Mechanical Properties of Ceramics, 2nd Edition

Preface.

Acknowledgments.

1 Stress and Strain.

1.1 Introduction.

1.2 Tensor Notation for Stress.

1.3 Stress in Rotated Coordinate System.

1.4 Principal Stress.

1.4.1 Principal Stresses in Three Dimensions.

1.5 Stress Invariants.

1.6 Stress Deviator.

1.7 Strain.

1.8 True Stress and True Strain.

1.8.1 True Strain.

1.8.2 True Stress.

Problems.

2 Types of Mechanical Behavior.

2.1 Introduction.

2.2 Elasticity and Brittle Fracture.

2.3 Permanent Deformation.

3 Elasticity.

3.1 Introduction.

3.2 Elasticity of Isotropic Bodies.

3.3 Reduced Notation for Stresses, Strains, and Elastic Constants.

3.4 Effect of Symmetry on Elastic Constants.

3.5 Orientation Dependence of Elastic Moduli in Single Crystals and Composites.

3.6 Values of Polycrystalline Moduli in Terms of Single–Crystal Constants.

3.7 Variation of Elastic Constants with Lattice Parameter.

3.8 Variation of Elastic Constants with Temperature.

3.9 Elastic Properties of Porous Ceramics.

3.10 Stored Elastic Energy.

Problems.

4 Strength of Defect-Free Solids.

4.1 Introduction.

4.2 Theoretical Strength in Tension.

4.3 Theoretical Strength in Shear.

Problems.

5 Linear Elastic Fracture Mechanics.

5.1 Introduction.

5.2 Stress Concentrations.

5.3 Griffith Theory of Fracture of a Brittle Solid.

5.4 Stress at Crack Tip: An Estimate.

5.5 Crack Shape in Brittle Solids.

5.6 Irwin Formulation of Fracture Mechanics: Stress Intensity Factor.

5.7 Irwin Formulation of Fracture Mechanics: Energy Release Rate.

5.8 Some Useful Stress Intensity Factors.

5.9 The J Integral.

5.10 Cracks with Internal Loading.

5.11 Failure under Multiaxial Stress.

Problems.

6 Measurements of Elasticity, Strength, and Fracture Toughness.

6.1 Introduction.

6.2 Tensile Tests.

6.3 Flexure Tests.

6.4 Double-Cantilever-Beam Test.

6.5 Double-Torsion Test.

6.6 Indentation Test.

6.7 Biaxial Flexure Testing.

6.8 Elastic Constant Determination Using Vibrational and Ultrasonic Methods.

Problems.

7 Statistical Treatment of Strength.

7.1 Introduction.

7.2 Statistical Distributions.

7.3 Strength Distribution Functions.

7.4 Weakest Link Theory.

7.5 Determining Weibull Parameters.

7.6 Effect of Specimen Size.

7.7 Adaptation to Bend Testing.

7.8 Safety Factors.

7.9 Example of Safe Stress Calculation.

7.10 Proof Testing.

7.11 Use of Pooled Fracture Data in Linear Regression Determination of Weibull Parameters.

7.12 Method of Maximum Likelihood in Weibull Parameter Estimation.

7.13 Statistics of Failure under Multiaxial Stress.

7.14 Effects of Slow Crack Propagation and R-Curve Behavior on Statistical Distributions of Strength.

7.15 Surface Flaw Distributions and Multiple Flaw Distributions.

Problems.

8 Subcritical Crack Propagation.

8.1 Introduction.

8.2 Observed Subcritical Crack Propagation.

8.3 Crack Velocity Theory and Molecular Mechanism.

8.4 Time to Failure under Constant Stress.

8.5 Failure under Constant Stress Rate.

8.6 Comparison of Times to Failure under Constant Stress and Constant Stress Rate.

8.7 Relation of Weibull Statistical Parameters with and without Subcritical Crack Growth.

8.8 Construction of Strength–Probability–Time Diagrams.

8.9 Proof Testing to Guarantee Minimum Life.

8.10 Subcritical Crack Growth and Failure from Flaws Originating from Residual Stress Concentrations.

8.11 Slow Crack Propagation at High Temperature.

Problems.

9 Stable Crack Propagation and R-Curve Behavior.

9.1 Introduction.

9.2 R-Curve (T-Curve) Concept.

9.3 R-Curve Effects of Strength Distributions.

9.4 Effect of R Curve on Subcritical Crack Growth.

Problems.

10 Overview of Toughening Mechanisms in Ceramics.

10.1 Introduction.

10.2 Toughening by Crack Deflection.

10.3 Toughening by Crack Bowing.

10.4 General Remarks on Crack Tip Shielding.

11 Effect of Microstructure on Toughness and Strength.

11.1 Introduction.

11.2 Fracture Modes in Polycrystalline Ceramics.

11.3 Crystalline Anisotropy in Polycrystalline Ceramics.

11.4 Effect of Grain Size on Toughness.

11.5 Natural Flaws in Polycrystalline Ceramics.

11.6 Effect of Grain Size on Fracture Strength.

11.7 Effect of Second-Phase Particles on Fracture Strength.

11.8 Relationship between Strength and Toughness.

11.9 Effect of Porosity on Toughness and Strength.

11.10 Fracture of Traditional Ceramics.

Problems.

12 Toughening by Transformation.

12.1 Introduction.

12.2 Basic Facts of Transformation Toughening.

12.3 Theory of Transformation Toughening.

12.4 Shear-Dilatant Transformation Theory.

12.5 Grain-Size-Dependent Transformation Behavior.

12.6 Application of Theory to Ca-Stabilized Zirconia.

Problems.

13 Mechanical Properties of Continuous-Fiber-Reinforced Ceramic Matrix Composites.

13.1 Introduction.

13.2 Elastic Behavior of Composites.

13.3 Fracture Behavior of Composites with Continuous, Aligned Fibers.

13.4 Complete Matrix Cracking of Composites with Continuous, Aligned Fibers.

13.5 Propagation of Short, Fully Bridged Cracks.

13.6 Propagation of Partially Bridged Cracks.

13.7 Additional Treatment of Crack-Bridging Effects.

13.8 Additional Statistical Treatments.

13.9 Summary of Fiber-Toughening Mechanisms.

13.10 Other Failure Mechanisms in Continuous, Aligned-Fiber Composites.

13.11 Tensile Stress–Strain Curve of Continuous, Aligned-Fiber Composites.

13.12 Laminated Composites.

Problems.

14 Mechanical Properties of Whisker-, Ligament-, and Platelet-Reinforced Ceramic Matrix Composites.

14.1 Introduction.

14.2 Model for Whisker Toughening.

14.3 Combined Toughening Mechanisms in Whisker-Reinforced Composites.

14.4 Ligament-Reinforced Ceramic Matrix Composites.

14.5 Platelet-Reinforced Ceramic Matrix Composites.

Problems.

15 Cyclic Fatigue of Ceramics.

15.1 Introduction.

15.2 Cyclic Fatigue of Metals.

15.3 Cyclic Fatigue of Ceramics.

15.4 Mechanisms of Cyclic Fatigue of Ceramics.

15.5 Cyclic Fatigue by Degradation of Crack Bridges.

15.6 Short-Crack Fatigue of Ceramics.

15.7 Implications of Cyclic Fatigue in Design of Ceramics.

Problems.

16 Thermal Stress and Thermal Shock in Ceramics.

16.1 Introduction.

16.2 Magnitude of Thermal Stresses.

16.3 Figure of Merit for Various Thermal Stress Conditions.

16.4 Crack Propagation under Thermal Stress.

Problems.

17 Fractography.

17.1 Introduction.

17.2 Qualitative Features of Fracture Surfaces.

17.3 Quantitative Fractography.

17.4 Fractal Concepts in Fractography.

17.5 Fractography of Single Crystals and Polycrystals.

Problems.

18 Dislocations and Plastic Deformation in Ductile Crystals.

18.1 Introduction.

18.2 Definition of Dislocations.

18.3 Glide and Climb of Dislocations.

18.4 Force on a Dislocation.

18.5 Stress Field and Energy of a Dislocation.

18.6 Force Required to Move a Dislocation.

18.7 Line Tension of a Dislocation.

18.8 Dislocation Multiplication.

18.9 Forces between Dislocations.

18.10 Dislocation Pileups.

18.11 Orowan’s Equation for Strain Rate.

18.12 Dislocation Velocity.

18.13 Hardening by Solid Solution and Precipitation.

18.14 Slip Systems.

18.15 Partial Dislocations.

18.16 Deformation Twinning.

Problems.

19 Dislocations and Plastic Deformation in Ceramics.

19.1 Introduction.

19.2 Slip Systems in Ceramics.

19.3 Independent Slip Systems.

19.4 Plastic Deformation in Single-Crystal Alumina.

19.5 Twinning in Aluminum Oxide.

19.6 Plastic Deformation of Single-Crystal Magnesium Oxide.

19.7 Plastic Deformation of Single-Crystal Cubic Zirconia.

Problems.

20 Creep in Ceramics.

20.1 Introduction.

20.2 Nabarro–Herring Creep.

20.3 Combined Diffusional Creep Mechanisms.

20.4 Power Law Creep.

20.5 Combined Diffusional and Power Law Creep.

20.6 Role of Grain Boundaries in High-Temperature Deformation and Failure.

20.7 Damage-Enhanced Creep.

20.8 Superplasticity.

20.9 Deformation Mechanism Maps.

Problems.

21 Creep Rupture at High Temperatures and Safe Life Design.

21.1 Introduction.

21.2 General Process of Creep Damage and Failure in Ceramics.

21.3 Monkman–Grant Technique of Life Prediction.

21.4 Two-Stage Strain Projection Technique.

21.5 Fracture Mechanism Maps.

Problems.

22 Hardness and Wear.

22.1 Introduction.

22.2 Spherical Indenters versus Sharp Indenters.

22.3 Methods of Hardness Measurement.

22.4 Deformation around Indentation.

22.5 Cracking around Indentation.

22.6 Indentation Size Effect.

22.7 Wear Resistance.

Problems.

23 Mechanical Properties of Glass and Glass Ceramics.

23.1 Introduction.

23.2 Typical Inorganic Glasses.

23.3 Viscosity of Glass.

23.4 Elasticity of Inorganic Glasses.

23.5 Strength and Fracture Surface Energy of Inorganic Glasses.

23.6 Achieving High Strength in Bulk Glasses.

23.7 Glass Ceramics.

Problems.

24 Mechanical Properties of Polycrystalline Ceramics in General and Design Considerations.

24.1 Introduction.

24.2 Mechanical Properties of Polycrystalline Ceramics in General.

24.3 Design Involving Mechanical Properties.

References.

Index.