At a Glance
492 Pages
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Atomistic Modeling of Materials Failure is an introduction to molecular and atomistic modeling techniques applied to solid fracture and deformation. Focusing on a variety of brittle, ductile, geometrically confined and biological materials, this detailed overview includes computational methods at the atomic scale, and describes how these techniques can be used to model the dynamics of cracks and other deformation mechanisms.
A full description of molecular dynamics (MD) as a numerical modeling tool covers the use of classical interatomic potentials and implementation of large-scale massively parallelized computing facilities in addition to the general philosophies of model building, simulation, interpretation and analysis of results. Readers will find an analytical discussion of the numerical techniques along with a review of required mathematical and physics fundamentals. Example applications for specific materials (such as silicon, copper, fibrous proteins) are provided as case studies for each of the techniques, areas and problems discussed.
Providing an extensive review of multi-scale modeling techniques that successfully link atomistic and continuum mechanical methods, Atomistic Modeling of Materials Failure is a valuable reference for engineers, materials scientists, and researchers in academia and industry.
List of Figures | p. XVII |
List of Tables | p. LXIII |
Nomenclature | p. LXV |
Introduction | |
Introduction | p. 3 |
Materials Deformation and Fracture Phenomena: Why and How Things Break | p. 5 |
Strength of Materials: Flaws, Defects, and a Perfect Material | p. 6 |
Crystal Structures and Molecular Packing | p. 8 |
Cracks | p. 10 |
Dislocations | p. 10 |
Other Defects in Crystals and Other Structures | p. 12 |
Brittle vs. Ductile Material Behavior | p. 12 |
The Need for Atomistic Simulations | p. 15 |
Applications: Experimental and Computational Mechanics | p. 18 |
Experimental Techniques | p. 18 |
Example Applications: The Significance of Mechanics | p. 20 |
Outline of This Book | p. 27 |
Basics of Atomistic, Continuum and Multiscale Methods | |
Basic Atomistic Modeling | p. 31 |
Introduction | p. 31 |
Modeling and Simulation | p. 32 |
Model Building and Physical Representation | p. 34 |
The Concept of Computational Experiments | p. 35 |
Basic Statistical Mechanics | p. 36 |
Formulation of Classical Molecular Dynamics | p. 37 |
Integrating the Equations of Motion | p. 39 |
Thermodynamic Ensembles and Their Numerical Implementation | p. 40 |
Energy Minimization | p. 43 |
Monte Carlo Techniques | p. 44 |
Classes of Chemical Bonding | p. 46 |
The Interatomic Potential or Force Field: Introduction | p. 48 |
Pair Potentials | p. 50 |
Multibody Potentials: Embedded Atom Method for Metals | p. 54 |
Force Fields for Biological Materials and Polymers | p. 56 |
Bond Order and Reactive Potentials | p. 59 |
Limitations of Classical Molecular Dynamics | p. 68 |
Numerical Implementation | p. 69 |
Periodic Boundary Conditions | p. 70 |
Force Calculation | p. 71 |
Neighbor Lists and Bins | p. 72 |
Property Calculation | p. 73 |
Temperature Calculation | p. 73 |
Pressure Calculation | p. 74 |
Radial Distribution Function | p. 74 |
Mean Square Displacement Function | p. 75 |
Velocity Autocorrelation Function | p. 76 |
Virial Stress Tensor | p. 76 |
Large-Scale Computing | p. 78 |
Historical Development of Computing Power | p. 79 |
Parallel Computing | p. 80 |
Discussion | p. 82 |
Visualization and Analysis Methods | p. 83 |
Energy Method | p. 85 |
Centrosymmetry Parameter | p. 86 |
Slip Vector | p. 88 |
Measurement of Defect Speed | p. 89 |
Visualization Methods for Biological Structures | p. 89 |
Other Methods | p. 90 |
Distinguishing Modeling and Simulation | p. 90 |
Application of Mechanical Boundary Conditions | p. 90 |
Summary | p. 93 |
Basic Continuum Mechanics | p. 95 |
Newton's Laws of Mechanics | p. 95 |
Definition of Displacement, Stress, and Strain | p. 97 |
Stress Tensor | p. 99 |
Equilibrium Conditions | p. 100 |
Strain Tensor | p. 103 |
Energy Approach to Elasticity | p. 105 |
Isotropic Elasticity | p. 107 |
Nonlinear Elasticity or Hyperelasticity | p. 108 |
Elasticity of a Beam | p. 110 |
Reduction Formulas | p. 110 |
Equilibrium Equations | p. 111 |
Example: Solution of a Simple Beam Problem | p. 112 |
Calculation of Internal Stress Field | p. 113 |
Differential Beam Equations | p. 116 |
The Need for Atomistic Elasticity: What's Next | p. 119 |
Atomistic Elasticity: Linking Atoms and Continuum | p. 121 |
Thermodynamics as Bridge Between Atomistic and Continuum Viewpoints | p. 121 |
The Atomic and Molecular Origin of Elasticity: Entropic vs. Energetic Sources | p. 122 |
The Virial Stress and Strain | p. 123 |
Elasticity Due to Energetic Contributions | p. 124 |
Cauchy-Born Rule | p. 124 |
Elasticity of a One-Dimensional String of Atoms | p. 126 |
Elasticity and Surface Energy of a Two-Dimensional Triangular Lattice | p. 128 |
Elasticity and Surface Energy of a Three-Dimensional FCC Lattice | p. 142 |
Concluding Remarks | p. 149 |
Elasticity Due to Entropic Contributions | p. 149 |
Elasticity of Single Molecules: Worm-Like-Chain Model | p. 150 |
Elasticity of Polymers | p. 152 |
Discussion | p. 154 |
Multiscale Modeling and Simulation Methods | p. 157 |
Introduction | p. 157 |
Direct Numerical Simulation vs. Multiscale and Multiparadigm Modeling | p. 158 |
Differential Multiscale Modeling | p. 159 |
Detailed Description of Selected Multiscale Methods to Span Vast Lengthscales | p. 160 |
Examples of Hierarchical Multiscale Coupling | p. 160 |
Concurrent Integration of Tight-Binding, Empirical Force Fields and Continuum Theory | p. 162 |
The Quasicontinuum Method and Related Approaches | p. 165 |
Continuum Approaches Incorporating Atomistic Information | p. 168 |
Hybrid ReaxFF Model: Integration of Chemistry and Mechanics | p. 169 |
Advanced Molecular Dynamics Techniques to Span Vast Timescales | p. 175 |
Discussion | p. 180 |
Material Deformation and Failure | |
Deformation and Dynamical Failure of Brittle Materials | p. 185 |
The Nature of Brittle Fracture | p. 186 |
Basics of Linear Elastic Fracture Mechanics | p. 189 |
Energy Balance Considerations: Griffith's Model of Fracture | p. 189 |
Asymptotic Stress Field and Stress Intensity Factor | p. 194 |
Crack Limiting Speed in Dynamic Fracture | p. 196 |
Atomistic Modeling of Brittle Materials | p. 197 |
A One-Dimensional Example of Brittle Fracture: Joint Continuum-Atomistic Approach | p. 201 |
Introduction | p. 202 |
Linear-Elastic Continuum Model | p. 204 |
Hyperelastic Continuum Mechanics Model for Bilinear Stress-Strain Law | p. 207 |
Molecular Dynamics Simulations of the One-Dimensional Crack Model: The Harmonic Case | p. 211 |
Molecular Dynamics Simulations of the One-Dimensional Crack Model: The Supersonic Case | p. 217 |
Discussion and Conclusions | p. 219 |
Stress and Deformation Field near Rapidly Propagating Mode I Cracks in a Harmonic Lattice | p. 223 |
Stress and Deformation Fields | p. 225 |
Energy Flow near the Crack Tip | p. 227 |
Limiting Velocities of Mode I Cracks in Harmonic Lattices | p. 229 |
Summary | p. 230 |
Crack Limiting Speeds of Cracks: The Significance of Hyperelasticity | p. 234 |
Modeling | p. 236 |
Crack Speed and Energy Flow | p. 238 |
Hyperelastic Area | p. 239 |
How Fast can Cracks Propagate? | p. 242 |
Characteristic Energy Length Scale in Dynamic Fracture | p. 244 |
Summary | p. 248 |
Crack Instabilities and Hyperelastic Material Behavior | p. 249 |
Introduction | p. 251 |
Design of Computational Model | p. 252 |
Computational Experiments | p. 255 |
Discussion and Conclusion | p. 258 |
Suddenly Stopping Cracks: Linking Atomistic Modeling, Theory, and Experiment | p. 260 |
Introduction | p. 260 |
Theoretical Background of Suddenly Stopping Cracks | p. 262 |
Atomistic Simulation Setup | p. 264 |
Atomistic Simulation Results of a Suddenly Stopping Mode I Crack | p. 268 |
Atomistic Simulation Results of a Suddenly Stopping Mode II Crack | p. 278 |
Discussion | p. 286 |
Crack Propagation Along Interfaces of Dissimilar Materials | p. 287 |
Mode I Dominated Cracks at Bimaterial Interfaces | p. 289 |
Mode II Cracks at Bimaterial Interfaces | p. 294 |
Summary | p. 297 |
Dynamic Fracture Under Mode III Loading | p. 299 |
Atomistic Modeling of Mode III Cracks | p. 300 |
Mode III Cracks in a Harmonic Lattice - The Reference Systems | p. 300 |
Mode III Crack Propagation in a Thin Stiff Layer Embedded in a Soft Matrix | p. 301 |
Suddenly Stopping Mode III Crack | p. 303 |
Discussion | p. 303 |
Brittle Fracture of Chemically Complex Materials | p. 304 |
Introduction | p. 305 |
Hybrid Atomistic Modeling of Cracking in Silicon: Mixed Hamiltonian Gormulation | p. 307 |
Atomistic Model | p. 307 |
Simulation Results | p. 308 |
Dynamical Fracture Mechanisms | p. 311 |
Reactive Chemical Processes and Fracture Initiation | p. 316 |
Summary | p. 317 |
Summary: Brittle Fracture | p. 320 |
Hyperelasticity can Govern Dynamic Fracture | p. 323 |
Interfaces and Geometric Confinement | p. 326 |
Deformation and Fracture of Ductile Materials | p. 327 |
Introduction | p. 327 |
Continuum Theoretical Concepts of Dislocations and Their Interactions | p. 328 |
Properties of Dislocations | p. 329 |
Forces on Dislocations | p. 331 |
Rice-Thomson Model for Dislocation Nucleation | p. 332 |
Rice-Peierls Model | p. 337 |
Link with Atomistic Concepts | p. 338 |
Generalized Stacking Fault Curves | p. 338 |
Linking Atomistic Simulation Results to Continuum Mechanics Theories of Plasticity | p. 339 |
Modeling Plasticity Using Large-Scale Atomistic Simulations | p. 341 |
Case Study: Deformation Mechanics of Model FCC Copper - LJ Potential | p. 343 |
Model Setup | p. 343 |
Visualization Procedure | p. 345 |
Simulation Results | p. 345 |
Summary | p. 355 |
Case Study: Deformation Mechanics of a Nickel Nanocrystal - EAM Potential | p. 357 |
Case Study: Multi-Paradigm Modeling of Chemical Complexity in Mechanical Deformation of Metals | p. 359 |
Atomistic Model and Validation | p. 360 |
Example Application: Modeling Hybrid Metal-Organic Systems | p. 364 |
Deformation and Fracture Mechanics of Geometrically Confined Materials | p. 373 |
Introduction | p. 373 |
Thin Metal Films and Nanocrystalline Metals | p. 381 |
Constrained Diffusional Creep in Ultra-Thin Metal Films | p. 385 |
Single Edge Dislocations in Nanoscale Thin Films | p. 390 |
Rice-Thompson Model for Nucleation of Parallel Glide Dislocations | p. 393 |
Discussion and Summary | p. 396 |
Atomistic Modeling of Constrained Grain Boundary Diffusion in a Bicrystal Model | p. 396 |
Introduction and Modeling Procedure | p. 397 |
Formation of the Diffusion Wedge | p. 400 |
Development of the Crack-Like Stress Field and Nucleation of Parallel Glide Dislocations | p. 402 |
Discussion | p. 404 |
Summary | p. 408 |
Dislocation Nucleation from Grain Triple Junction | p. 408 |
Atomistic Modeling of the Grain Triple Junction | p. 409 |
Atomistic Simulation Results | p. 410 |
Discussion | p. 414 |
Atomistic Modeling of Plasticity of Polycrystalline Thin Films | p. 414 |
Atomistic Modeling of Polycrystalline Thin Films | p. 415 |
Atomistic Simulation Results | p. 416 |
Plasticity of Nanocrystalline Bulk Materials with Twin Lamella | p. 422 |
Modeling of Constrained Diffusional Creep in Polycrystalline Films | p. 426 |
Discussion | p. 428 |
Summary: Results of Modeling of Thin Films | p. 430 |
Use of Atomistic Simulation Results in Hierarchical Multiscale Modeling | p. 432 |
Mechanisms of Plastic Deformation of Ultra-thin Uncapped Copper Films | p. 434 |
Deformation Map of Thin Films | p. 434 |
Yield Stress in Ultra-Thin Copper Films | p. 435 |
The Role of Interfaces and Geometric Confinement | p. 436 |
Deformation and Fracture Mechanics of Carbon Nanotubes | p. 438 |
Mesoscale Modeling of CNT Bundles | p. 441 |
Mesoscale Simulation Results | p. 444 |
Discussion | p. 445 |
Flaw-Tolerant Nanomaterials: Bulk Fracture and Deformation | p. 446 |
Strength of Brittle Nanoparticles | p. 446 |
Simulation Results | p. 450 |
Nanoscale Adhesion Systems | p. 452 |
Strength of Fibrillar Adhesion Systems | p. 453 |
Theoretical Considerations of Shape Optimization of Adhesion Elements | p. 455 |
Atomistic Modeling | p. 456 |
Simulation Results | p. 457 |
Summary | p. 460 |
References | p. 463 |
Index | p. 483 |
Table of Contents provided by Ingram. All Rights Reserved. |
ISBN: 9780387764252
ISBN-10: 0387764259
Published: 10th September 2008
Format: Hardcover
Language: English
Number of Pages: 492
Audience: Professional and Scholarly
Publisher: Springer-Verlag New York Inc.
Country of Publication: US
Dimensions (cm): 23.5 x 15.5 x 3.02
Weight (kg): 0.91
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