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Effet de la méso-architecture sur le comportement en fatigue des structures lattices optimisées obtenues par fabrication additive

Abstract : A numerical approach is proposed to assess the high cycle fatigue strength of periodic cellular structures produced by SLM under multiaxial loads. The model is based on a general numerical homogenisation scheme and an explicit description of the Elementary Cell combined to an extreme values analysis making use of a fatigue indicator parameter based on Crossland’s criterion. Also, geometric discrepancy and surface roughness are experimentally characterised and considered in the numerical model using three methods which are compared to the experimental fatigue strength. Topology optimisation (TO) pushes the boundaries of design freedom even further. In our study, Topology Optimisation was developed to prevent fatigue failure using SIMP method revisited and reformulated within the mathematical framework of Non-Uniform Rational BSpline functions.
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Khalil Refai. Effet de la méso-architecture sur le comportement en fatigue des structures lattices optimisées obtenues par fabrication additive. Matériaux. HESAM Université, 2020. Français. ⟨NNT : 2020HESAE028⟩. ⟨tel-02976590⟩

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