RESEARCH ARTICLE


Propagation Lifetime from the Surface and Internal Defects in the Ultra High Cycle Fatigue Regime



Yves Nadot*
Laboratoire de Mécanique et de Physique des Matériaux, UMR CNRS 6617, ENSMA, 1 avenue Clément Ader, Téléport 2, BP 40 109, 86 961 Futuroscope cedex, France.


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© 2008 Yves Nadot;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Laboratoire de Mécanique et de Physique des Matériaux, UMR CNRS 6617, ENSMA, 1 avenue Clément Ader, Téléport 2, BP 40 109, 86 961 Futuroscope cedex, France; E-mail: yves.nadot@lmpm.ensma.fr


Abstract

Ultra High Cycle fatigue leads to a failure initiated in the bulk material of a material. Some results on the nodular cast iron are presented: initiation occurs from the defects, located at the surface or in the bulk. It has been shown that environment plays a major role that could explain the difference between fatigue lives, for the surface and internal initiation. The influence of the defect size and crack growth law is discussed and, the importance of fatigue crack initiation stage is revealed, in the ultra high cycle regime

Keywords: Casting, high cycle fatigue, environmental effect, defect.