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Defect sensitivity of single-crystal nano-sized Cu beams

Melin, Solveig LU ; Hansson, Per LU and Ahadi, Aylin LU (2016) In Procedia Structural Integrity 2. p.1351-1358
Abstract
Molecular dynamics simulations of nano-sized beams with square cross sections of single-crystal Cu, solid as well as holding defects and loaded in displacement controlled tension until rupture have been performed. The defects are either edge crack-like or through-the-thickness voids. Three different cross section sizes and two different crystallographic orientations have been investigated. As expected, both geometry and crystal orientation influence the mechanical behavior. The strain at plastic initiation was, however, found almost independent of cross section size at given geometry and crystal orientation. Not surprisingly, the presence of defects lowers the strain at both plastic initiation and at rupture. More surprising is that... (More)
Molecular dynamics simulations of nano-sized beams with square cross sections of single-crystal Cu, solid as well as holding defects and loaded in displacement controlled tension until rupture have been performed. The defects are either edge crack-like or through-the-thickness voids. Three different cross section sizes and two different crystallographic orientations have been investigated. As expected, both geometry and crystal orientation influence the mechanical behavior. The strain at plastic initiation was, however, found almost independent of cross section size at given geometry and crystal orientation. Not surprisingly, the presence of defects lowers the strain at both plastic initiation and at rupture. More surprising is that embedded through-the-thickness voids under some circumstances might close to heal the beam cross section. The healing process seems to strengthen the beam and delay the final rupture. This applies for thin enough beams, allowing strong enough interatomic forces over the void, assisted by pertinent slip events. (Less)
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; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Defect nano-beams, single-crystal Cu, void closure, tensile nano-beams
in
Procedia Structural Integrity
volume
2
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:85064719021
ISSN
2452-3216
DOI
10.1016/j.prostr.2016.06.172
language
Swedish
LU publication?
yes
id
bb9de705-704a-48dd-8ff6-925b314d8cc9
date added to LUP
2019-03-29 11:29:22
date last changed
2022-03-02 20:59:13
@article{bb9de705-704a-48dd-8ff6-925b314d8cc9,
  abstract     = {{Molecular dynamics simulations of nano-sized beams with square cross sections of single-crystal Cu, solid as well as holding defects and loaded in displacement controlled tension until rupture have been performed. The defects are either edge crack-like or through-the-thickness voids. Three different cross section sizes and two different crystallographic orientations have been investigated. As expected, both geometry and crystal orientation influence the mechanical behavior. The strain at plastic initiation was, however, found almost independent of cross section size at given geometry and crystal orientation. Not surprisingly, the presence of defects lowers the strain at both plastic initiation and at rupture. More surprising is that embedded through-the-thickness voids under some circumstances might close to heal the beam cross section. The healing process seems to strengthen the beam and delay the final rupture. This applies for thin enough beams, allowing strong enough interatomic forces over the void, assisted by pertinent slip events.}},
  author       = {{Melin, Solveig and Hansson, Per and Ahadi, Aylin}},
  issn         = {{2452-3216}},
  keywords     = {{Defect nano-beams; single-crystal Cu; void closure; tensile nano-beams}},
  language     = {{swe}},
  pages        = {{1351--1358}},
  publisher    = {{Elsevier}},
  series       = {{Procedia Structural Integrity}},
  title        = {{Defect sensitivity of single-crystal nano-sized Cu beams}},
  url          = {{http://dx.doi.org/10.1016/j.prostr.2016.06.172}},
  doi          = {{10.1016/j.prostr.2016.06.172}},
  volume       = {{2}},
  year         = {{2016}},
}