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Une méthode de correction élastoplastique pour le calcul en fatigue des zones de concentration de contraintes sous chargement cyclique multiaxial non proportionnel

Abstract : The first step of a low cycle fatigue life calculation consists in determining the stress and strain histories at critical points. To avoid time-consuming complete nite element computations, local elasto-plastic corrections may be used to evaluate those histories in a very short time. Existing approaches are not accurate enough, thus a new method inspired from homogenisation models is proposed. It was implemented in the ZeBuLoN FE code, and validated through multiaxial non proportional random loadings, which is not the case for any existing method. The obtained histories are used as an input for fatigue life calculation methods. A new cycle counting algorithm was also implemented to extract cycles from a multiaxial random loading sequence. It is a rainow technique, which takes into account all components of the loading, and denes a \cycle" in the deviatoric stresses space. Fatigue life calculations have been performed to evaluate the relevance of this calculation chain. Finally, we apply the method to an industrial component (crane frame arm).
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Submitted on : Monday, May 3, 2010 - 11:24:09 AM
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  • HAL Id : tel-00479991, version 1

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Thibault Herbland. Une méthode de correction élastoplastique pour le calcul en fatigue des zones de concentration de contraintes sous chargement cyclique multiaxial non proportionnel. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2009. Français. ⟨tel-00479991⟩

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