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 |
Keywords
- Discrete dislocation dynamics
- Plasticity
- Size effects
- Surface effects
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
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Cite this
Han, C. S., Hartmaier, A., Gao, H., & Huang, Y. (2006). Discrete dislocation dynamics simulations of surface induced size effects in plasticity. Materials Science and Engineering A, 415(1-2), 225-233. https://doi.org/10.1016/j.msea.2005.09.075