Prise en compte des spécificités des pièces forgées en fatigue illimitée

Abstract : The aim of this work is to use a product-process approach in order to optimize high cycle fatigue properties of forged parts. Then, it is essential to take into account residual stresses and also anisotropic properties of forged parts, to take benefit of the potential properties provided by this forming process. These anisotropic properties depend on the direction of solicitations compared to the grain flow orientation. The behaviours of material containing defects (inclusions above a critical size in our case), for which the fatigue properties depend directly on defects, and materials "without defects", are both studied. In the case of ductile inclusions, the anisotropic properties are mainly induced by the stretching of these inclusions. A modified Murakami criterion is proposed for such materials and the microstructural part of the anisotropy is also studied. In the same time we determine how to model the grain flow orientation in the numerical software Forge3®, which is devoted to the simulation of forming process. This new variable must be used afterwards to calculate the modified criterion. Finally, a full optimization loop including forging and fatigue calculation is carried out on a real part.
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  • HAL Id : tel-00271401, version 1

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Nicolas Caillet. Prise en compte des spécificités des pièces forgées en fatigue illimitée. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2007. Français. ⟨NNT : 2007ENMP1523⟩. ⟨tel-00271401⟩

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