DescriptionIntended as a first introduction to the micromechanics of porous media, this book entitled “Microporomechanics” deals with the mechanics and physics of multiphase porous materials at nano and micro scales. It is composed of a logical and didactic build up from fundamental concepts to state-of-the-art theories. It features four parts: following a brief introduction to the mathematical rules for upscaling operations, the first part deals with the homogenization of transport properties of porous media within the context of asymptotic expansion techniques. The second part deals with linear microporomechanics, and introduces linear mean-field theories based on the concept of a representative elementary volume for the homogenization of poroelastic properties of porous materials. The third part is devoted to Eshelby’s problem of ellipsoidal inclusions, on which much of the micromechanics techniques are based, and illustrates its application to linear diffusion and microporoelasticity. Finally, the fourth part extends the analysis to microporo-in-elasticity, that is the nonlinear homogenization of a large range of frequently encountered porous material behaviors, namely, strength homogenization, nonsaturated microporomechanics, microporoplasticity and microporofracture and microporodamage theory.
1. A Mathematical Framework for Upscaling Operations.
1.1 Representative Elementary Volume (rev).
1.2 Averaging Operations.
1.3 Application to Balance Laws.
1.4 The Periodic Cell Assumption.
PART I: MODELING OF TRANSPORT PHENOMENA.
2. Micro(fluid)mechanics of Darcy's Law.
2.1 Darcy's Law.
2.2 Microscopic Derivation of Darcy's law.
2.3 Training Set: Upper and Lower Bounds of the Permeability of a 2-D Microstructure.
2.4 Generalization: Periodic Homogenization Based on Double Scale Expansion.
2.5 Interaction Between Fluid and Solid Phase.
2.6 Beyond Darcy's (Linear) Law.
2.7 Appendix: Convexity of _(d).
3. Micro-to-Macro Diffusive Transport of a Fluid Component.
3.1 Fick's Law.
3.2 Di_usion Without Advection in Steady State Conditions.
3.3 Double Scale Expansion Technique.
3.4 Training Set: Multilayer Porous Medium.
3.5 Concluding Remarks.
PART II: MICROPOROELASTICITY.
4. Drained Microelasticity.
4.1 1-D Thought Model: The Hollow Sphere.
4.3 Estimates of the Homogenized Elasticity Tensor.
4.4 Average and E_ective Strains in the Solid Phase.
4.5 Training Set: Molecular Di_usion in a Saturated Porous Medium.
5. Linear Microporoelasticity.
5.1 Loading Parameters.
5.2 1-D Thought Model: The Saturated Hollow Sphere Model.
5.4 Application: Estimates of the Poroelastic Constants and Average Strain Level.
5.5 Levin's Theorem in Linear Microporoelasticity.
5.6 Training Set: The Two-Scale Double-Porosity Material.
6. Eshelby's Problem in Linear Diffusion and Microporoelasticity.
6.1 Eshelby's Problem in Linear Diffusion.
6.2 Eshelby's Problem in Linear Microelasticity.
6.3 Implementation of Eshelby's Solution in Linear Microporoelasticity.
6.4 Instructive exercise: Anisotropy of Poroelastic Properties Induced by Flat Pores.
6.5 Training Set : New estimates of the homogenized diffusion tensor.
6.6 Appendix: Cylindrical Inclusion in an Isotropic Matrix.
PART III: MICROPOROINELASTICITY.
7. Strength Homogenization.
7.1 1-D Thought Model: Strength Limits of the Saturated Hollow Sphere.
7.2 Macroscopic Strength of an Empty Porous Material.
7.3 Von Mises Behavior of the Solid Phase.
7.4 The Role of Pore Pressure on the Macroscopic Strength Criterion.
7.5 Non Linear Microporoelasticity.
8. Non-Saturated Microporoomechanics.
8.1 The E_ect of Surface Tension at the Fluid-Solid Interface.
8.2 Microporoelasticity in Unsaturated Conditions.
8.3 Training Set: Drying Shrinkage in a Cylindrical Pore Material System.
8.4 Strength Domain of Non-Saturated Porous Media.
9.1 1-D Thought Model: The Saturated Hollow Sphere.
9.2 State Equations of Microporoplasticity.
9.3 Macroscopic Plasticity Criterion.
9.4 Dissipation Analysis.
10. Microporofracture and Damage Mechanics.
10.1 Elements of Linear Fracture Mechanics.
10.2 Dilute Estimates of Linear Poroelastic Properties of Cracked Media.
10.3 Mori-Tanaka Estimates of Linear Poroelastic Properties of
10.4 Micromechanics of Damage Propagation in Saturated Media.
10.5 Training Set: Damage Propagation in Undrained Conditions.
10.6 Appendix : Algebra for Transverse Isotropy and Applications.