| ABSTRACT | 第6-7页 |
| 摘要 | 第8-15页 |
| Nomenclature | 第15-17页 |
| CHAPTER 1 INTRODUCTION AND LITERATURE REVIEW | 第17-35页 |
| 1.1 Acoustic Emission and its Applications | 第17-24页 |
| 1.1.1 Acoustic emission | 第17-19页 |
| 1.1.2 Location of acoustic emission sources | 第19-20页 |
| 1.1.3 Acoustic emission source characterization | 第20-23页 |
| 1.1.4 Acoustic emission during fatigue crack growth | 第23-24页 |
| 1.2 AE application in fracture mechanics | 第24-26页 |
| 1.2.1 Crack initiation | 第24页 |
| 1.2.2 Crack propagation | 第24-25页 |
| 1.2.3 Fatigue life prediction | 第25-26页 |
| 1.3 Quantitative acoustic emission | 第26-27页 |
| 1.3.1 Wavelet packet theory | 第26-27页 |
| 1.4 Digital imaging correlation and its application | 第27-33页 |
| 1.4.1 Digital imaging correlation | 第27-31页 |
| 1.4.2 Application of DIC in fracture mechanics | 第31-33页 |
| 1.5 Fatigue fracture mechanics in welded structures | 第33-34页 |
| 1.6 Outline of the dissertation | 第34-35页 |
| CHAPTER 2 CRACK INITIATION BEHAVIOR IN WELDED STRUCTURES | 第35-51页 |
| 2.1 Experimental details for crack initiation | 第35-40页 |
| 2.1.1 Specimens design | 第35-36页 |
| 2.1.2 Experimental methods | 第36-37页 |
| 2.1.3 Acoustic emission equipment and instrumentation | 第37-39页 |
| 2.1.4 Acquiring Calibration Images | 第39-40页 |
| 2.1.5 Source of errors during DIC measurement | 第40页 |
| 2.2 Finite element analysis | 第40-42页 |
| 2.3 Theoretical model for crack initiation | 第42-44页 |
| 2.3.1 A Continuum mechanics fatigue damage initiation | 第42-44页 |
| 2.4 Results and discussions | 第44-49页 |
| 2.4.1 Wavelet packet analysis | 第44-47页 |
| 2.4.2 Finite element analysis | 第47-49页 |
| 2.5 Conclusion | 第49-51页 |
| CHAPTER 3 FATIGUE CRACK PROPAGATION BEHAVIOR IN WELDEDCONNECTIONS | 第51-67页 |
| 3.1 Experimental details | 第51-52页 |
| 3.1.1 Specimen design | 第51-52页 |
| 3.1.2 Experimental set up for fatigue crack propagation | 第52页 |
| 3.2 Theoretical models for crack propagation | 第52-56页 |
| 3.2.1 Continuum damage mechanics model | 第52-53页 |
| 3.2.2 Linear elastic fracture mechanics model | 第53-55页 |
| 3.2.3 Acoustic emission model | 第55-56页 |
| 3.3 Results and discussion | 第56-65页 |
| 3.3.1 Critical fatigue levels | 第56-59页 |
| 3.3.2 Digital imaging correlation for fatigue crack propagation | 第59-62页 |
| 3.3.3 Crack growth rate | 第62-63页 |
| 3.3.4 Crack extension estimation | 第63-65页 |
| 3.4 Conclusion | 第65-67页 |
| CHAPTER 4 FATIGUE DAMAGE CHARACTERIZATION AND LIFEPREDICTION IN WELDED STRUCTURES | 第67-78页 |
| 4.1 Acoustic emission characterization of fatigue crack | 第67-70页 |
| 4.1.1 Acoustic emission during fatigue crack propagation | 第67-68页 |
| 4.1.2 Effect of peak loads on crack growth | 第68-70页 |
| 4.2 Determination of fatigue crack propagation rate (CPR) | 第70-73页 |
| 4.3 Basic principles of fatigue life prediction | 第73-76页 |
| 4.4 Prediction of crack extension from acoustic emissions | 第76-77页 |
| 4.5 Conclusion | 第77-78页 |
| CHAPTER 5 MICROSCOPIC CRACK INITIATION CONDITION | 第78-87页 |
| 5.1 Experimental details | 第79-80页 |
| 5.2 AE Detection of crack initiation | 第80-82页 |
| 5.3 Digital microscope for surface crack | 第82-84页 |
| 5.4 Digital Imaging Correlation for Microscopic Initiation | 第84-85页 |
| 5.5 Comparison of surface crack and internal cracks | 第85-86页 |
| 5.6 Conclusion | 第86-87页 |
| CHAPTER 6 GENERAL CONCLUSIONS AND RECOMMENDATIONS | 第87-89页 |
| 6.1 Conclusion | 第87-88页 |
| 6.2 Future work and recommendation | 第88-89页 |
| REFERENCE | 第89-94页 |
| ACADEMIC PAPERS PUBLISHED/UNDER REVIEW | 第94页 |
