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A tool to model short crack fatigue growth using a discrete dislocation formulation

Bjerkén, Christina LU and Melin, Solveig LU (2003) In International Journal of Fatigue 25(6). p.559-566
Abstract
A method is presented that combines the modelling of cracks by distributed dislocation dipoles with developing plasticity represented by discrete dislocations moving along slip bands. Crack growth is due to the emission of dislocations from the crack tip along preferred slip planes. Eventual annihilation of dislocations occurs by reunion with the corresponding displacement steps of the crack surface. Crack surface overlap is not allowed. The equilibrium state for each load increment is solved iteratively, allowing various crack geometries. The method is applied to the problem of a short edge crack growing in mode I due to fatigue loading. It is shown that the development of a local plastic zone and the propagation of the crack can be... (More)
A method is presented that combines the modelling of cracks by distributed dislocation dipoles with developing plasticity represented by discrete dislocations moving along slip bands. Crack growth is due to the emission of dislocations from the crack tip along preferred slip planes. Eventual annihilation of dislocations occurs by reunion with the corresponding displacement steps of the crack surface. Crack surface overlap is not allowed. The equilibrium state for each load increment is solved iteratively, allowing various crack geometries. The method is applied to the problem of a short edge crack growing in mode I due to fatigue loading. It is shown that the development of a local plastic zone and the propagation of the crack can be monitored in detail. (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 cracks, dislocation dipoles, discrete dislocations, fatigue
in
International Journal of Fatigue
volume
25
issue
6
pages
559 - 566
publisher
Elsevier
external identifiers
  • wos:000182643600010
  • scopus:0037409853
ISSN
1879-3452
DOI
10.1016/S0142-1123(02)00144-5
language
English
LU publication?
yes
id
5677e2c7-fac4-42e3-8198-ec3c8b815777 (old id 312066)
date added to LUP
2007-08-02 12:18:10
date last changed
2018-01-07 06:06:00
@article{5677e2c7-fac4-42e3-8198-ec3c8b815777,
  abstract     = {A method is presented that combines the modelling of cracks by distributed dislocation dipoles with developing plasticity represented by discrete dislocations moving along slip bands. Crack growth is due to the emission of dislocations from the crack tip along preferred slip planes. Eventual annihilation of dislocations occurs by reunion with the corresponding displacement steps of the crack surface. Crack surface overlap is not allowed. The equilibrium state for each load increment is solved iteratively, allowing various crack geometries. The method is applied to the problem of a short edge crack growing in mode I due to fatigue loading. It is shown that the development of a local plastic zone and the propagation of the crack can be monitored in detail.},
  author       = {Bjerkén, Christina and Melin, Solveig},
  issn         = {1879-3452},
  keyword      = {short cracks,dislocation dipoles,discrete dislocations,fatigue},
  language     = {eng},
  number       = {6},
  pages        = {559--566},
  publisher    = {Elsevier},
  series       = {International Journal of Fatigue},
  title        = {A tool to model short crack fatigue growth using a discrete dislocation formulation},
  url          = {http://dx.doi.org/10.1016/S0142-1123(02)00144-5},
  volume       = {25},
  year         = {2003},
}