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Crack growth rates for short fatigue cracks simulated using a discrete dislocation technique

Hansson, Per LU (2009) In International Journal of Fatigue 31(8-9). p.1346-1355
Abstract
The influence on the crack growth rate for a short edge crack under fatigue loading due to changes in crack length, grain size, load range and grain boundary configuration, 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. The crack is assumed to grow due to nucleation, glide and annihilation of dislocations along slip planes in the material in a single shear mechanism. The results of the investigation are compared to typical growth rates for long cracks and it is found that the increase in growth rate due to a prescribed stress intensity factor range was much less... (More)
The influence on the crack growth rate for a short edge crack under fatigue loading due to changes in crack length, grain size, load range and grain boundary configuration, 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. The crack is assumed to grow due to nucleation, glide and annihilation of dislocations along slip planes in the material in a single shear mechanism. The results of the investigation are compared to typical growth rates for long cracks and it is found that the increase in growth rate due to a prescribed stress intensity factor range was much less pronounced as compared to what holds for long cracks. (C) 2009 Elsevier Ltd. All rights reserved. (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
Growth rate, Grain boundary, Short crack, Discrete dislocations
in
International Journal of Fatigue
volume
31
issue
8-9
pages
1346 - 1355
publisher
Elsevier
external identifiers
  • wos:000267401900014
  • scopus:67349204084
ISSN
1879-3452
DOI
10.1016/j.ijfatigue.2009.03.001
language
English
LU publication?
yes
id
e1c65282-3e2b-419d-9c33-ca50c5406dc7 (old id 1463171)
date added to LUP
2009-08-18 14:20:02
date last changed
2017-01-01 04:54:18
@article{e1c65282-3e2b-419d-9c33-ca50c5406dc7,
  abstract     = {The influence on the crack growth rate for a short edge crack under fatigue loading due to changes in crack length, grain size, load range and grain boundary configuration, 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. The crack is assumed to grow due to nucleation, glide and annihilation of dislocations along slip planes in the material in a single shear mechanism. The results of the investigation are compared to typical growth rates for long cracks and it is found that the increase in growth rate due to a prescribed stress intensity factor range was much less pronounced as compared to what holds for long cracks. (C) 2009 Elsevier Ltd. All rights reserved.},
  author       = {Hansson, Per},
  issn         = {1879-3452},
  keyword      = {Growth rate,Grain boundary,Short crack,Discrete dislocations},
  language     = {eng},
  number       = {8-9},
  pages        = {1346--1355},
  publisher    = {Elsevier},
  series       = {International Journal of Fatigue},
  title        = {Crack growth rates for short fatigue cracks simulated using a discrete dislocation technique},
  url          = {http://dx.doi.org/10.1016/j.ijfatigue.2009.03.001},
  volume       = {31},
  year         = {2009},
}