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Fatigue polycyclique multiaxiale de l'acier C35 : caractérisation et modélisation des mécanismes d'endommagement

Abstract : This study is dedicated to establish a model of life prediction for a polycrystalline metal subjected to multiaxial complex loading in high cycle fatigue. In order to understand the mechanisms of plasticity and damage to be modelled, a campaign of experiments conducted on a steel type C35 is carried out in the first part of the study. The modelling options are chosen according to this precise observation of mechanisms. The modelling focuses on the prediction of both infinite life regime and finite life regime (105 – 107 cycles). To address the first objective, a multiaxial fatigue criterion based on stress invariants is proposed. In spite of a simple formulation, the predictions of the criterion are in very good agreement with a wide range of experimental data conducted on various steels. In regard to the second objective, in order to overcome a purely phenomenological description, a two-scale damage model (macro – meso) integrates the proposed criterion and is formulated in the framework of thermodynamics of irreversible processes allowing to capture as closely as possible degradation mechanisms at mesoscopic scale as well as phase shift effect and non linear fatigue damage accumulation. The incremental formulation of the proposed model is an asset to deal with variable amplitude loadings in future works.
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Contributor : Bénédicte Carouge <>
Submitted on : Friday, January 8, 2010 - 2:38:17 PM
Last modification on : Friday, February 22, 2019 - 10:08:41 AM
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  • HAL Id : tel-00445429, version 1



Quoc Huy Vu. Fatigue polycyclique multiaxiale de l'acier C35 : caractérisation et modélisation des mécanismes d'endommagement. Sciences de l'ingénieur [physics]. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2009. Français. ⟨tel-00445429⟩



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