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Contribution à l'amélioration des connaissances des phénomènes d'interaction fluide/structure à l'intérieur de la boîte crânienne soumise à une sollicitation dynamique : études expérimentale et numérique

Abstract : The aim of this study is to enhance the knowledge of fluid/structure interaction phenomena that governs brain movement inside the head subjected to a transient loading. An experimental protocol has been developed to understand the coupling phenomenon between a deformable structure (brain) and a fluid (cerebrospinal fluid (CSF)). A simplified physical head model subjected to an angular acceleration has been developed. This model consists of an aluminium cylinder filled with a silicone gel simulating the brain, either detached from the vessel or not by a layer of water representing the CSF. Complete kinematics of the model, displacements and strains induced in the gel has been determined by optical measurements. Fluid influence on gel kinematics is evaluated by comparing gel responses for the models with and without water. When a fluid layer prevents the gel to stick to the vertical walls of the aluminium vessel, displacements and strains inside the gel are lower than those observed for the model without water, while external movements of the gel with respect to the aluminium vessel are more important for the model with water. This can be explained by the fact that the gel mainly exhibits a rigid body motion in the model with water because the gel is free to rotate relatively to the vertical walls of the rigid model. For the model without water, the gel sticks to the aluminium vessel walls and its movement is restrained. In parallel, results from experimental study are used to estimate the capacity of actual FE codes to simulate the physical phenomena observed, as well as proposed modelling options for CSF/brain coupling representation
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https://hal-uphf.archives-ouvertes.fr/tel-03001231
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Submitted on : Thursday, November 12, 2020 - 12:01:38 PM
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Audrey Hault-Dubrulle. Contribution à l'amélioration des connaissances des phénomènes d'interaction fluide/structure à l'intérieur de la boîte crânienne soumise à une sollicitation dynamique : études expérimentale et numérique. Génie mécanique [physics.class-ph]. Université de Valenciennes et du Hainaut-Cambrésis, UVHC, (France), 2007. Français. ⟨NNT : 2007VALE0018⟩. ⟨tel-03001231⟩

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