Analyses of Welded Structures: Flaws
Reference To Fatigue Life Predictions and Damage Tolerance of Welded
By Tom Lassen, Naman Recho
to the Fatigue Life of Welded Joints
or controlling fatigue damage is a major issue in the design and
inspection of welded structures subjected to dynamic loading. Life
predictions are usually used for safe life analysis, i.e. for
verifying that it is very unlikely that fatigue damage will occur
during the target service life of a structure.
Damage tolerance analysis is used for
predicting the behavior of a fatigue crack and for planning of
in-service scheduled inspections. It should be a high probability
that any cracks appearing are detected and repaired before they
become critical. In both safe life analysis and the damage
tolerance analysis there may be large uncertainties involved that
have to be treated in a logical and consistent manner by stochastic
This book focuses on fatigue life predictions
and damage tolerance analysis of welded joints and is divided into
three parts. The first part outlines the common practice used for
safe life and damage tolerance analysis with reference to rules and
regulations. The second part emphasizes stochastic modeling and
decision-making under uncertainty, while the final part is devoted
to recent advances within fatigue research on welded joints.
Industrial examples that are included are
mainly dealing with offshore steel structures. Spreadsheets which
accompany the book give the reader the possibility for hands-on
experience of fatigue life predictions, crack growth analysis and
inspection planning. As such, these different areas will be of use
to engineers and researchers.
About The Authors:
Tom Lassen is from Agder University College in Grimstad,
Norway. He also teaches aircraft maintenance for the Norwegian Royal
Air Force and has recently been a visiting Professor at University
Blaise Pascal, Clermont-Ferrand, France.
Naman Recho has worked extensively with conceptual and
applied aspects of fracture mechanics, with welded offshore
structures and reliability analysis of cracked structures. He also
teaches at Centre des Hautes Etudes de la Construction, Paris, and
is guest Professor at Hefei University of Technology in China
Table of Contents:
Part I. Common Practice.
Chapter 1. Introduction.
Chapter 2. Basic characterization of the fatigue behavior of
Chapter 3. Experimental methods and data analysis.
Chapter 4. Definition and description of fatigue loading.
Chapter 5. The S-N approach.
Chapter 6. Applied fracture mechanics.
Chapter 7. Stochastic modeling.
Chapter 8. Proposal for a new type of S-N curve.
Chapter 9. Physical modeling of the entire fatigue process.
Chapter 10. A notch stress field approach to the prediction of
Chapter 11. Multi-axial fatigue of welded joints.
Chapter 12. The effect of overloads on the fatigue life.
Appendix A. Short Overview of the foundations of Fracture
Appendix B. Spreadsheet for Fatigue Life Estimates.
Appendix C. CG - Crack Growth Based on Fracture Mechanics.
Appendix D. CI - Crack Initiation Based on Coffin-Manson.