Computationally efficient modelling of short fatigue crack growth using dislocation formulations
Author
Summary, in English
Abstract in Undetermined
In an attempt to develop it computationally efficient model for simulation of fatigue crack growth of microstructurally short cracks two dislocation based models have been compared. In both models, the geometry of the boundary and the crack is described using dislocation dipole elements, whereas the plasticity is described either by discrete dislocations or by distributed dipole elements. The two models were found to agree qualitatively its well as quantitatively. It was concluded that modelling the plasticity by dipole elements becomes comparatively increasingly more time efficient with increasing grain size plastic zone size. However, plasticity modelling by dipole elements showed to provide somewhat higher crack growth rates.
In an attempt to develop it computationally efficient model for simulation of fatigue crack growth of microstructurally short cracks two dislocation based models have been compared. In both models, the geometry of the boundary and the crack is described using dislocation dipole elements, whereas the plasticity is described either by discrete dislocations or by distributed dipole elements. The two models were found to agree qualitatively its well as quantitatively. It was concluded that modelling the plasticity by dipole elements becomes comparatively increasingly more time efficient with increasing grain size plastic zone size. However, plasticity modelling by dipole elements showed to provide somewhat higher crack growth rates.
Department/s
Publishing year
2008
Language
English
Pages
3189-3205
Publication/Series
Engineering Fracture Mechanics
Volume
75
Issue
10
Links
Document type
Journal article
Publisher
Elsevier
Topic
- Materials Engineering
- Applied Mechanics
Keywords
- short crack
- discrete dislocation
- distributed dislocations
- single shear
- fatigue
Status
Published
ISBN/ISSN/Other
- ISSN: 1873-7315