Plasticity localization ahead of a crack tip modeled by 2D discrete dislocation dynamics

The formation of a plastic zone in the presence of a crack, in a bicrystal, is modeled by two-dimensional discrete dislocation dynamics. The influence of a large number of parameters is studied: the misorientation, the emission from the crack tip and the obstacle density which modifies the internal...

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Bibliographic Details
Published in:Philosophical magazine (Abingdon, England) England), 2010-04, Vol.90 (11), p.1415-1434
Main Authors: Tanguy, D., Delafosse, D., Razafindrazaka, M.
Format: Article
Language:English
Subjects:
computational mechanics
Cracks
Cross-disciplinary physics: materials science
rheology
Deformation, plasticity, and creep
dislocation dynamics
Dislocations
Dynamics
Engineering Sciences
Exact sciences and technology
fracture
Localization
Materials
Materials science
numerical modeling
Physics
Plasticity
plasticity of metals
Position (location)
Treatment of materials and its effects on microstructure and properties
Two dimensional
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Summary:The formation of a plastic zone in the presence of a crack, in a bicrystal, is modeled by two-dimensional discrete dislocation dynamics. The influence of a large number of parameters is studied: the misorientation, the emission from the crack tip and the obstacle density which modifies the internal stress (hardening) and degree of localization of mobile dislocations (slip bands). Emphasis is put on obtaining the best ductility, since the focus is on face centered cubic materials. Finally, a strong effect of the plastic model on the dynamics and on the secondary slip (intensity and localization), beyond the influence of the initial distribution of sources and obstacles, is reported.
ISSN:1478-6435
1478-6443
1478-6433
DOI:10.1080/14786430903386159