Simulation numérique du comportement des matériaux granulaires

Abstract : The theory of continuous media is not sufficient to explain the behaviour of granular materials, so it is necessary to consider the discrete nature of such media. A method that answers such questions is the distinc element method. The numerical simulation of the behaviour of Schneebeli analogical material (2D) and of granular materials (3D) is done by the distinct element method and by using the trubal program in order to reproduce numerically, certain experimental tests of the characterization of granular materials. The biaxial compression test and the simple shear test are done with rolls of PVC and glass and the trixial test is simulated with glass balls. The experimental results validate the method used and enable us to obtain the characteristic parameters of materials by different kinds of loading. The exploitation of numerical results highlights the fundamental role of the intergrain friction and the material density in order to characterize the granular media, enabling the analysis of the phenomenon of dilatance, localization and shear band. Finally, we applied this study to the behaviour of granular materials under push and trust effects, and in the case of ensiled materials
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Seyed Yahya Rohani. Simulation numérique du comportement des matériaux granulaires. Autre. Université Paul Verlaine - Metz, 1995. Français. ⟨NNT : 1995METZ041S⟩. ⟨tel-01777096⟩

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