Shielding effects and residual stresses at cleavage due to pre-existing dislocations
(1997) In International Journal of Fracture 85(4). p.365-380- Abstract
The motion of pre-existing edge dislocations in an infinite linear elastic body is studied at initiation of crack growth and at quasi-static steady-state crack growth. Dislocation nucleation is assumed not to occur. Thus, the study concerns only dislocations that are present in the virgin material. A dislocation is assumed to glide if its driving force exceeds a critical value. Changes in dislocation density, crack tip shielding and residual stresses are obtained. The shielding of a stationary crack tip is found to be small compared with the shielding of a growing crack tip. At steady-state the residual stresses far behind the crack tip are tensile near the crack, decreasing to zero at a certain distance from the crack plane. It is... (More)
The motion of pre-existing edge dislocations in an infinite linear elastic body is studied at initiation of crack growth and at quasi-static steady-state crack growth. Dislocation nucleation is assumed not to occur. Thus, the study concerns only dislocations that are present in the virgin material. A dislocation is assumed to glide if its driving force exceeds a critical value. Changes in dislocation density, crack tip shielding and residual stresses are obtained. The shielding of a stationary crack tip is found to be small compared with the shielding of a growing crack tip. At steady-state the residual stresses far behind the crack tip are tensile near the crack, decreasing to zero at a certain distance from the crack plane. It is shown that the shielding due to pre-existing dislocations, e.g., for cleavage in α-iron crystals may be considerable.
(Less)
- author
- Andersson, Peder and Ståhle, P. LU
- publishing date
- 1997
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Crack tip shielding, Dislocations, Monte Carlo simulation
- in
- International Journal of Fracture
- volume
- 85
- issue
- 4
- pages
- 16 pages
- publisher
- Springer
- external identifiers
-
- wos:000071245100005
- scopus:2342615624
- ISSN
- 0376-9429
- DOI
- 10.1023/a:1007473316872
- language
- English
- LU publication?
- no
- additional info
- Andersson, P Stahle, P Stahle, Per/J-3590-2014
- id
- 6e707c45-e4d2-49f1-a929-3985f32eedb3
- date added to LUP
- 2019-06-26 00:36:29
- date last changed
- 2022-01-31 22:39:44
@article{6e707c45-e4d2-49f1-a929-3985f32eedb3,
abstract = {{<p>The motion of pre-existing edge dislocations in an infinite linear elastic body is studied at initiation of crack growth and at quasi-static steady-state crack growth. Dislocation nucleation is assumed not to occur. Thus, the study concerns only dislocations that are present in the virgin material. A dislocation is assumed to glide if its driving force exceeds a critical value. Changes in dislocation density, crack tip shielding and residual stresses are obtained. The shielding of a stationary crack tip is found to be small compared with the shielding of a growing crack tip. At steady-state the residual stresses far behind the crack tip are tensile near the crack, decreasing to zero at a certain distance from the crack plane. It is shown that the shielding due to pre-existing dislocations, e.g., for cleavage in α-iron crystals may be considerable.</p>}},
author = {{Andersson, Peder and Ståhle, P.}},
issn = {{0376-9429}},
keywords = {{Crack tip shielding; Dislocations; Monte Carlo simulation}},
language = {{eng}},
number = {{4}},
pages = {{365--380}},
publisher = {{Springer}},
series = {{International Journal of Fracture}},
title = {{Shielding effects and residual stresses at cleavage due to pre-existing dislocations}},
url = {{http://dx.doi.org/10.1023/a:1007473316872}},
doi = {{10.1023/a:1007473316872}},
volume = {{85}},
year = {{1997}},
}