Elementary plastic events in a Zachariasen glass under shear and pressure

Bamer, Franz; Ebrahem, Firaz; Markert, Bernd

doi:10.1016/j.mtla.2019.100556

Cited by 22 publications

(17 citation statements)

References 65 publications

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“…The tensile test is performed using classical molecular dynamics simulation in LAMMPS and the athermal quasistatic deformation (AQS) method proposed in [9] and [10] and the Yukawa-type potential function [11]. At the initial state, each sample is subjected to athermal relaxation cf.…”

Section: Simulation Methodsmentioning

confidence: 99%

“…A number of 75 samples of amorphous MLS is generated using the dual bond-switching algorithm as described in [9] and [10]. Starting from a hexagonal network structure, the algorithm rotates randomly chosen O-bonds and, thus, changes the size n of a growing number of rings to a value other than 6 until a target ring size distributions 2 = h s 2 m is reached.…”

Section: Simulation Methodsmentioning

confidence: 99%

“…In this contribution, we compute PRs of an amorphous network material at the example of amorphous MLS, which is build of a network of 4-to 9-membered rings. Hereby, we vary the network's heterogeneity, i.e., the variance of the ring size distribution around the mean ring size of n = 6 [9].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Section: Simulation Methodsmentioning

confidence: 99%

Section: Simulation Methodsmentioning

confidence: 99%

See 1 more Smart Citation

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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“…Using LAMMPS, each sample is subjected to athermal relaxation to reduce construction-related stress within the network before starting the x-tensile test. According to the athermal quasistatic deformation (AQS) method proposed in [4], each step of the tensile test consists of three stages. Firstly, the sample is stretched in x-direction while keeping the box height (y-direction) fixed.…”

Section: Simulation Methodsmentioning

confidence: 99%

Numerical investigation of the Poisson's ratio of an amorphous bilayer 2D network material

Stratmann

Bamer

Kataria

et al. 2021

Proc Appl Math & Mech

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This paper investigates the transverse contraction of amorphous bilayer 2D Silica with varying network heterogeneities under uniaxial tensile loading using athermal molecular simulations in LAMMPS. It turns out that the transverse contraction increases nonlinearly with the x‐strain while it decreases with increasing network heterogeneity. We show that it is possible to engineer the heterogeneity of amorphous network materials, making them potential candidates for nano‐electromechanical applications.

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“…However, the fundamental mechanism of these two types of elementary plastic events in glasses is, to this date, not fully resolved. In particular, for network glasses, such as vitreous silica, there is a lack of knowledge about the microscopic deformation mechanism, although these types of glasses can be well defined through their network topology, which is, in two dimensions, governed by corner-sharing SiO 3 triangles [26][27][28].…”

mentioning

confidence: 99%

Origin of reversible and irreversible atomic-scale rearrangements in a model two-dimensional network glass

Ebrahem,

Bamer,

Markert

2020

Preprint

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In this contribution, we investigate the fundamental mechanism of plasticity in a model 2D network glass. The glass is generated using a Monte Carlo bond-switching algorithm and subjected to athermal simple shear deformation, followed by subsequent unloading at selected deformation states. This enables us to investigate the topological origin of reversible and irreversible atomic-scale rearrangements. It is shown that some events that are triggered during loading recover during unloading, while some do not. Thus, two kinds of elementary plastic events are observed, which can be linked to the network topology of the model glass.

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Elementary plastic events in a Zachariasen glass under shear and pressure

Cited by 22 publications

References 65 publications

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

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

Numerical investigation of the Poisson's ratio of an amorphous bilayer 2D network material

Origin of reversible and irreversible atomic-scale rearrangements in a model two-dimensional network glass

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