Digital Materials - Bernacki, Marc

. .

Résumé :

Preface ix
Marc BERNACKI and Samuel FOREST

Chapter 1 Dislocation-based Mechanics: The Various Contributions of Dislocation Dynamics Simulations 1
Sylvain QUEYREAU

1.1. Introduction 1

1.2. Overview of discrete dislocation dynamics 2

1.2.1. Initial configurations and periodic boundary conditions 4

1.2.2. Mobility functions 5

1.2.3. Forces on dislocations 7

1.2.4. Topological changes 11

1.2.5. Boundary conditions 12

1.3. Mesoscale plasticity 15

1.3.1. Forest interactions 17

1.3.2. Statistical investigations of dislocation mechanisms 23

1.3.3. Lattice friction 29

1.3.4. Combination of multiple strengthening mechanisms 32

1.3.5. Toward polycrystalline plasticity 33

1.3.6. Cyclic deformations 40

1.4. Conclusion and future work 43

1.5. Acknowledgments 44

1.6. References 44

Chapter 2 Statistical Approach to the Representative Volume Element Size of Random Composites 55
Dominique JEULIN and Samuel FOREST

2.1. Introduction 55

2.2. Elements of numerical homogenization of heterogeneous media 56

2.2.1. Examples of physical properties of heterogeneous media 56

2.2.2. Change of scale in heterogeneous media 57

2.2.3. Principle of calculation of apparent properties 58

2.2.4. Homogenization of random media by numerical simulations 63

2.3. Statistical definition of the RVE 64

2.3.1. Variance of estimation and integral range 65

2.3.2. Definition of the statistical RVE of apparent properties 67

2.3.3. Practical determination of the size of the RVE 69

2.3.4. Scaling of the bias, or systematic error 70

2.3.5. Determination of the size of the RVE in the nonlinear case 72

2.3.6. Remarks on the reduction of variance 73

2.4. Examples of application 73

2.4.1. Linear elastic properties and thermal conductivity 74

2.4.2. Elastic and viscoelastic properties of nanocomposites 89

2.4.3. Optical properties of nanocomposites 90

2.4.4. Fluid flow and permeability 94

2.4.5. Acoustic properties and wave propagation in fibrous media 95

2.4.6. Nonlinear properties 97

2.5. Conclusion 104

2.6. References 105

Chapter 3 Analytical Micromechanical Methods for Elasto-Viscoplastic Composites and Polycrystals 113
St?phane BERBENNI and Samuel FOREST

3.1. Introduction 113

3.2. Translated field method 116

3.2.1. Field equations and integral equation 116

3.2.2. TF-based method: theoretical foundations 118

3.2.3. TF method for elasto-viscoplastic two-phase composite materials 119

3.2.4. TF method for elasto-viscoplastic polycrystals using the SC scheme 125

3.3. The ?-model dynasty for multiphase elastoviscoplastic polycrystals 127

3.4. Applications of the analytical micromechanical methods 131

3.4.1. Applications of the TF method to composites and polycrystals 131

3.4.2. Applications of ?-models to elastoviscoplastic polycrystals at finite deformations 141

3.5. Concluding remarks 147

3.6. References 148

Chapter 4 Vertex and Front-Tracking Methods for the Modeling of Microstructure Evolution at the Solid State 155
Marc BERNACKI

4.1. Introduction 155

4.2. Vertex frameworks 156

4.3. From Vertex to front-tracking then to enriched Vertex frameworks 160

4.4. Enrichment of the Vertex approach 163

4.5. Other front-tracking frameworks for the modeling of microstructure evolution 169

4.6. Conclusion 173

4.7. References 173

Chapter 5 Phase Field: Theory, Numerical Implement...