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.
Document type :
Theses
Complete list of metadatas

Cited literature [45 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-02180995
Contributor : Abes Star <>
Submitted on : Thursday, July 11, 2019 - 5:48:06 PM
Last modification on : Friday, July 12, 2019 - 1:25:06 PM

File

2018SORUS068.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-02180995, version 1

Citation

Asma Manai. Sur une approche pragmatique de l'endommagement anisotrope par fatigue basée sur un critère de fatigue et ses gradients. Mécanique [physics]. Sorbonne Université; École nationale d'ingénieurs de Tunis (Tunisie), 2018. Français. ⟨NNT : 2018SORUS068⟩. ⟨tel-02180995⟩

Share

Metrics

Record views

146

Files downloads

10