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Characteristics of short fatigue crack growth in the vicinity of a low angle grain boundary

Hansson, Per LU and Melin, Solveig LU (2012) 7th EUROMECH Solid Mechanics Conference (ESMC7) In International Journal of Fatigue 36(1). p.59-67
Abstract
The influence on the crack growth behaviour of a short edge crack under fatigue due to different configurations of a nearby located low angle grain boundary is investigated under quasi-static and plane strain conditions. The geometry is modelled by distributed dislocation dipole elements in a boundary element method approach, and the plasticity is described by discrete dislocations, located along specific slip planes in the material. The crack is assumed to grow in a single shear mechanism due to nucleation, glide and annihilation of dislocations in the material. It was found that both the nature of the dislocations in the grain boundary, the distances between them and the placement of the dislocations in the grain boundary with respect to... (More)
The influence on the crack growth behaviour of a short edge crack under fatigue due to different configurations of a nearby located low angle grain boundary is investigated under quasi-static and plane strain conditions. The geometry is modelled by distributed dislocation dipole elements in a boundary element method approach, and the plasticity is described by discrete dislocations, located along specific slip planes in the material. The crack is assumed to grow in a single shear mechanism due to nucleation, glide and annihilation of dislocations in the material. It was found that both the nature of the dislocations in the grain boundary, the distances between them and the placement of the dislocations in the grain boundary with respect to preferred slip plane directions strongly influenced the growth behaviour. It was found that, a boundary consisting of dislocations with Burgers vector pointing inwards into the material attracted the dislocations in the plastic zone. This resulted in lower growth rates as compared with a boundary consisting of dislocations having a Burgers vector pointing outwards of the material. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Short crack, discrete dislocation, fatigue, low angle grain boundary.
in
International Journal of Fatigue
volume
36
issue
1
pages
59 - 67
publisher
Elsevier
conference name
7th EUROMECH Solid Mechanics Conference (ESMC7)
external identifiers
  • scopus:80955158421
  • wos:000297612000008
ISSN
1879-3452
DOI
10.1016/j.ijfatigue.2011.08.015
language
English
LU publication?
yes
id
ce349e66-8d8b-451f-85c9-478608cbd5ee (old id 2539436)
date added to LUP
2012-05-10 15:20:51
date last changed
2017-01-01 03:08:46
@article{ce349e66-8d8b-451f-85c9-478608cbd5ee,
  abstract     = {The influence on the crack growth behaviour of a short edge crack under fatigue due to different configurations of a nearby located low angle grain boundary is investigated under quasi-static and plane strain conditions. The geometry is modelled by distributed dislocation dipole elements in a boundary element method approach, and the plasticity is described by discrete dislocations, located along specific slip planes in the material. The crack is assumed to grow in a single shear mechanism due to nucleation, glide and annihilation of dislocations in the material. It was found that both the nature of the dislocations in the grain boundary, the distances between them and the placement of the dislocations in the grain boundary with respect to preferred slip plane directions strongly influenced the growth behaviour. It was found that, a boundary consisting of dislocations with Burgers vector pointing inwards into the material attracted the dislocations in the plastic zone. This resulted in lower growth rates as compared with a boundary consisting of dislocations having a Burgers vector pointing outwards of the material.},
  author       = {Hansson, Per and Melin, Solveig},
  issn         = {1879-3452},
  keyword      = {Short crack,discrete dislocation,fatigue,low angle grain boundary.},
  language     = {eng},
  number       = {1},
  pages        = {59--67},
  publisher    = {Elsevier},
  series       = {International Journal of Fatigue},
  title        = {Characteristics of short fatigue crack growth in the vicinity of a low angle grain boundary},
  url          = {http://dx.doi.org/10.1016/j.ijfatigue.2011.08.015},
  volume       = {36},
  year         = {2012},
}