Fitness-for-Service Fracture Assessment of Structures Containing Cracks

A Workbook based on the European SINTAP/FITNET procedure


  • Uwe Zerbst, Bundesanstalt für Materialforschung und Prüfung (BAM), Berlin, Germany
  • Manfred Schödel, ALSTOM Baden
  • Stephen Webster, CORUS RD&T, UK
  • Robert Ainsworth, British Energy Generation Limited, Gloucester, UK

The purpose of this book is to facilitate the use of fracture mechanics based failure assessment procedures for the evaluation and design of structures and components. All practical structures contain flaws and the optimum combination of cost efficiency and safety whilst achieving the required capability, can only be realised by using state of the art methods such as that represented by the European flaw assessment method SINTAP/FITNET to analyse the safety risk. This book is written by practitioners with extensive experience in both the development and use of integrity assessment methods and provides comprehensive information on the basic principles and use of analytical flaw assessment. It provides an introduction to the method, its background, how it can be applied, its potential and, importantly, its limitations. The explanations are complimented by using a large number of worked examples and validation exercises which illustrate all aspects of the procedure. In addition, for students and engineers who are new to the subject, a comprehensive glossary of basic terms used in fracture mechanics based integrity evaluations is included. The topics addressed include: - Crack driving force (CDF) and failure assessment diagram (FAD) type analyses- Preparation of the input parameters (crack dimensions, stress-strain properties, fracture toughness, statistical aspects)- Determination of the model parameters, (stress intensity factor and yield load solutions)- Treatment of combined primary and secondary loading, together with residual stress effects- Analysis of the effect of constraint effects (treatment of small defects and section size effects)- Treatment of mixed mode loading- Consideration of the influences of strength mismatch- Reliability aspects
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University researchers (materials, engineering, mechanics). Researchers in interdisciplinary areas of structural integrity, damage tolerance, failure analysis, NDT. Practitioners in industry such as energy supply, aerospace, chemistry, petrochemicals, pipelines, offshore structures, railways.


Book information

  • Published: September 2007
  • ISBN: 978-0-08-044947-0


"The comprehensiveness of the compilation of the SINTAP/FITNET Procedure in this book, clear outline, worked examples, numerous formulas for important relationships, clear illustrations, an illustrated glossary, a comprehensive subject index: the level of presentation of all these items is excellent and may animate the reader to spend more time on the book than he may have had in mind before he started. This book is written by key experts in the field and is highly recommendable to a wide readership, in particular those engineers who want to be made aware of the latest state of the art of structural assessment." -- Dr. Karl-Heinz Schwalbe, Consultant, Germany

The authors should be commended for making a very useful contribution to the area of fracture assessment of metallic structures. The book comprises a good mix of theory and practical procedures, which are complimented by many worked examples and validation exercises." -- Dr Xiang Zhang, Cranfield University, U.K.

"...a very well written, articulate and informative presentation of the European flaw assessment method SINTAP/FITNET... The explanations are complemented by extensive and detailed worked examples and validation exercises illustrating the use of the procedure. This is a very welcome aspect of the book, since frequently the scientific and technical literature provides insufficient help to those wishing to apply the results presented. In summary, this book is an important contribution to the field of structural integrity, failure prevention and assessment, of great value to engineers and scientists working in a wide variety of sectors where metallic structures are used." -- Professor P.M.S.T. de Castro, Universidade do Porto, Portugal

Table of Contents

1. INTRODUCTION1.1 SINTAP1.2 FITNET1.3 The Topic of the Present Book2. BRIEF OVERVIEW ON THE DEVELOPMENT OF FLAW ASSESSMENT 2.1 General Aspects2.2 Ligament yielding 2.3 The TWI Design Curve Approach2.4 The Early FAD Approach of CEGB2.5 The EPRI Approach2.6 The Reference Stress Method of CEGB2.7 The R6-Revision 3 Approach of CEGB2.8 The ETM Approach of GKSS2.9 The SINTAP Approach3. BASIC FEATURES OF SINTAP/FITNET3.1 Fitness-for-Service3.2 Potential Tasks of a SINTAP/FITNET Analysis3.3 Multi-Optional Concept3.4 FAD Versus CDF Analyses3.5 Integrated Concept4. THE INPUT PARAMETERS4.1 Loading Input Parameters 4.2 Flaw Characterisation 4.3 Deformation Characteristics of the Material4.4 Toughness Characteristics of the Material5. THE MODEL PARAMETERS 5.1 The Stress Intensity Factor (K Factor)5.2 Net Section Yield Load FY, Reference Stress and Ligament Yielding6. STRUCTURAL ASSESSMENT 6.1 Acceptable or Critical Conditions of a Component6.2 Assessment Based on the FAD Philosophy6.3 Assessment Based on the CDF Philosophy 6.4 The f(Lr) Function According to the Different Analysis Levels6.5 Examples of SINTAP/FITNET Analyses6.6. Combined Primary and Secondary Stresses6.7 Constraint Effects6.8 Mixed Mode Loading6.9 Rapid Loading and crack arrest6.10 Thin Wall Structures6.11 Strength Mismatch6.12 Weld shape imperfections 6.13 Reliability Aspects and Significance of the Results6.14 Potential Benefit of Applying Advanced Options and Modules7. VALIDATION EXAMPLES8. REFERENCES9. APPENDIX: Fracture Toughness Test Standards10. GLOSSARY