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Location, location &size: defects close to surfaces dominate fatigue crack initiation

Scientific reports, 2017-03, Vol.7 (1), p.45239-45239, Article 45239 [Peer Reviewed Journal]

Copyright Nature Publishing Group Mar 2017 ;Distributed under a Creative Commons Attribution 4.0 International License ;Copyright © 2017, The Author(s) 2017 The Author(s) ;ISSN: 2045-2322 ;EISSN: 2045-2322 ;DOI: 10.1038/srep45239 ;PMID: 28345599

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  • Title:
    Location, location &size: defects close to surfaces dominate fatigue crack initiation
  • Author: Serrano-Munoz, Itziar ; Buffiere, Jean-Yves ; Mokso, Rajmund ; Verdu, Catherine ; Nadot, Yves
  • Subjects: Condensed Matter ; Crack initiation ; Defects ; Materials Science ; Nucleation ; Physics ; X-rays
  • Is Part Of: Scientific reports, 2017-03, Vol.7 (1), p.45239-45239, Article 45239
  • Description: 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.
  • Publisher: England: Nature Publishing Group
  • Language: English
  • Identifier: ISSN: 2045-2322
    EISSN: 2045-2322
    DOI: 10.1038/srep45239
    PMID: 28345599
  • Source: PubMed Central (Open access)
    DOAJ Directory of Open Access Journals
    ProQuest Central
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