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Identification à partir de mesures de champs : application de l'erreur en relation de comportement modifiée

Abstract : The identification of material properties based on the confrontation between the experimental data and their numerical counterpart needs to pay special attention to their reliability and then to take some precautions. Especially, when dealing with full-field measurements which provide rich kinematic information enabling new possibilities for the characterization of material constitutive parameters. The aim of this work is to discuss the identification of the elastic parameters, for either homogeneous or heterogeneous materials, leading to the more general problem of the taking into account of noisy experimental data and strong model hypotheses. Two different approaches are addressed in this study. The first one consists in the processing of the experimental data upstream of the identification stage, by filtering them through a diffuse approximation algorithm. The second approach focuses on the development of an inverse identification strategy from static tests. This method takes into account the uncertainty of the measurements from the beginning of the formulation and is based on the modified constitutive relation error principles. It involves the resolution of non standard finite element problems using specific resolution methods. The study pointed out the robustness of the proposed method towards measurement errors, in particular when compared to the finite element model updating method.
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Mouldi Ben Azzouna. Identification à partir de mesures de champs : application de l'erreur en relation de comportement modifiée. Autre. Université de Technologie de Compiègne, 2013. Français. ⟨NNT : 2013COMP2127⟩. ⟨tel-00968138⟩

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