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1st Edition, Volume 18 - January 1, 1976

Author: W.N. Findley

Language: EnglisheBook ISBN:

9 7 8 - 0 - 4 4 4 - 6 0 1 9 2 - 6

Creep and Relaxation of Nonlinear Viscoelastic Materials with an Introduction to Linear Viscoelasticity deals with nonlinear viscoelasticity, with emphasis on creep and stress… Read more

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Creep and Relaxation of Nonlinear Viscoelastic Materials with an Introduction to Linear Viscoelasticity deals with nonlinear viscoelasticity, with emphasis on creep and stress relaxation. It explains the concepts of elastic, plastic, and viscoelastic behavior, along with creep, recovery, relaxation, and linearity. It also describes creep in a variety of viscoelastic materials, such as metals and plastics. Organized into 13 chapters, this volume begins with a historical background on creep, followed by discussions about strain and stress analysis, linear viscoelasticity, linear viscoelastic stress analysis, and oscillatory stress and strain. It methodically walks the reader through topics such as the multiple integral theory with simplifications to single integrals, incompressibility and linear compressibility, and the responses of viscoelastic materials to stress boundary conditions (creep), strain boundary conditions (relaxation), and mixed stress and strain boundary conditions (simultaneous creep and relaxation). The book also looks at the problem of the effect of temperature, especially variable temperature, on nonlinear creep, and describes methods for the characterization of kernel functions, stress analysis of nonlinear viscoelastic materials, and experimental techniques for creep and stress relaxation under combined stress. This book is a useful text for designers, students, and researchers.

PrefaceChapter 1. Introduction 1.1 Elastic Behavior 1.2 Plastic Behavior 1.3 Viscoelastic Behavior 1.4 Creep 1.5 Recovery 1.6 Relaxation 1.7 LinearityChapter 2. Historical Survey of Creep 2.1 Creep of Metals 2.2 Creep under Uniaxial Stress 2.3 Creep under Combined Stresses 2.4 Creep under Variable Stress 2.5 Creep of Plastics 2.6 Mathematical Representation of Creep of Materials 2.7 Differential Form 2.8 Integral Form 2.9 Development of Nonlinear Constitutive RelationsChapter 3. State of Stress and Strain 3.1 State of Stress 3.2 Stress Tensor 3.3 Unit Tensor 3.4 Principal Stresses 3.5 Mean Normal Stress Tensor and Deviatoric Stress Tensor 3.6 Invariants of Stress 3.7 Traces of Tensors and Products of Tensors 3.8 Invariants in Terms of Traces 3.9 Hamilton-Cayley Equation 3.10 State of Strain 3.11 Strain-Displacement Relation 3.12 Strain TensorChapter 4. Mechanics of Stress and Deformation Analyses 4.1 Introduction 4.2 Law of Motion 4.3 Equations of Equilibrium 4.4 Equilibrium of Moments 4.5 Kinematics 4.6 Compatibility Equations 4.7 Constitutive Equations 4.8 Linear Elastic Solid 4.9 Boundary Conditions 4.10 The Stress Analysis Problem in a Linear Isotropic Elastic SolidChapter 5. Linear Viscoelastic Constitutive Equations 5.1 Introduction 5.2 Viscoelastic Models 5.3 The Basic Elements: Spring and Dashpot 5.4 Maxwell Model 5.5 Kelvin Model 5.6 Burgers or Four-element Model 5.7 Generalized Maxwell and Kelvin Models 5.8 Retardation Spectrum for tn 5.9 Differential Form of Constitutive Equations for Simple Stress States 5.10 Differential Form of Constitutive Equations for Multiaxial Stress States 5.11 Integral Representation of Viscoelastic Constitutive Equations 5.12 Creep Compliance 5.13 Relaxation Modulus 5.14 Boltzmann's Superposition Principle and Integral Representation 5.15 Relation Between Creep Compliance and Relaxation Modulus 5.16 Generalization of the Integral Representation to Three-Dimensions 5.17 Behavior of Linear Viscoelastic Material under Oscillating Loading 5.18 Complex Modulus and Compliance 5.19 Dissipation 5.20 Complex Compliance and Complex Modulus of Some Viscoelastic Models 5.21 Maxwell Model 5.22 Kelvin Model 5.23 Burgers Model 5.24 Relation Between the Relaxation Modulus and the Complex Relaxation Modulus 5.25 Relation Between Creep Compliance and Complex Compliance 5.26 Complex Compliance for tn 5.27 Temperature Effect and Time-Temperature Superposition PrincipleChapter 6. Linear Viscoelastic Stress Analysis 6.1 Introduction 6.2 Beam Problems 6.3 Stress Analysis of Quasi-static Viscoelastic Problems Using the Elastic-Viscoelastic Correspondence Principle 6.4 Thick-walled Viscoelastic Tube 6.5 Point Force Acting on the Surface of a Semi-infinite Viscoelastic Solid 6.6 Concluding RemarksChapter 7. Multiple Integral Representation 7.1 Introduction 7.2 Nonlinear Viscoelastic Behavior under Uniaxial Loading 7.3 Nonlinear Viscoelastic Behavior under Multiaxial Stress State 7.4 A Linearly Compressible Material 7.5 Incompressible Material Assumption 7.6 Linearly Compressible, II 7.7 Constant Volume 7.8 Incompressible and Linearly Compressible Creep in Terms of σ 7.9 Incompressible and Linearly Compressible Relaxation in Terms of ε 7.10 Constitutive Relations under Biaxial Stress and Strain 7.11 Constitutive Relations under Uniaxial Stress and Strain 7.12 Strain Components for Biaxial and Uniaxial Stress States, Compressible Material 7.13 Strain Components for Biaxial and Uniaxial Stress States, Linearly Compressible Material 7.14 Stress Components for Biaxial and Uniaxial Strain States 7.15 Approximating Nonlinear Constitutive Equations under Short Time Loading 7.16 Superposed Small Loading on a Large Constant Loading 7.17 Other Representations 7.18 Finite Linear Viscoelasticity 7.19 Elastic Fluid Theory 7.20 Thermodynamic Constitutive TheoryChapter 8. Nonlinear Creep at Constant Stress and Relaxation at Constant Strain 8.1 Introduction 8.2 Constitutive Equations for 3 ×3 Matrix 8.3 Components of Strain for Creep at Constant Stress 8.4 Components of Stress for Relaxation at Constant Strain 8.5 Biaxial Constitutive Equations for 2 ×2 Matrix 8.6 Components of Strain (or Stress) for Biaxial States for 2 ×2 Matrix 8.7 Constitutive Equations for Linearly Compressible Material 8.8 Components of Strain for Creep of Linearly Compressible Material 8.9 Components of Stress for Relaxation of Linearly Compressible Material 8.10 Poisson's Ratio 8.11 Time Functions 8.12 Determination of Kernel Functions for Constant Stress Creep 8.13 Determination of Kernel Functions for Constant-Strain Stress-Relaxation 8.14 Experimental Results of CreepChapter 9. Nonlinear Creep (or Relaxation) Under Variable Stress (or Strain) 9.1 Introduction 9.2 Direct Determination of Kernel Functions 9.3 Product-Form Approximation of Kernel Functions 9.4 Additive Forms of Approximation of Kernel Functions 9.5 Modified Superposition Method 9.6 Physical Linearity Approximation of Kernel Functions 9.7 ComparisonChapter 10. Conversion and Mixing of Nonlinear Creep and Relaxation 10.1 Introduction 10.2 Relation Between Creep and Stress Relaxation for Uniaxial Nonlinear Viscoelasticity 10.3 Example: Prediction of Uniaxial Stress Relaxation from Creep of Nonlinear Viscoelastic Material 10.4 Relation Between Creep and Relaxation for Biaxial Nonlinear Viscoelasticity 10.5 Behavior of Nonlinear Viscoelastic Material under Simultaneous Stress Relaxation in Tension and Creep in Torsion 10.6 Prediction of Creep and Relaxation under Arbitrary InputChapter 11. Effect of Temperature on Nonlinear Viscoelastic Materials 11.1 Introduction 11.2 Nonlinear Creep Behavior at Elevated Temperatures 11.3 Determination of Temperature Dependent Kernel Functions 11.4 Creep Behavior under Continuously Varying Temperature-Uniaxial Case 11.5 Creep Behavior under Continuously Varying Temperature for Combined Tension and Torsion 11.6 Thermal Expansion InstabilityChapter 12. Nonlinear Viscoelastic Stress Analysis 12.1 Introduction 12.2 Solid Circular Cross-section Shaft under Twisting 12.3 Beam under Pure Bending 12.4 Thick-walled Cylinder under Axially Symmetric LoadingChapter 13. Experimental Methods 13.1 Introduction 13.2 Loading Apparatus for Creep 13.3 Load Application 13.4 Test Specimen 13.5 Uniform Stressing or Straining 13.6 Strain Measurement 13.7 Temperature Control 13.8 Humidity and Temperature Controlled Room 13.9 Internal Pressure 13.10 Strain Control and Stress Measurement for Relaxation 13.11 A Machine for Combined Tension and TorsionAppendix A1. List of SymbolsAppendix A2. Mathematical Description of Nonlinear Viscoelastic Constitutive Relation A2.1 Introduction A2.2 Material Properties A2.3 Multiple Integral Representation of Initially Isotropic Materials (Relaxation Form) A2.4 The Inverse Relation (Creep Form)Appendix A3. Unit Step Function and Unit Impulse Function A3.1 Unit Step Function or Heaviside Unit Function A3.2 Signum Function A3.3 Unit Impulse or Dirac Delta Function A3.4 Relation Between Unit Step Function and Unit Impulse Function A3.5 Dirac Delta Function or Heaviside Function in Evaluation of IntegralsAppendix A4. Laplace Transformation A4.1 Definition of the Laplace Transformation A4.2 Sufficient Conditions for Existence of Laplace Transforms A4.3 Some Important Properties of Laplace Transforms A4.4 The Inverse Laplace Transform A4.5 Partial Fraction Expansion A4.6 Some Uses of the Laplace TransformAppendix A5. Derivation of the Modified Superposition Principles from the Multiple Integral Representation A5.1 Second Order Term A5.2 Third Order Term A5.3 Application to Third Order Multiple Integrals for CreepAppendix A6. Conversion TablesBibliographySubject IndexAuthor Index

- No. of pages: 380
- Language: English
- Edition: 1
- Volume: 18
- Published: January 1, 1976
- Imprint: North Holland
- eBook ISBN: 9780444601926

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