| Autor: |
William A. Curtin, Srinath S. Chakravarthy |
| Přispěvatelé: |
Bai, Yilong, Wang, Jianxiang, Fan, Daining |
| Rok vydání: |
2014 |
| Předmět: |
|
| Zdroj: |
Procedia IUTAM. 10:453-461 |
| ISSN: |
2210-9838 |
| DOI: |
10.1016/j.piutam.2014.01.040 |
| Popis: |
The effect of a linear applied shear stress gradient on the yield stress of a dislocation pileup is investigated analyti- cally using the continuum theory of dislocation pileups. The solution agrees well with numerical discrete dislocation simulations of a single source-obstacle pair. A lower order continuum viscoplastic theory and the fiinite element imple- mentation of the basic concept of stress gradient plasticity is described and the numerical model is applied to examine plasticity size effects in beam bending and micro/nano-indentation. The numerical results capture several aspects of the deformation behavior that are commonly observed in these experiments, thus laying the foundations for a full continuum theory of stress gradient plasticity. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
