Overload effects on fatigue crack-tip fields under plane stress conditions: surface and bulk analysis
(2013) In Fatigue & Fracture of Engineering Materials & Structures 36(1). p.75-84- Abstract
- The surface crack opening displacements are characterised by digital image correlation for a (thin) plane stress 316 stainless steel compact tension sample subjected to an overload event. This supports a traditional plasticity-induced closure interpretation showing a knee in the closure response prior to overload, an absence of closure in the accelerated growth regime followed by accentuated closure in the retardation regime. By contrast, measurement of the mid-thickness elastic strain field behind and ahead of the crack made by synchrotron X-ray diffraction shows no evidence of significant crack face contact stresses behind the crack tip on approaching minimum loading. Rather the changes during loading and overloading can mostly be... (More)
- The surface crack opening displacements are characterised by digital image correlation for a (thin) plane stress 316 stainless steel compact tension sample subjected to an overload event. This supports a traditional plasticity-induced closure interpretation showing a knee in the closure response prior to overload, an absence of closure in the accelerated growth regime followed by accentuated closure in the retardation regime. By contrast, measurement of the mid-thickness elastic strain field behind and ahead of the crack made by synchrotron X-ray diffraction shows no evidence of significant crack face contact stresses behind the crack tip on approaching minimum loading. Rather the changes during loading and overloading can mostly be explained by a simple elastic plastic analysis using a value of the yield stress intermediate between the initial yield stress and the UTS. This shows very significant compressive reverse plastic strains ahead of the crack that start to form early during unloading. At the moment it is not clear whether this difference is because of the increasing stress intensity applied as the crack grows, or for some other reason, such as prevention of the crack faces closing mid-thickness due to the reverse plastic zone. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3400870
- author
- Lopez-Crespo, P. ; Withers, P. J. ; Yusof, F. ; Dai, H. ; Steuwer, Axel LU ; Kelleher, J. F. and Buslaps, T.
- organization
- publishing date
- 2013
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- overload effect, synchrotron X-ray diffraction
- in
- Fatigue & Fracture of Engineering Materials & Structures
- volume
- 36
- issue
- 1
- pages
- 75 - 84
- publisher
- Wiley-Blackwell
- external identifiers
-
- wos:000312455600008
- scopus:84871025746
- ISSN
- 1460-2695
- DOI
- 10.1111/j.1460-2695.2012.01670.x
- language
- English
- LU publication?
- yes
- id
- bae9b36d-d335-4b30-9564-c5d726025d78 (old id 3400870)
- date added to LUP
- 2016-04-01 11:09:54
- date last changed
- 2022-04-20 17:28:16
@article{bae9b36d-d335-4b30-9564-c5d726025d78,
abstract = {{The surface crack opening displacements are characterised by digital image correlation for a (thin) plane stress 316 stainless steel compact tension sample subjected to an overload event. This supports a traditional plasticity-induced closure interpretation showing a knee in the closure response prior to overload, an absence of closure in the accelerated growth regime followed by accentuated closure in the retardation regime. By contrast, measurement of the mid-thickness elastic strain field behind and ahead of the crack made by synchrotron X-ray diffraction shows no evidence of significant crack face contact stresses behind the crack tip on approaching minimum loading. Rather the changes during loading and overloading can mostly be explained by a simple elastic plastic analysis using a value of the yield stress intermediate between the initial yield stress and the UTS. This shows very significant compressive reverse plastic strains ahead of the crack that start to form early during unloading. At the moment it is not clear whether this difference is because of the increasing stress intensity applied as the crack grows, or for some other reason, such as prevention of the crack faces closing mid-thickness due to the reverse plastic zone.}},
author = {{Lopez-Crespo, P. and Withers, P. J. and Yusof, F. and Dai, H. and Steuwer, Axel and Kelleher, J. F. and Buslaps, T.}},
issn = {{1460-2695}},
keywords = {{overload effect; synchrotron X-ray diffraction}},
language = {{eng}},
number = {{1}},
pages = {{75--84}},
publisher = {{Wiley-Blackwell}},
series = {{Fatigue & Fracture of Engineering Materials & Structures}},
title = {{Overload effects on fatigue crack-tip fields under plane stress conditions: surface and bulk analysis}},
url = {{http://dx.doi.org/10.1111/j.1460-2695.2012.01670.x}},
doi = {{10.1111/j.1460-2695.2012.01670.x}},
volume = {{36}},
year = {{2013}},
}