A molecular dynamics study of void interaction in copper

Xu, Shuozhi; Hao, Zulong; Wan, Qiang

doi:10.1088/1757-899x/10/1/012175

Cited by 9 publications

(7 citation statements)

References 8 publications

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“…In establishing the initial configuration for the void growth problem, one of the most important geometric factors -among specimen size, porosity, and lattice orientations -is the void shape. For simplicity, most theoretical and computational work assume circular or spherical voids [25]. Recent studies found that, however, an initially circular void can deform to an elliptic shape of the same volume subject to either radiation damage or dislocation glide [26].…”

Section: Introductionmentioning

confidence: 99%

On the role of initial void geometry in plastic deformation of metallic thin films: A molecular dynamics study

2016

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

On the role of initial void geometry in plastic deformation of metallic thin films: A molecular dynamics study

2016

Materials Science and Engineering: A

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“…Nano/micro-scale voids play an important role in ductile fracture of metallic materials [1]. Subject to tensile loading, voids nucleate from "hot spots" in an otherwise void-free metal, e.g., grain boundaries, precipitate/matrix interfaces; then voids grow and coalesce with each other, forming macroscopically observable cracks and eventually resulting in failure of the material [2].…”

Section: Introductionmentioning

confidence: 99%

“…Compared with face-centered cubic (FCC) [1,10,12] and body-centered cubic (BCC) [9,2,11] systems, there exist much fewer studies of nanvoids in metals with a hexagonal close-packed (HCP) lattice, in part due to a lack of reliable interatomic potential and more complicated slip/twinning systems in the latter. Particularly for HCP Mg, the lightest and the third most abundant element in the Earth's crust among all metals, most atomistic simulations in the literature concerned nanocracks [16,17,18,19]; to the best of our knowledge, only a few MD and atomistic-based multiscale studies have been devoted to nanovoids [20,21,22].…”

Section: Introductionmentioning

confidence: 99%

Deformation of periodic nanovoid structures in Mg single crystals

Chavoshi

2018

Mater. Res. Express

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Abstract. Large scale molecular dynamics (MD) simulations in Mg single crystal containing periodic cylindrical voids subject to uniaxial tension along the z direction are carried out. Models with different initial void sizes and crystallographic orientations are explored using two interatomic potentials. It is found that (i) a larger initial void always leads to a lower yield stress, in agreement with an analytic prediction; (ii) orientations, the two potentials identically predict the nucleation of edge dislocations on the prismatic plane, which then glide away from the void, resulting in extrusions at the void surface; in the case of the smallest initial void, these surface extrusions pinch the void into two voids. Besides bringing new physical understanding of the nanovoid structures, our work highlights the variability and uncertainty in MD simulations arising from the interatomic potential, an issue relatively lightly addressed in the literature to date.

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“…The existence of voids also contributes to the hardening of metals by impeding dislocation migration [3]. As the continuum models of void growth and associated dislocation nucleation are very sensitive to the choice of various parameters and criteria (e.g., dislocation nucleation criteria and dissociation of dislocations) [4,5], atomistic methods such as molecular dynamics (MD) become the natural framework to understand the plastic response of voided metallic materials at the nano-scale [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Plastic deformation of Cu single crystals containing an elliptic cylindrical void

Chen

et al. 2017

Materials Letters

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Molecular dynamics simulations are performed to study the plastic deformation of Cu single crystals containing an elliptic cylindrical void. The effects of initial void geometry including void ellipticity and void orientation angle on plastic deformation are examined by considering the stress-strain response, dislocation nucleation from the void surface, and porosity/void cross-sectional shape evolution. It is found that (i) the initial void geometry plays an important role and (ii) the growth of voids with an increasing initial ellipticity converges to that of a crack. Our results reveal the underlying mechanisms of initial void ellipticity-and orientation angle-dependent plastic deformation of metallic solids, and provide direct evidence that there is no dividing line between a void and a crack in terms of the mechanical responses of these solids.

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A molecular dynamics study of void interaction in copper

Cited by 9 publications

References 8 publications

On the role of initial void geometry in plastic deformation of metallic thin films: A molecular dynamics study

On the role of initial void geometry in plastic deformation of metallic thin films: A molecular dynamics study

Deformation of periodic nanovoid structures in Mg single crystals

Plastic deformation of Cu single crystals containing an elliptic cylindrical void

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