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Modélisation multi-échelle d un assemblage riveté aéronautique - Vers un modèle de fragilisation structurale

Abstract : As part of crash simulations, one difficulty concerns the representativeness of material and geometrical non-linear behaviours, especially in the jointed areas. For instance, the mechanical ruin of punched plates is not correctly predicted. ln that sense, the aim of this work is to propose a methodology to formalize and characterize a structural embrittlement model, which will en able to model the structural weakening effects of holes in metallic plates at a macroscopic leve!. The structural embrittlement concept is presented in the first part. Coming from the perforations, the structural embrittlement is defined as the inhomogeneous strain field along the future crack path. The local and nominal strain ratio observed along this crack path enables to measure the embrittlement phenomena. ln the second part, the structural embrittlement mechanisms are analyzed from quasi-static experiments undertaken on punched and not punched samples. The embrittlement model is then formalized and a modelling task is carried out for a better understanding of physical basis of this mode!. The third part is devoted to the development of multiscale tool using a Transformation Field Analysis approach in order to characterize the embrittlement mode!. The elastic developments have shown the feasibility of the method. The plastic behaviour is then implemented in the multiscale model and discussed. Finally, the dependency of the structural model to strain rate is studied using dynamic experiments. Sensitive and insensitive materials are investigated.
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https://tel.archives-ouvertes.fr/tel-00512558
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Submitted on : Monday, August 30, 2010 - 6:44:32 PM
Last modification on : Friday, November 13, 2020 - 8:44:11 AM
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  • HAL Id : tel-00512558, version 1

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Anne-Sophie Bayart. Modélisation multi-échelle d un assemblage riveté aéronautique - Vers un modèle de fragilisation structurale. Mécanique [physics.med-ph]. Université de Valenciennes et du Hainaut-Cambresis, 2005. Français. ⟨tel-00512558⟩

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