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Structures Under Crash and Impact - Continuum Mechanics, Discretization and Experimental Characterization  
Structures Under Crash and Impact - Continuum Mechanics, Discretization and Experimental Characterization
von: Stefan Hiermaier
Springer-Verlag, 2007
ISBN: 9780387738635
416 Seiten, Download: 11068 KB
 
Format:  PDF
geeignet für: Apple iPad, Android Tablet PC's Online-Lesen PC, MAC, Laptop

Typ: B (paralleler Zugriff)

 

 
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Inhaltsverzeichnis

  Introduction 12  
  Thermo-Mechanical Basics 19  
     Kinematic Equations 19  
        Coordinates and Displacements in Reference Systems 20  
        Deformation Gradients and Displacement Gradients 25  
        Strain Measures 28  
        Material and Spatial Time Derivatives of Deformations 36  
        Strain Rate Tensors 39  
        Compatibility Conditions 43  
     Stress Measures 44  
        Cauchy Stresses 44  
        Alternative Stress Measures 46  
        Rate Dependent Stress Measures 47  
     Descriptions of Static Equilibrium 50  
        Direct Formulation of Equilibrium 50  
        Calculus of Variations 51  
        Equilibrium Formulated as Variational Problem 57  
     Conservation Equations 59  
        Four Ways of Describing Conservation 59  
        Conservation of Mass 61  
        Conservation of Momentum 62  
        Conservation of Energy 64  
        Compressed Formulation of the Conservation Equations 65  
     Variational Solutions of the Balance Equations 66  
        What are Weak Forms? 67  
        Weak Forms of the Equation of Motion 68  
        Hamilton's Principle of Least Action 70  
     Thermodynamic Basics 71  
        Energy Is Conserved - The First Law 71  
        Entropy Increases - The Second Law 72  
        Thermodynamic Potentials 74  
        Formulations of the Clausius-Duhem Inequality 76  
        Consequences for Constitutive Equations 77  
  Constitutive Equations 80  
     Equations of State 81  
        Axiomatic Equations of State 82  
        Empirical Equations of State 84  
     Constitutive Equations for Total Stresses 85  
        Cauchy Elasticity 86  
        General Elastic Anisotropy 87  
        Elasticity with Symmetry Planes 88  
        Green Elasticity - Hyperelastic Behavior 92  
        Some Examples of Hyperelastic Formulations 96  
     Constitutive Equations for Inelastic Deformations 107  
        Basic Terminology in Plasticity Theory 108  
        Selected Yield Criteria 113  
        Flow Rules 121  
        Strain Rate Dependent Yield Criteria 123  
        Plasticity Effects at Shock Compression States 127  
        Meso-Mechanical Calculation of Yield Loci 129  
        Polymers - Nonlinear Elasticity, Initial Plastic Softening, Visco-Plastic Hardening 132  
  Shock Waves and Related Equations of State 153  
     Elastic Wave Propagation in Solids 153  
        Wave Equation and Sound Speeds 154  
        Solution to the One-Dimensional Wave Equation 156  
     Shock Wave Formation 158  
     Shock Wave Propagation in Solids 161  
        Conditions for Shock Waves - Phenomenological Aspects 161  
        Shock Front Dimensions 165  
     Thermo-Mechanics of Shock Waves 166  
        Dispersion - Precondition for Shock Wave Evolution and Stability 166  
        Thermodynamic Conditions upon Shock Wave Transit 168  
        Riemann Problem and Rankine-Hugoniot Equations 169  
        Hugoniot Curves and vS-v1 Relations 173  
        Energy Dissipation upon Shock Wave Transition 177  
     Nonlinear Equations of State for Shock Waves 179  
        Grüneisen Theory for Crystalline Oscillators 180  
        Equations of State for High-Pressure and High-Energy Regimes 181  
        Nonlinear Equations of State for Anisotropic Materials 199  
     Discussion of Nonlinear Equations of State for Shock Waves 211  
        Summary of Shock Thermodynamics 211  
        Influence of Nonlinear EOS Formulations on the Calculated Sound Speed 215  
  Hydrocodes 222  
     Modelling of Dynamic Deformation Processes 222  
     Components of a Hydrocode 224  
        Marching Solutions in Time Steps 225  
     Classification of Partial Differential Equations 225  
     Discretization - The Basic Idea 234  
     Finite Difference Methods 236  
        Time Integration with Finite Difference Schemes 239  
        Explicit or Implicit Time Integration Schemes? 244  
     Finite Volume Method 246  
        Basic Concept of Finite Volume Methods 246  
     Finite Element Method 250  
        Solutions of the Euler-Lagrange Equation 251  
        Ritz Version of Finite Elements 253  
        Finite Elements for Dynamic Problems 256  
        Shape Functions 258  
        Stiffness Matrices, Mass Matrices and Numerical Solution 267  
        Shell Elements 270  
        Finite Element Methodologies for Discontinuities 274  
     Meshfree Methods 278  
        Motivation to Develop Meshfree Methods 278  
        Evolution and Maturing of Meshfree Methods 281  
        Smoothed Particle Hydrodynamics 282  
     Coupling and Adaptive Change of Discretizations 302  
        Meshfree - Finite Element Coupling 302  
        Coupling of Static and Dynamic Solvers 310  
     Shock Wave Simulation with Hydrocodes 310  
        Artificial Viscosity 312  
        Air Blast Effects on Structures 317  
  Failure Models for Dynamic Loading Conditions 322  
     Continuum Damage Mechanics 324  
        Effective Stress and Strain Equivalence Concepts 324  
        Degradation and Damage Accumulation Functions 327  
     Isotropic Failure Models 329  
        Maximum Stress or Strain Criteria 329  
        Gurson Micro-mechanical Model for Ductile Fracture 331  
        Phenomenological Stress Triaxiality Dependent Failure Models 332  
        Brittle Failure 336  
        Spallation Modelling 339  
     Failure Models for Composites 342  
        Analytical Models for Intra-Laminar Failure 344  
        Continuum Damage Based Intra-Laminar Failure Models 351  
        Delamination models 355  
        Discretization Aspects of Composite Failure 357  
  Aspects of Advanced Dynamic Material Testing 360  
     Objectivity of Material Parameter Derivation 360  
     Material Characterization in the Low Dynamic Regime 361  
        Uniaxial Tension to Failure with Optical Strain Measurement 362  
        Shear Failure Characterization 363  
     Material Tests at Moderate Dynamic Strain Rates 367  
        Hopkinson-Bar Facilities 367  
        Direct-Impact Test for Low-Impedance Materials 369  
     Material Characterization at Extreme Strain Rates 372  
        Taylor Anvil-Test 372  
        Flyer-Plate Experiments 376  
        Edge-On Impact Test 384  
  References 387  
  Index 411  


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