Stress Gradient Plasticity: Concept and Applications

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.


Editor(s):
Bai, Yilong
Wang, Jianxiang
Fan, Daining
Published in:
Procedia IUTAM, 10, 453-461
Presented at:
23rd International Congress of Theoretical and Applied Mechanics, Beijing, China, Aug 19-24, 2012
Year:
2014
Publisher:
Elsevier
ISSN:
2210-9838
Laboratories:




 Record created 2014-11-19, last modified 2018-09-13


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