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Theses

Modélisation du comportement des poudres métalliques à l'échelle du grain

Abstract : The mechanical behaviour of granular materials, and, in particular, of metal powders, can be studied through discrete simulations, in which the material is modeled as an assembly of discrete particles. The method developped in this thesis consists in the modelling of a powder sample in the finite-element code ABAQUS, as an assembly of spherical meshed particles. The mechanical response of the sample to various loading paths is then simulated. The first part of the present work uses this method to extend the discrete-element method to the modelling of high relative density compaction. The finite-element-based discrete simulations method gives useful information about the non-linear behaviour of the grains at contacts. This information allows the formulation of a contact model which describes the complex interactions between dierent contacts at high relative densities. This model is then implemented in the discrete-element code YADE, so that the results of both methods can be compared. In the last part of this thesis, a numerical sample is submitted to loading paths in every direction of the stress space, to probe macroscopic yield surfaces. The focus is put on the evolution of yield surfaces with complex loading histories including changes in the loading direction, in order to obtain valuable indications on the materials' memory. Moreover, the micromechanical phenomena which cause the macroscopic evolution of yield surfaces can be understood through the observation of the microstructure.
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Contributor : Barthelemy Harthong <>
Submitted on : Monday, December 13, 2010 - 2:22:39 AM
Last modification on : Thursday, November 19, 2020 - 3:54:38 PM
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  • HAL Id : tel-00545807, version 1

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Barthelemy Harthong. Modélisation du comportement des poudres métalliques à l'échelle du grain. Mécanique [physics.med-ph]. Institut National Polytechnique de Grenoble - INPG, 2010. Français. ⟨tel-00545807⟩

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