whereas larger cracked nanoplates exhibit a brittle fracture. A brittle fracture is caused by an embedded crack, whereas the elastic instability-dominant fracture is due to a failure of the nanoplate by elastic instability, which is influenced by the surface effect. We provide numerical and theoretical evidence to show that the transition in the fracture behavior of a cracked metal nanoplate is due to the competition between the crack and the free surfaces.

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On the size-dependent critical stress intensity factor of confined brittle nanofilms

Cited by 17 publications

References 25 publications

R-curve Evaluation of Copper and Nickel Single Crystals Using Atomistic Simulations

R-curve Evaluation of Copper and Nickel Single Crystals Using Atomistic Simulations

A Review on Brittle Fracture Nanomechanics by All-Atom Simulations

Fracture Behavior Transition in (001) Cracked Metal Nanoplates Induced by the Surface Effect

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