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Chapter and Conference Paper
Microstructural Effects on Strain Localization in a Multiscale Model for Hydro-Mechanical Coupling
The formulation and implementation of a double-scale finite element model for hydro-mechanical coupling in the framework of the finite element squared method has allowed studying macroscale boundary value prob...
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Article
Signe de Westermark et embolie pulmonaire
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Chapter and Conference Paper
Hydromechanical Modelling of an Initial Boundary Value Problem: Studies of Non-uniqueness with a Second Gradient Continuum
A non-uniqueness study for a hydromechanical boundary value problem is performed. A fully saturated porous medium is considered using an elasto-plastic constitutive equations to describe the mechanical behavio...
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Chapter and Conference Paper
Modelling Hydromechanical Dilation Geomaterial—Cavitation and Localization
This paper presents an extension of the local second gradient model to multiphasic materials (solid particles, air, water) and including the cavitation phenomenon. This new development was made in order to mod...
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Chapter and Conference Paper
A FE2 Model for Hydro-mechanical Coupling
A new approach is investigated for the modelling of the hydro-mechanical behaviour of Callovo-Oxfordian claystone, a potential host rock for radioactive waste repositories in France. This approach is a double-...
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Article
A two-scale poromechanical model for cohesive rocks
This paper presents a computational homogenization approach in the framework of poromechanics. A fully coupled hydromechanics problem is formulated at the macroscopic scale. The constitutive equations are repl...
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Chapter and Conference Paper
2D and 3D Modelling of Geomaterials Using a Second Gradient Dilation Model
This paper deals with some recent results obtained with a simplified second gradient model to simulate localized patterns. The simplification is based on the use of the gradient of the volume variation only. I...
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Chapter and Conference Paper
Instability and Bifurcation for Inelastic Geomaterials
During the past issues of the workshop on localization and bifurcation in soils and rocks, the two words instability and bifurcation are used by many participants and induce many strong discussions. I am convi...
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Chapter and Conference Paper
Local Second Gradient Models for Thermo-Hydro-Mechanical Coupling in Rock Like Materials
In the design of nuclear waste disposals, an important topic concerns the evolution of an Excavated Damage Zone (EDZ) with a thermal exchanges. In this paper, a new model of local second gradient coupling with...
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Chapter and Conference Paper
Analytical Evidence of Shear Band Bifurcations for Softening Materials
Strain localization is a phenomenon occurring very often in anelastic media close to rupture and it is very important to take it into account in most of applications, particularly in geotechnics. Strain locali...
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Article
Shear softening and localization: Modelling the evolution of the width of the shear zone
In this paper, the question of shear localization inside a band is revisited. Using simplified constitutive equations we look at a 1D layer in a classical medium. Even though the example is simple, we show onc...
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Chapter
Local Second Gradient Models and Damage Mechanics: 1D Post-Localization Studies in Concrete Specimens
Continuum damage mechanics is often used as a framework for describing the variations of the elastic properties of due to micro-structural degradations. Experimentally, concrete specimens exhibit a network of ...
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Chapter
Micro-Fracture Instabilities in Granular Solids
We study the appearance of instable behaviors (like strain localization bands) in elastic solids, as a consequence of micro-fracture. A two-scale approach of computational homogenization is considered. The mac...
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Chapter and Conference Paper
Microfracture and Strain Localization: A Computational Homogenization Approach
The aim of this work is to study the appearance instable behaviours (like strain localisation bands) in elastic solids, as a consequence of micro-fracture. A two-scale approach of computational homogenization ...
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Chapter and Conference Paper
Modeling the Post-localization Regime with Local Second Gradient Models: Non-uniqueness of Solutions and Nonpersistent Shear Bands
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Chapter
Microstructured materials: local constitutive equation with internal lenght, theoretical and numerical studies
Starting from the theory of microstrucured materials, a local second gradient theory is developed by adding to the theory kinematical constraints. Using these constraints to eliminate some variables is one way...
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Chapter
Uniqueness, second order work and bifurcation in hypoplasticity
This paper is mainly a review of known and proved results about boundary value problems involving hypoplastic models. In order to carry out this task, boundary value problems are first classified. Uniqueness (...
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Chapter
A review of two different approaches to hypoplasticity
Non-linearity and irreversibility are striking features of soil behavior, affecting the response of any geotechnical “structure”, be it, for example, a foundation, an excavation, an earth dam, or a natural slo...
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Article
Effects of ozonation on mutagenic activity of nitrosamines
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Article
Shear band analysis for granular materials: The question of incremental non-linearity
Shear band analysis is a theoretical approach for the phenomenon of deformation localization, a characteristic aspect of rupture in geomaterials. It is closely related to advanced soil modelling, because the c...
