Fatigue crack growth in the vicinity of a grain boundary modelled using a discrete dislocation technique
(2008) 17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, ECF17 In 17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures 1. p.288-293- Abstract
It is well known that the behaviour of short cracks differs from that of long cracks due to the relatively large plastic zone and strong influence from the surrounding microstructure, and for very low growth rates, it is important to account for discrete dislocations within the material. In this study, a discrete dislocation model is presented for the study of the growth behaviour of a short edge crack, located near a low angle grain boundary. The initial crack is situated within one grain and the developing plasticity in front of the crack is restricted to this grain and the next, adjoining grain. The fatigue crack is assumed to propagate in a single shear mechanism. The model is a combination of a discrete dislocation formulation and... (More)
It is well known that the behaviour of short cracks differs from that of long cracks due to the relatively large plastic zone and strong influence from the surrounding microstructure, and for very low growth rates, it is important to account for discrete dislocations within the material. In this study, a discrete dislocation model is presented for the study of the growth behaviour of a short edge crack, located near a low angle grain boundary. The initial crack is situated within one grain and the developing plasticity in front of the crack is restricted to this grain and the next, adjoining grain. The fatigue crack is assumed to propagate in a single shear mechanism. The model is a combination of a discrete dislocation formulation and a boundary element approach, where the geometry is modelled by dislocation dipole elements and the plasticity by discrete dislocations. The influence from grain boundary character on the development of the plastic zone and, thereby, on the crack growth behaviour is investigated.
(Less)
- author
- Hansson, Per LU and Melin, Solveig LU
- organization
- publishing date
- 2008
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- Discrete dislocation, Fatigue, Grain boundary
- host publication
- 17th European Conference on Fracture 2008 : Multilevel Approach to Fracture of Materials, Components and Structures - Multilevel Approach to Fracture of Materials, Components and Structures
- series title
- 17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures
- volume
- 1
- pages
- 6 pages
- conference name
- 17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, ECF17
- conference location
- Brno, Czech Republic
- conference dates
- 2008-09-02 - 2008-09-05
- external identifiers
-
- scopus:84866076220
- ISBN
- 9781617823190
- language
- English
- LU publication?
- yes
- id
- 6ab4d8d8-2ef9-4358-9676-887bdddc7d89
- date added to LUP
- 2025-01-07 14:38:32
- date last changed
- 2025-04-04 15:24:28
@inproceedings{6ab4d8d8-2ef9-4358-9676-887bdddc7d89,
abstract = {{<p>It is well known that the behaviour of short cracks differs from that of long cracks due to the relatively large plastic zone and strong influence from the surrounding microstructure, and for very low growth rates, it is important to account for discrete dislocations within the material. In this study, a discrete dislocation model is presented for the study of the growth behaviour of a short edge crack, located near a low angle grain boundary. The initial crack is situated within one grain and the developing plasticity in front of the crack is restricted to this grain and the next, adjoining grain. The fatigue crack is assumed to propagate in a single shear mechanism. The model is a combination of a discrete dislocation formulation and a boundary element approach, where the geometry is modelled by dislocation dipole elements and the plasticity by discrete dislocations. The influence from grain boundary character on the development of the plastic zone and, thereby, on the crack growth behaviour is investigated.</p>}},
author = {{Hansson, Per and Melin, Solveig}},
booktitle = {{17th European Conference on Fracture 2008 : Multilevel Approach to Fracture of Materials, Components and Structures}},
isbn = {{9781617823190}},
keywords = {{Discrete dislocation; Fatigue; Grain boundary}},
language = {{eng}},
pages = {{288--293}},
series = {{17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures}},
title = {{Fatigue crack growth in the vicinity of a grain boundary modelled using a discrete dislocation technique}},
volume = {{1}},
year = {{2008}},
}