Fracture and Fatigue of Welded Joints and Structures

The failure of any welded joint is at best inconvenient and at worst can lead to catastrophic accidents. Fracture and fatigue of welded joints and structures analyses the processes and causes of fracture and fatigue, focusing on how the failure of welded joints and structures can be predicted and minimised in the design process.Part one concentrates on analysing fracture of welded joints and structures, with chapters on constraint-based fracture mechanics for predicting joint failure, fracture assessment methods and the use of fracture mechanics in the fatigue analysis of welded joints. In part two, the emphasis shifts to fatigue, and chapters focus on a variety of aspects of fatigue analysis including assessment of local stresses in welded joints, fatigue design rules for welded structures, k-nodes for offshore structures and modelling residual stresses in predicting the service life of structures.With its distinguished editor and international team of contributors, Fracture and fatigue of welded joints and structures is an essential reference for mechanical, structural and welding engineers, as well as those in the academic sector with a research interest in the field.

Autorentext
Kenneth Macdonald is Professor in the Department of Mechanical and Structural Engineering and Materials Science at the University of Stavanger, Norway.

Inhalt

Contributor contact details

Preface

Introduction

Introduction

Linear elastic fracture mechanics

Fatigue

Layout

Part I: Analysing fracture of welded joints and structures

Chapter 1: Constraint-based fracture mechanics in predicting the failure of welded joints

Abstract:

1.1 Introduction to constraint-based elastic-plastic fracture mechanics

1.2 Constraint parameters

1.3 Tabulation of Q-solutions

1.4 Development of a failure assessment diagram (FAD) approach to incorporate constraint

1.5 Effect of weld mismatch on crack tip constraint

1.6 Full field (local approach) analysis for fracture assessment

1.7 Conclusion

Chapter 2: Constraint fracture mechanics: test methods

Abstract:

2.1 Introduction

2.2 High strains

2.3 Two-parameter fracture mechanics

2.4 Development of the single edge notch tension (SENT) test

2.5 Standardising the single edge notch tension (SENT) test

2.6 Conclusions

2.8 Appendix: Codes and standards

2.9 Nomenclature

Chapter 3: Fracture assessment methods for welded structures

Abstract:

3.1 Introduction

3.2 Development of engineering critical assessment (ECA) methods

3.3 The failure assessment diagram (FAD) concept

3.4 Specific engineering critical assessment (ECA) methods: R6

3.5 Specific engineering critical assessment (ECA) methods: BS 7910/PD6493

3.6 Specific engineering critical assessment (ECA) methods: Structural Integrity Procedures for European Industry (SINTAP)/European Fitness- for-service Network (FITNET)

3.7 Specific engineering critical assessment (ECA) methods: American Petroleum Institute (API)/ American Society for Mechanical Enginners (ASME)

3.8 Future trends

Chapter 4: The use of fracture mechanics in the fatigue analysis of welded joints

Abstract:

4.1 Introduction to fracture mechanics

4.2 Technical application of fracture mechanics

4.3 Fatigue assessment of welded joints using fracture mechanics

4.4 Examples of practical application

4.5 Conclusions

Part II: Analysing fatigue of welded joints and structures

Chapter 5: Fatigue strength assessment of local stresses in welded joints

Abstract:

5.1 Introduction

5.2 Types of stress

5.3 Factors affecting the fatigue strength

5.4 Fatigue strength assessment

5.5 Conclusions

Chapter 6: Improving weld class systems in assessing the fatigue life of different welded joint designs

Abstract:

6.1 Introduction

6.2 Historic view

6.3 Weld class system ISO 5817

6.4 Weld class systems at Volvo

6.5 A consistent and objective weld class system

6.6 Discussion

6.7 Conclusions

6.8 Future trends

6.9 Sources of further information and advice

Chapter 7: Fatigue design rules for welded structures

Abstract:

7.1 Introduction

7.2 Key features of welded joints influencing fatigue

7.3 Fatigue crack propagation

7.4 Design rules

7.5 Future developments in the application of fatigue rules

7.6 Conclusions

7.8 Appendix: fatigue design codes and standards

Chapter 8: Fatigue assessment methods for variable amplitude loading of welded structures

Abstract:

8.1 Introduction

8.2 Fatigue damage and assessment for variable amplitude loading

8.3 Variable amplitude fatigue testing

8.4 Future trends

8.5 Source of further information and advice

Chapter 9: Reliability aspects in fatigue design of welded structures using selected local approaches: the example of K-nodes for offshore constructions

Abstract:

9.1 Introduction

9.2 Selected decisive design parameters

9.3 Selected design concepts by the example of K-nodes

9.