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Stratégie multiéchelle pour l'analyse du couplage flambage-délaminage de composites stratifiés

Abstract : The presented work, within the framework of the European research project MAAXIMUS (More Affordable Aircraft through eXtended, Integrated and Mature nUmerical Sizing), is dedicated to the numerical prediction of combined buckling and delamination problems in composite laminates. This interaction involves non-linear phenomena of different natures (e.g. local and global buckling of plies, initiation and growth of delamination, contact between delaminated surfaces) resulting in important stiffness loss and instabilities, on very slender geometries due to the scale difference between delaminated areas and the thickness of the plies. Therefore, their prediction leads to very large and highly nonlinear numerical problems that can only be solved using parallel computing techniques.In this context, the Latin (Large Time Increment) multiscale strategy, which is based on a mixed domain decomposition, has many advantages already highlighted in previous works in the case of delamination and contact assuming small perturbations. The aim of this thesis is to include geometric nonlinearities into this existing multiscale framework.A major work has been devoted to overcome the difficulties associated with slender structures. A study of the parameters of the method in the case of bending, buckling, contact between large surfaces and delamination, was performed to optimize the convergence rate, reduce the computation time and ensure the scalability of the strategy.
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Submitted on : Tuesday, October 23, 2012 - 3:27:14 PM
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  • HAL Id : tel-00719119, version 1

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Karin Saavedra Redlich. Stratégie multiéchelle pour l'analyse du couplage flambage-délaminage de composites stratifiés. Autre. École normale supérieure de Cachan - ENS Cachan, 2012. Français. ⟨NNT : 2012DENS0008⟩. ⟨tel-00719119⟩

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