Une stratégie de calcul pour les structures fissurées : Analyse locale-globale et approche multiéchelle pour la fissuration.

Abstract : During the fatigue damage tolerance check of aeronautical structures, the crack velocity estimation of existing cracks enables to evaluate the residual keeping of the structure and to determine checking intervals and necessary maintenance stages. A full analysis using a detailed finite element model for the whole structure can not be reasonably performed. Thus, detailed analyses are carried out in the cracked zones only and included in a general coarse discretization of the aircraft. In this work, a multiscale strategy is proposed to solve the local global analysis issue for crack propagation while avoiding meshing difficulties. Two techniques are put into synergy : a multiscale strategy based on a domain decomposition method is proposed to efficiently account for the strain localization in the cracked zone, and a local enrichment technique, the X-FEM, is used to describe the geometry of the crack independently of the mesh.
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Submitted on : Friday, July 6, 2007 - 11:07:01 AM
Last modification on : Friday, May 17, 2019 - 1:23:11 AM
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  • HAL Id : tel-00160509, version 1

Citation

Pierre-Alain Guidault. Une stratégie de calcul pour les structures fissurées : Analyse locale-globale et approche multiéchelle pour la fissuration.. Mécanique [physics.med-ph]. École normale supérieure de Cachan - ENS Cachan, 2005. Français. ⟨tel-00160509⟩

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