In five chapters, this volume presents recent developments in fatigue assessment. In the first chapter, a generalized Neuber concept of fictitious notch rounding is presented where the microstructural support factors depend on the notch opening angle besides the loading mode. The second chapter specifies the notch stress factor including the strain energy density and J-integral concept while the SED approach is applied to common fillet welded joints and to thin-sheet lap welded joints in the third chapter. The forth chapter analyses elastic-plastic deformations in the near crack tip zone and discusses driving force parameters. The last chapter discusses thermomechanical fatigue, stress, and strain ranges.

1 Generalised Neuber Concept of Fictitious Notch Rounding 1

1.1 Survey of Chapter Contents 2

1.2 Fictitious Notch Rounding for Tensile Loading 4

1.3 Fictitious Notch Rounding for Out-of-Plane Shear Loadi ng 28

1.4 Fictitiou s Notch Rounding for In-Plane Shear Loadi ng 39

1.5 Application-Relevant Issues of the Fictitious Notch Rounding Concept 69

References 98

2 Extended Stress Intensity Factor Concepts 101

2.1 Survey of Chapter Contents 103

2.2 Original Stress Intensity Factor Concept 104

2.3 Notch Stress Intensity Factor Concept 130

2.4 Generalised Notch Stress Intensity Factor Concept 156

2.5 Plastic Notch Stress Intensity Factor Concept 199

2.6 Stress Intensity Factor Concept for Rigid Inclusions 242

References 257

3 Local Strain Energy Density Concept 267

3.1 Su rvey of Chapter Contents 268

3.2 Poi nted Notch SED Concept 269

3.3 Multiaxial Loadi ng SEO Concept 292

3.4 Blunt Notch SEO Concept 301

3.5 Relation of the Local SED Concept to Comparable Concepts 310

3.6 Special Issues of lhe SEO Concept 331

3.7 Coarse Mesh Options 365

3.8 Conclusions from Chapter Contents 380

References 385

4 Elastic-Plas Fatigue Crack Growth 391

4.1 Survey of Chapter Contents 392

4.2 Crack Growth under Small-Scale Yielding Conditions 392

4.3 Crack Growth under Large-Scale Yielding Conditions 434

References 471

Index 483

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