Abstract
Experiments have shown that the presence of free surfaces may induce harder as well as softer deformation behaviors in a crystalline solid. In order to shed some light on these apparently contradictory findings, two-dimensional discrete dislocation dynamics simulations are performed to investigate the surface induced size effects. The simulations indicate that, depending on the surface density of dislocation sources, a free surface may act either as a dislocation sink or as a net dislocation source, and can accordingly exert opposite effects on dislocation density over a boundary layer thickness of up to 500nm into the bulk. This finding provides a possible explanation for the apparent contradictions in experimental observations.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 225-233 |
| Number of pages | 9 |
| Journal | Materials Science and Engineering A |
| Volume | 415 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - Jan 15 2006 |
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Keywords
- Discrete dislocation dynamics
- Plasticity
- Size effects
- Surface effects
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
Cite this
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Discrete dislocation dynamics simulations of surface induced size effects in plasticity. / Han, Chung Souk; Hartmaier, Alexander; Gao, Huajian; Huang, Yonggang.
In: Materials Science and Engineering A, Vol. 415, No. 1-2, 15.01.2006, p. 225-233.Research output: Contribution to journal › Article
TY - JOUR
T1 - Discrete dislocation dynamics simulations of surface induced size effects in plasticity
AU - Han, Chung Souk
AU - Hartmaier, Alexander
AU - Gao, Huajian
AU - Huang, Yonggang
PY - 2006/1/15
Y1 - 2006/1/15
N2 - Experiments have shown that the presence of free surfaces may induce harder as well as softer deformation behaviors in a crystalline solid. In order to shed some light on these apparently contradictory findings, two-dimensional discrete dislocation dynamics simulations are performed to investigate the surface induced size effects. The simulations indicate that, depending on the surface density of dislocation sources, a free surface may act either as a dislocation sink or as a net dislocation source, and can accordingly exert opposite effects on dislocation density over a boundary layer thickness of up to 500nm into the bulk. This finding provides a possible explanation for the apparent contradictions in experimental observations.
AB - Experiments have shown that the presence of free surfaces may induce harder as well as softer deformation behaviors in a crystalline solid. In order to shed some light on these apparently contradictory findings, two-dimensional discrete dislocation dynamics simulations are performed to investigate the surface induced size effects. The simulations indicate that, depending on the surface density of dislocation sources, a free surface may act either as a dislocation sink or as a net dislocation source, and can accordingly exert opposite effects on dislocation density over a boundary layer thickness of up to 500nm into the bulk. This finding provides a possible explanation for the apparent contradictions in experimental observations.
KW - Discrete dislocation dynamics
KW - Plasticity
KW - Size effects
KW - Surface effects
UR - http://www.scopus.com/inward/record.url?scp=29244474595&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=29244474595&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2005.09.075
DO - 10.1016/j.msea.2005.09.075
M3 - Article
VL - 415
SP - 225
EP - 233
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
IS - 1-2
ER -