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Article Dans Une Revue International Journal of Fatigue Année : 2020

An energy-based strategy for fatigue analysis in presence of general multi-axial time varying loadings

Résumé

The purpose of this paper is to propose an energy based multi-scale fatigue approach which handles multidimensional time varying loading histories. Our fundamental thought is to assume that the energy dissipated at small scales governs fatigue at failure in a nonlinear additive way. We follow the Dang Van paradigm at macro scale. The structure is elastic at the macroscopic scale. At each material point, there is a stochastic distribution of weak points which will undergo strong plastic yielding, which contribute to energy dissipation without affecting the overall macroscopic stress. A kinematic hardening under the assumption of associative plasticity is also considered. Instead of using the number of cycles, we use the concept of multi-scale damage accumulation during the considered load history. A concise non-linear damage accumulation law is also proposed in our model. Fatigue will then be determined from the plastic shakedown cycle and from a phenomenological fatigue law linking lifetime and accumulated mesoscopic plastic dissipation.
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Dates et versions

hal-02421856 , version 1 (20-12-2019)

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Zepeng Ma, Habibou Maitournam, Patrick Le Tallec. An energy-based strategy for fatigue analysis in presence of general multi-axial time varying loadings. International Journal of Fatigue, 2020, 132, pp.105367. ⟨10.1016/j.ijfatigue.2019.105367⟩. ⟨hal-02421856⟩
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