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Sur une approche pragmatique de l’endommagement anisotrope par fatigue basée sur un critère de fatigue et ses gradients

Abstract : A new practical engineering methodology for the analysis of structures under cyclic loading is proposed in this work. A new anisotropic fatigue damage model is developed. The evolution of material properties degradation depends on a failure criterion and its gradient. The anisotropic material degradation will guide the damage propagation. The propagation of damage is mainly depending on the ridges of the criterion’s “surface” (zero gradients). The proposed approach can describe the initiation and propagation of the damage until the structural failure under fatigue loading. For each finite element, non-homogeneous anisotropic distributions of material properties are associated. Schematically, it seems like a material “surfing” on the criterion’s “surface” and damages follow the crest of the criterion’s “surface” (level and gradient). A global approach criterion, based on invariants of the stress tensor, is adopted. The reduction of material properties is assigned to a number of cycles and a global level of stresses, using an experimental Wöhler curve. Two simplified forms of the model are proposed and results are compared with a cruciform experimental reference example and an industrial case. A mapping with Dang Van criterion is also computed to analyze the numerical results
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https://hal.archives-ouvertes.fr/hal-02105240
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Submitted on : Sunday, June 23, 2019 - 10:43:27 AM
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  • HAL Id : hal-02105240, version 2

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Asma Manai. Sur une approche pragmatique de l’endommagement anisotrope par fatigue basée sur un critère de fatigue et ses gradients. Mécanique [physics.med-ph]. Sorbonne Universite, 2018. Français. ⟨NNT : 2018SORUS068⟩. ⟨hal-02105240v2⟩

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