Stone–Wales defect interaction in quasistatically deformed 2D silica

Ebrahem, Firaz; Bamer, Franz; Markert, Bernd

doi:10.1007/s10853-019-04274-1

Cited by 16 publications

(11 citation statements)

References 79 publications

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“…Furthermore, the maximum stress and the maximum strain for each sample are different. The above results are all in line with studies on bulk silica, whose stress-strain relation has been shown to significantly depend on the network structure [2]. For each sample, we now focus on the first rearrangement associated with dissipative behaviour.…”

Section: Computational Detailssupporting

confidence: 85%

“…Finally, the switched monolayer is duplicated and the Si atoms of the upper and lower layers are bridged via O atoms yielding a vitreous silica bilayer. For the subsequent mechanical loading in three dimensions we use a Stillinger-Weber type potential function that has been used widely, and, shown to reproduce the structural arrangement and mechanical behaviour of both bulk [2][3][4] and 2D silica [5].…”

Section: Computational Detailsmentioning

confidence: 99%

“…Considerable efforts have been devoted to analyse 2D silica and provide further steps towards the understanding of the structural and mechanical properties that paves the way for possible applications [1]. From both experiments and molecular dynamics studies it is well known that the deformation and fracture behaviour of glasses strongly depend on the underlying network topology [2][3][4]. Atomic-scale rearrangements are, generally, accepted as the elementary events for plastic deformation in glasses [5].…”

Section: Introductionmentioning

confidence: 99%

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Stress response of 2D silica under quasi‐static tension

Ebrahem

Bamer

Markert

2019

Proc Appl Math and Mech

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We use classical molecular dynamics simulations to generate topologically different models of vitreous 2D silica, all of which are subjected to quasi-static tensile loading until fracture occurs. We demonstrate the effects of structural disorder on the material behaviour of 2D silica. For each sample, we determine the network structure by identifying the relative count of single rings and so-called ring triplets each of which composed of three adjacent rings that share a common corner. In each sample, we spatially detect the first local atomic-scale rearrangement during deformation and correlate it to the ring triplet involved.

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Section: Computational Detailssupporting

confidence: 85%

Section: Computational Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stress response of 2D silica under quasi‐static tension

Ebrahem

Bamer

Markert

2019

Proc Appl Math and Mech

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“…Negative Poisson's ratios (NPR) for three non-hexagonal, still crystalline β-, γ-, and δ-2D silica were found by [5] and [6]. The influence of one and two Stone-Wales defects in BLS on its mechanical response to tensile loading was shown in [7] and [8], respectively.…”

Section: Introductionmentioning

confidence: 95%

On the Poisson's ratio of an amorphous 2D network material

Stratmann

Ebrahem

Bamer

et al. 2021

Proc Appl Math and Mech

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Since Poisson's ratio has only been determined for crystalline forms of network materials, we investigate freestanding, amorphous monolayer 2D silica with varying ring size heterogeneity under tensile stress. Compared to the crystalline material, the relation between x-and y-strain is slightly nonlinear. Thus, the Poisson's ratio is not constant, but a strongly oscillating function of the x-strain. With increasing level of heterogeneity, the Poisson's ratio of the material decreases.

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“…Glass fibre mainly consists of SiO 2 , Al 2 O 3 , and CaO. Every four silicon ions combine with one oxygen ion to form a tetrahedron [SiO 4 ] [7][8][9][10][11], which is the basic structural unit of glass fibre. The [SiO 4 ] tetrahedrons are connected through bridge oxygens, with different types of connections resulting in different forms of siliconoxygen skeletons.…”

Section: Analysis Of Rtp Fatigue Failure Using Chemical Bond Theorymentioning

confidence: 99%

Study on fatigue failure of glass fibre-reinforced thermoplastic pipe

Wang

Zhang

Wang

2020

Mater. Res. Express

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The long-term fatigue performance of a glass fibre-reinforced thermoplastic pipe (RTP) is mainly determined by that of its glass fibre reinforcement layer. Glass fibre has an irregular network structure consisting of SiO 4 tetrahedrons. In this network structure, there exists numerous defects. Under cyclic loading, cracks are initiated at these defects and grow steadily and perhaps even disruptively, ultimately leading to the fracture of the glass fibre. The mean stress corresponding to the occurrence of disruptive crack propagation is referred to as the critical fatigue stress. When the mean cyclic load is smaller than the critical value, the growing cracks stop propagating when in contact with high-energy chemical bonds. When the mean cyclic load is larger than the critical value, the glass fibre is doomed to fracture. In the present study, a series of fatigue tests was performed on a RTP subjected to cyclic loadings of different mean stresses. The numbers of cycles to failure at different mean stresses obtained from the tests were then used to estimate the critical fatigue stress of the RTP. The mechanism underlying the fatigue failure was analysed using fatigue mechanics and chemical bond theories. Test Testing materialsGlass fibre strip: Glass fibre bundles were wetted via soaking in a batch solution and then baked dry in an oven. The pre-treated bundles were bonded with molten HDPE in a mould. The resulting composite material was rolled into strips. The glass fibre (2400 TEX) measured 0.6 mm in thickness and had a density of 1.3373 g cm −3 and vertical fracture stress of 300 MPa.

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Stone–Wales defect interaction in quasistatically deformed 2D silica

Cited by 16 publications

References 79 publications

Stress response of 2D silica under quasi‐static tension

Stress response of 2D silica under quasi‐static tension

On the Poisson's ratio of an amorphous 2D network material

Study on fatigue failure of glass fibre-reinforced thermoplastic pipe

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