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Comportement anisotrope en fatigue des composants mécaniques forgés

Abstract : This study is including on an ANR project concerning the fatigue behavior of forged components. On the one hand, it aims to understand the effects of microstructural heterogeneities resulting from the process operation on the damage mechanisms in fatigue. On the other and, it aims to propose an anisotropic fatigue criterion adapted to forged mechanical components. In a first part, the analysis of the effects of the plastic deformation process (forging and rolling) on the fatigue strength is studied. From various fatigue tests, the anistropic fatigue behaviour of various steel is characterized. The damage mechanism in fatigue, the effects of the microstructure and the inclusions contents are particularly analyzed. Self-heating tests are also carried out in order to test the use of this fast method on anisotropic fatigue steel. A probabilistic fatigue criterion is proposed. Based on the weakest link theory, it permits to express in a simple way the possible competition between various types of mechanism. The criterion obtained is adapted for materials containing or not defects and leads to a Kitagawa type diagram and explain the anisotropy in the material. Thanks to this new criterion, microstructural parameters from the forming operation can be integrated in the calculation in fatigue. An optimimization of the forged of the perform of the component or parameters process can consequently considered.
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https://tel.archives-ouvertes.fr/tel-00464089
Contributor : Etienne Pessard <>
Submitted on : Monday, March 15, 2010 - 8:19:28 PM
Last modification on : Friday, October 23, 2020 - 4:37:29 PM
Long-term archiving on: : Friday, June 18, 2010 - 8:02:59 PM

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  • HAL Id : tel-00464089, version 1

Citation

Etienne Pessard. Comportement anisotrope en fatigue des composants mécaniques forgés. Mécanique [physics.med-ph]. Université d'Angers, 2009. Français. ⟨tel-00464089⟩

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