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A numerical model for the two-phase composites matrix-rigid inclusions: Application to the determination of the elstic and fatigue properties of the bituminous materials

Adel Lachihab
Abstract : A discrete 3D model for the elastic behavior of random aggregate composites has been proposed. The aggregates are rigid particles embedded into an elastic matrix. The inter-particle contact layers are modeled by an elastic interface constitutive equation. The Dirichlet tessellation and its dual Delaunay network are used to connect the neighboring particles. A discrete homogenization method is used to estimate the linear effective properties of the material. The validity and limitations of the model have been discussed through comparisons with finite element simulations on regular periodic unit cells in the limit case of rigid inclusions. The proposed model has been applied to random microstructures generated by the Voronoï tessellation. Firstly, the minimum RVE size for the (not weighted) Voronoï tessellation model has been numerically determined. Secondly, a fatigue damage law has been introduced into the interfaces in order to determine the minimum RVE size in the fatigue damage case. Lastly, the proposed model has been used in the study of the influence of the morphological characteristics on the effective properties of the material.
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Contributor : Ecole Des Ponts Paristech <>
Submitted on : Monday, February 14, 2005 - 8:00:00 AM
Last modification on : Monday, February 14, 2005 - 8:00:00 AM
Long-term archiving on: : Thursday, September 30, 2010 - 6:20:26 PM

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Adel Lachihab. A numerical model for the two-phase composites matrix-rigid inclusions: Application to the determination of the elstic and fatigue properties of the bituminous materials. Engineering Sciences [physics]. Ecole des Ponts ParisTech, 2004. English. ⟨pastel-00001036⟩

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