Location, location &size : Defects close to surfaces dominate fatigue crack initiation
(2017) In Scientific Reports 7.- Abstract
Metallic cast components inevitably contain defects such as shrinkage cavities which are inherent to the solidification process. Those defects are known to significantly alter the fatigue life of components. Yet very little is known, quantitatively, on the dangerosity of internal casting defects compared to surface ones. In this study, fatigue specimens containing controlled internal defects (shrinkage pores) are used to foster internal cracking. In situ fatigue tests monitored by X ray synchrotron tomography revealed that the internal nucleation and propagation of cracks was systematically overran by surface cracking initiated at castings defects up to ten times smaller than the internal ones. These findings indicate that the presence... (More)
Metallic cast components inevitably contain defects such as shrinkage cavities which are inherent to the solidification process. Those defects are known to significantly alter the fatigue life of components. Yet very little is known, quantitatively, on the dangerosity of internal casting defects compared to surface ones. In this study, fatigue specimens containing controlled internal defects (shrinkage pores) are used to foster internal cracking. In situ fatigue tests monitored by X ray synchrotron tomography revealed that the internal nucleation and propagation of cracks was systematically overran by surface cracking initiated at castings defects up to ten times smaller than the internal ones. These findings indicate that the presence of internal defects in cast components can be tolerated to a larger extent than is allowed by nowadays standards.
(Less)
- author
- Serrano-Munoz, Itziar ; Buffiere, Jean Yves ; Mokso, Rajmund LU ; Verdu, Catherine and Nadot, Yves
- publishing date
- 2017-03-27
- type
- Contribution to journal
- publication status
- published
- in
- Scientific Reports
- volume
- 7
- article number
- 45239
- publisher
- Nature Publishing Group
- external identifiers
-
- pmid:28345599
- scopus:85016314399
- ISSN
- 2045-2322
- DOI
- 10.1038/srep45239
- language
- English
- LU publication?
- no
- id
- 67bb8b1c-c8bb-4aec-9802-286a5d897bed
- date added to LUP
- 2017-09-19 14:34:55
- date last changed
- 2024-04-14 17:57:06
@article{67bb8b1c-c8bb-4aec-9802-286a5d897bed,
abstract = {{<p>Metallic cast components inevitably contain defects such as shrinkage cavities which are inherent to the solidification process. Those defects are known to significantly alter the fatigue life of components. Yet very little is known, quantitatively, on the dangerosity of internal casting defects compared to surface ones. In this study, fatigue specimens containing controlled internal defects (shrinkage pores) are used to foster internal cracking. In situ fatigue tests monitored by X ray synchrotron tomography revealed that the internal nucleation and propagation of cracks was systematically overran by surface cracking initiated at castings defects up to ten times smaller than the internal ones. These findings indicate that the presence of internal defects in cast components can be tolerated to a larger extent than is allowed by nowadays standards.</p>}},
author = {{Serrano-Munoz, Itziar and Buffiere, Jean Yves and Mokso, Rajmund and Verdu, Catherine and Nadot, Yves}},
issn = {{2045-2322}},
language = {{eng}},
month = {{03}},
publisher = {{Nature Publishing Group}},
series = {{Scientific Reports}},
title = {{Location, location &size : Defects close to surfaces dominate fatigue crack initiation}},
url = {{http://dx.doi.org/10.1038/srep45239}},
doi = {{10.1038/srep45239}},
volume = {{7}},
year = {{2017}},
}