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Publisher DOI: 10.1016/j.eml.2017.01.007
Title: Size affected dislocation activity in crystals : advanced surface and grain boundary conditions
Language: English
Authors: Husser, Edgar 
Soyarslan, Celal 
Bargmann, Swantje 
Keywords: higher-order boundary conditions;gradient extended crystal plasticity;defect density;size effect;surface yielding;nanoporous gold
Issue Date: 23-Jan-2017
Publisher: Elsevier
Source: Extreme Mechanics Letters (13): 36-41 (2017)
Journal or Series Name: Extreme mechanics letters 
Abstract (english): 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.
DOI: 10.15480/882.1695
ISSN: 2352-4316
Institute: Kontinuums- und Werkstoffmechanik M-15 
Type: (wissenschaftlicher) Artikel
License: CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives) CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)
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