표제지
요약
ABSTRACT
목차
제1장 서론 14
1.1. 연구배경 14
제2장 피로평가 절차 16
제3장 국부 빙하중 18
3.1. 직접 해석법 (Direct Analysis) 18
3.1.1. 얼음의 모델링 19
3.2. 간이해석법 (Simplified Analysis) 29
3.2.1. 국부 빙하중 진폭의 확률모델 29
3.3. 반 해석적 방법 (Semi Analytic Method) 35
3.3.1. 해석순서 35
3.3.2. 국부 압괴 36
3.3.3. 파괴모드 39
제4장 피로대상 위치의 응력 42
4.1. Method 1 : 빙하중 시계열 - 응력 확률분포 42
4.3. Method 2 : 빙하중 확률분포-응력의 확률분포 44
제5장 피로손상도 46
제6장 방법론에 따른 결과 49
6.1. 해석 조건 49
6.1.1. 유한요소 모델 49
6.1.2. 피로 대상 위치 52
6.1.3. 유효 얼음 길이 53
6.2. 빙하중 확률분포 55
6.3. 피로손상도 57
제7장 결론 64
참고문헌 66
Table 1. Fatigue damage of different probability distribution 47
Table 2. Dimensions of the structure 50
Table 3. Material properties of the ice 50
Table 4. Velocity-thickness cases 51
Table 5. Influence factor on each panel 52
Table 6. S-N parameters for air or with cathodic protection 57
Table 7. Fatigue damage results-direct analysis 59
Table 8. Fatigue damage results - simplified analysis 61
Table 9. Fatigue results for each condition - semi analytic method 63
Fig 1. Flow charts for the fatigue assessment 17
Fig 2. Crack Propagation 18
Fig 3. Fracture patterns of level ice 19
Fig 4. Mechanical behavior of the ice 20
Fig 5. Damage initiation and evolution 21
Fig 6. Local crushing on with cases 23
Fig 7. Penetration - Pressure curve 24
Fig 8. Finite element model of level ice 25
Fig 9. Ice rubble pile-up against a sloping structure (ISO 19906) 26
Fig 10. Ice rubble with contact condition 27
Fig 11. Basic model of level ice collide 28
Fig 12. Rubble deletion model 28
Fig 13. Global ice load with rubble 28
Fig 14. Global ice load of breaking force 28
Fig 15. Local ice load with rubble 29
Fig 16. Local ice load of breaking force 29
Fig 17. Ice action on a sloping structure (ISO 19906) 30
Fig 18. Ice load peaks 33
Fig 19. Flowchart of semi analytic method 36
Fig 20. Intersection area of the ship and ice sheet 37
Fig 21. Single contact on the multiple panels 39
Fig 22. Visualization of the semi analytic simulation 41
Fig 23. Breaking ice load - semi analytic method 41
Fig 24. Relation between external force and stress 43
Fig 25. FE model of Semi submergible drilling rig 49
Fig 26. Ice belt zone 49
Fig 27. Scale parameters for each ice length 54
Fig 28. Shape parameters 54
Fig 29. Mean of the local ice load peak 55
Fig 30. Case1 , Panel 1 56
Fig 31. Case 1 , Panel 2 56
Fig 32. Case 3 , Panel 1 56
Fig 33. Case 3 , Panel 2 56
Fig 34. Case 5 , Panel 1 56
Fig 35. Case 5 , Panel 2 56
Fig 36. Fatigue damage for unit distance 58
Fig 37. Fatigue Damage after interpolation 58
Fig 38. Fatigue damage for each ice condition 58
Fig 39. Fatigue damage for unit distance 60
Fig 40. Fatigue damage for each ice conditions 60
Fig 41. Fatigue damage between interpolation 62
Fig 42. Fatigue damage after interpolation 62
Fig 43. Fatigue damage for each condition 62