期刊
MECHANICS OF MATERIALS
卷 145, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mechmat.2020.103393
关键词
Strain gradient crystal plasticity; Dislocations; Finite elements; Boundary conditions; Surface effects
资金
- Fonds de la Recherche Scientifique de Belgique (F.R.S-FNRS) [2.5020.11]
The behavior of dislocations in the neighborhood of a metallurgical interface or a free surface can be totally different depending on the boundary conditions. Dislocations cease to move and accumulate around impermeable interfaces, such as grain boundaries or hard (i.e. coated or oxidized) external surfaces. On the contrary, dislocations annihilate on free surfaces, as supported by the image force concept. However the behavior of dislocations depends on the true surface permeability, which falls between these two idealized cases. In this paper, two different numerical methods are applied to model the intermediate surface behaviors: the virtual image geometrically necessary dislocation approach and the generalized elastic foundation approach while a strain gradient crystal plasticity constitutive law simulates the response of a Ni single crystal. It is demonstrated that a uniform dislocation density field on the surface can only be obtained by a variant of the generalized elastic foundation approach.
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