Fatigue and Fracture Mechanics of Offshore Structures

Linus Etube is the author of Fatigue and Fracture Mechanics of Offshore Structures, published by Wiley.

• Series Editor's ForewordAcknowledgementsForeword NotationChapter 1 Literature Review1.1 Introduction and background1.2 Review1.3 Stress analysis of tubular joints1.3.1 Definition of stresses in welded connections1.3.2 Definition of hot spot stress1.3.3 Methods of stress analysis1.4 Fatigue design1.4.1 S-N approach1.4.2 The Fracture Mechanics (FM) approach1.5 SummaryChapter 2 Service Load Simulation of Offshore Structures2.1 Introduction2.2 Fatigue loading in Jack-up structures2.3 Review of previous loading models2.3.1 COLOS/C 12-20 series2.3.2 UKOSRP II double-peaked spectrum2.3.3 Hart/Wischung algorithm2.3.4 WASH sequence2.4 The JOSH model2.5 Generation of JOSH2.5.1 The pseudo random binary sequence technique2.5.2 The Morkov chain technique2.6 Jack-up dynamic response2.6.1 The transfer function approach2.6.2 Modelling of structural parameters2.6.3 Modelling of soil-structure interaction2.7 Modelling of wave loading2.8 Selection of sea states2.9 Discussion2.10 SummaryChapter 3 Large-scale Fatigue Testing3.1 Introduction3.2 Test specimen consideration3.2.1 Properties of SE 7023.2.2 consideration of test specimen geometry3.2.3 Fabrication of SE 702 specimens3.3 Experimental set-up3.3.1 Details of test rig3.3.2 Test control and data acquisition3.3.4 Simulation of environmental conditions3.4 Stress analysis of Y joints3.4.1 Experimental stress and analysis procedure3.4.2 Use of parametric equations3.5 Experimental fatigue testing3.5.1 Test parameters and the JOSH sequence3.6 Fatigue test results3.6.1 Fatigue crack initiation3.6.2 Crack growth curves3.6.3 Crack aspect ratio evolution3.6.4 S-N data3.7 Discussion3.8 SummaryChapter 4 Fracture Mechanics Analysis of Results4.1 Introduction4.2 The stress intensity factor concept4.3 Experimental results4.4 Use of empirical SIF solutions4.4.1 The average stress model4.4.2 The two phase model (TPM)4.4.3 The modified average stress model4.5 Adapted plate solutions4.5.1 Newman-Raju SIF solution for surface cracks4.6 New semi-empirical Y factor solution4.7 Variable amplitude crack growth models4.7.1 Equivalent stress range approach4.7.2 Equivalent crack growth concept4.8 Consideration of sequence effects4.9 Fast assessment of offshore structures4.9.1 New normalised PSD equation4.10 Sea state probability model4.10.1 Use of sea state probability distribution model4.10.2 Formulation of the sea state equivalent stress concept4.11 Discussion4.12 SummaryChapter 5 Conclusion5.1 Summary of book5.2 Conclusions and recommendationsReferencesIndex