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Stratégie multiparamétrique pour la conception robuste en fatigue

Abstract : The robust design of mechanical parts consists in modeling the sources of uncertainty.The model becomes fairly representative of the reality in order to reduce safety margins, which guarantee that the operating part will not been at fault.In the case of aerospace parts, a reduction of safety margins is a major economic issue as it leads to a decrease in weight.The probability of failure is a critical quantity in the robust design. It quantifies the risk of failure of the part by comparing the likelihood of resistance of the material (characterized from tests on specimens) with the probability of solicitation of the material, which is determined from external constraints to the part and characteristics of the material. This last problem has been the subject of this thesis.In the case of a non-linear behavior of the material, determining the probability of solicitation requires to run many times a calculation of the part for different values of boundary conditions and parameters values of the material constitutive law.This is quickly becoming out of reach without an appropriate strategy, as one calculation can take up to 12 hours.A strategy dedicated to solving all of these calculations is proposed in this work. It takes advantage of the similarity of the calculations to reduce the total time required. A gain of up to 30 is reached on industrial parts with quasi-static elastic-viscoplastic behavior.
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Submitted on : Monday, February 13, 2012 - 11:47:35 AM
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  • HAL Id : tel-00669449, version 1

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Nicolas Relun. Stratégie multiparamétrique pour la conception robuste en fatigue. Autre. École normale supérieure de Cachan - ENS Cachan, 2011. Français. ⟨NNT : 2011DENS0063⟩. ⟨tel-00669449⟩

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