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Size affected dislocation activity in crystals : advanced surface and grain boundary conditions
Citation Link: https://doi.org/10.15480/882.1695
Publikationstyp
Journal Article
Date Issued
2017-01-23
Sprache
English
Author(s)
TORE-DOI
Journal
Volume
13
Start Page
36
End Page
41
Citation
Extreme Mechanics Letters (13): 36-41 (2017)
Publisher DOI
Scopus ID
Publisher
Elsevier
Extended crystal plasticity theories are well established to study size-dependent hardening of metals. Surface and inner grain boundary conditions play a significant role for crystals at small scales as they
affect the dislocation activity and, hence, alter strength and strain hardening behavior. Conventional micro boundary conditions, i.e., microhard and microfree, are unable to capture the underlying physics as they describe ideal and over-simplified surface/interface conditions. In this work, advanced boundary conditions for gradient extended crystal plasticity are introduced to map realistic conditions at external surfaces, interphases, or grain boundaries. They relate the magnitude of plastic slip to surface defect density and slip directions with respect to the surface normal. Characteristic features are highlighted, including the effect of surface yielding and size dependent surface strengthening.
affect the dislocation activity and, hence, alter strength and strain hardening behavior. Conventional micro boundary conditions, i.e., microhard and microfree, are unable to capture the underlying physics as they describe ideal and over-simplified surface/interface conditions. In this work, advanced boundary conditions for gradient extended crystal plasticity are introduced to map realistic conditions at external surfaces, interphases, or grain boundaries. They relate the magnitude of plastic slip to surface defect density and slip directions with respect to the surface normal. Characteristic features are highlighted, including the effect of surface yielding and size dependent surface strengthening.
Subjects
higher-order boundary conditions
gradient extended crystal plasticity
defect density
size effect
surface yielding
nanoporous gold
DDC Class
500: Naturwissenschaften
530: Physik
620: Ingenieurwissenschaften
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