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Hybrid discrete dislocation models for fatigue crack growth

Curtin, W. A.; Deshpande, V. S.; Needleman, A.; Van der Giessen, E. and Wallin, Mathias LU (2010) In International Journal of Fatigue 32(9). p.1511-1520
Abstract
A framework for accurately modeling fatigue crack growth in ductile crystalline solids is necessarily multiscale The creation of new free surface occurs at the atomistic scale, where the material's cohesive strength is controlled by the local chemistry On the other hand, significant dissipation during fatigue crack growth takes place at a size scale that can be modeled appropriately by conventional continuum mechanics. The intermediate size scale where the discreteness of dislocations comes Into play is the main origin of the hysteresis needed for fatigue and of the high stresses required for atomistic separation to take place. We focus on recent developments which permit analyses of fatigue crack growth involving the direct coupling of... (More)
A framework for accurately modeling fatigue crack growth in ductile crystalline solids is necessarily multiscale The creation of new free surface occurs at the atomistic scale, where the material's cohesive strength is controlled by the local chemistry On the other hand, significant dissipation during fatigue crack growth takes place at a size scale that can be modeled appropriately by conventional continuum mechanics. The intermediate size scale where the discreteness of dislocations comes Into play is the main origin of the hysteresis needed for fatigue and of the high stresses required for atomistic separation to take place. We focus on recent developments which permit analyses of fatigue crack growth involving the direct coupling of disparate size scales. Although no analyses have been carried out directly coupling size scales from the atomic to the conventional continuum, the ingredients to do so are in place. We provide background that illustrates the key role played by the intermediate discrete dislocation size scale and review steps that have been taken to permit direct size scale coupling. The prospects and modeling needs for further developments are also discussed (C) 2009 Elsevier Ltd All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Crack growth, Fatigue, Discrete dislocation plasticity, modeling, Multiscale
in
International Journal of Fatigue
volume
32
issue
9
pages
1511 - 1520
publisher
Elsevier
external identifiers
  • wos:000278637300009
  • scopus:77955201407
ISSN
1879-3452
DOI
10.1016/j.ijfatigue.2009.10.015
language
English
LU publication?
yes
id
de086b77-7f42-485c-a8b6-8ff90b35558c (old id 1631015)
date added to LUP
2010-07-21 13:27:43
date last changed
2018-05-29 10:18:02
@article{de086b77-7f42-485c-a8b6-8ff90b35558c,
  abstract     = {A framework for accurately modeling fatigue crack growth in ductile crystalline solids is necessarily multiscale The creation of new free surface occurs at the atomistic scale, where the material's cohesive strength is controlled by the local chemistry On the other hand, significant dissipation during fatigue crack growth takes place at a size scale that can be modeled appropriately by conventional continuum mechanics. The intermediate size scale where the discreteness of dislocations comes Into play is the main origin of the hysteresis needed for fatigue and of the high stresses required for atomistic separation to take place. We focus on recent developments which permit analyses of fatigue crack growth involving the direct coupling of disparate size scales. Although no analyses have been carried out directly coupling size scales from the atomic to the conventional continuum, the ingredients to do so are in place. We provide background that illustrates the key role played by the intermediate discrete dislocation size scale and review steps that have been taken to permit direct size scale coupling. The prospects and modeling needs for further developments are also discussed (C) 2009 Elsevier Ltd All rights reserved.},
  author       = {Curtin, W. A. and Deshpande, V. S. and Needleman, A. and Van der Giessen, E. and Wallin, Mathias},
  issn         = {1879-3452},
  keyword      = {Crack growth,Fatigue,Discrete dislocation plasticity,modeling,Multiscale},
  language     = {eng},
  number       = {9},
  pages        = {1511--1520},
  publisher    = {Elsevier},
  series       = {International Journal of Fatigue},
  title        = {Hybrid discrete dislocation models for fatigue crack growth},
  url          = {http://dx.doi.org/10.1016/j.ijfatigue.2009.10.015},
  volume       = {32},
  year         = {2010},
}