Fracture and Fatigue of Welded Joints and Structures

ISBN-13: 9780081017029 / Angielski / Miękka / 2016 / 360 str.

Kenneth A. MacDonald; K. MacDonald

Opis

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.

• Analyses the processes and causes of fracture and fatigue, focusing predicting and minimising the failure of welded joints in the design process
• Assesses the fracture of welded joints and structure featuring constraint-based fracture mechanics for predicting joint failure
• Explores specific considerations in fatigue analysis including the assessment of local stresses in welded joints and fatigue design rules for welded structures

Recenzje

"This book is a timely addition to the body of literature on the subject and will be of undoubted value to both researchers and practitioners as a reference of current thinking." --Materials World

Spis treści

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

9.4 Conclusions

Chapter 10: Assessing residual stresses in predicting the service life of welded structures

Abstract:

10.1 Introduction

10.2 Origins and types of stress

10.3 Modification of stresses after welding

10.4 Measurement

10.5 Conclusions

10.6 Acknowledgements

Chapter 11: Fatigue strength improvement methods

Abstract:

11.1 Introduction

11.2 Fatigue strength of welded joints

11.3 Increasing the fatigue strength by improved design

11.4 Improvements obtained by special plate material, filler materials or welding methods

11.5 Special welding methods

11.6 Post-weld improvement methods

11.7 Future trends

11.8 Conclusions

Index

O autorze

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