Acknowledgements i
Abstract iii
Table of contents vi
List of figures x
List of tables xvii
List of symbols xix
CHAPTER I: INTRODUCTION 1
1.1 Motivation 1
1.2 Objectives 2
1.3 Literature review 3
1.3.1 Analysis of underwater explosion 3
1.3.2 Material testing and test piece production 8
1.3.3 Research on fatigue life of pressure hull 10
1.3.4 Research on thermal fatigue life 16
1.4 Thesis layout 18
CHAPTER Ⅱ: RESEARCH METHOD AND ANALYSIS PROCESS 21
2.1 Analysis of an underwater explosion 21
2.1.1 Underwater explosion (UNDEX) phenomenon 21
2.1.2 Acoustic-structure coupling method (ASC) 22
2.1.3 Hull shock factor (HSF) 25
2.1.4 Underwater explosion shock loading 25
2.2 Fatigue life analysis of the pressure hull of the submersible vehicle 26
2.2.1 Theoretical basis of fatigue life calculation 28
2.2.2 Fatigue life estimation method 34
2.2.3 Fatigue criterion 37
2.3 Thermal fatigue theory 39
CHAPTER Ⅲ: NUMERICAL ANALYSIS VERIFICATION 50
3.1 Introduction 50
3.2 Underwater explosion verification analysis 50
3.2.1 The underwater explosion experiment 50
3.2.2 Experimental results of the underwater explosion 52
3.2.3 The underwater explosion numerical simulation 53
3.2.4 Results and discussions 54
3.3 Finite element method mesh convergence analysis 56
3.3.1 Analysis of the convergence between the ship’s stiffeners 56
3.3.2 Analysis of the convergence of the mesh in the hole zone 57
3.3.3 Results and discussions 58
3.4 FE-510 and 316L fatigue numerical verification analysis 59
3.4.1 Experiment equipment 60
3.4.2 FE-510 fatigue test and numerical analysis verification 61
3.4.3 316L material test and numerical simulation verification 64
CHAPTER IV: SIMULATION ANALYSIS OF THE PRESSURE HULL OF THE SUBMERSIBLE VEHICLE SUBJECTED TO UNDERWATER EXPLOSION AND FATIGUE LIFE 110
4.1 Introduction 110
4.2 Analysis scenario of the underwater explosion 110
4.2.1 Geometric model 110
4.2.2 Explosives and water area 112
4.2.3 Material parameters and finite element model 112
4.2.4 Shock loading 113
4.2.5 Boundary conditions 114
4.3 Analysis scenario of the fatigue life 115
4.3.1 Material parameters and finite element model 115
4.3.2 Load conditions 115
4.3.3 Boundary conditions 115
4.4 Results and discussion 115
4.4.1 Analysis of underwater explosion results 115
4.4.2 Analysis of fatigue life results 116
CHAPTER Ⅴ: INFLUENCE OF THERMAL EFFECT ON FATIGUE LIFE OF A SUBMERSIBLE VEHICLE 131
5.1 Introduction 131
5.2 Analysis scenario 131
5.3 Finite element model and material parameters 132
5.4 Loading conditions 133
5.4.1 Only hydrostatic pressure cycle load: Case 1.1 and Case 2.1 133
5.4.2 Considering hydrostatic pressure and thermal cycle load: Case 2.1 and Case 2.2 133
5.5 Boundary condition 134
5.6 Fatigue criterion 134
5.7 Results and discussion 134
5.7.1 Stress analysis of the pressure hull of the underwater vehicle 134
5.7.2 Thermal fatigue life analysis of the pressure hull of the underwater vehicle 136
CHAPTER Ⅵ: CONCLUSIONS AND FUTURE WORK 157
6.1 Conclusions 157
6.2 Future work 158
REFERENCE 159

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