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Modélisation et simulation numérique du couplage entre les milieux discrets et continus

Abstract : The main objective of the modeling of modern materials is to predict the response and failure of materials which are governed by deformation mechanisms. For many material simulations, it is very difficult to make a discrete calculation because of large Representative Volume Element sizes and important computation times. Moreover, using only a continuum approach does not always provide an accurate simulation for the response of the system being studied. These two main problems forced researchers to reconsider the advantages of each approach and to recognize that a coupling methodology had to be established that would combine the advantages of both discrete and continuum modelings. In my thesis, a coupling methodology was developped and validated through two models : railway track model and a masonry model. Numerical tools are proposed in this study to clarify the choice of the kind of scale simulations for various domains. The efficiency of coupling methodology is proved by the good match between the discrete and the coupling behaviors, and the gain in the number of elements which implies a reduction in the computation time compared to that needed in the discrete approach. In addition to these conclusions, the absence of the spurious wave at the interface of coupling is also noted. Many future works are proposed as like as the dynamic study of the masonry model.
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Submitted on : Thursday, April 1, 2010 - 3:17:53 PM
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  • HAL Id : tel-00469475, version 1


Mohammad Hammoud. Modélisation et simulation numérique du couplage entre les milieux discrets et continus. Matériaux. Ecole Nationale des Ponts et Chaussées, 2009. Français. ⟨tel-00469475⟩



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