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Nomenclature 12

1. 서론 14

1.1. 일반사항 14

1.2. 잠수함 선체 구조 17

2. 강도 계산 이론 동향 20

3. 압력선체 강도 계산 21

3.1. 압력선체 강도계산 절차 21

3.2. 압력선체 외판 및 늑골 응력계산 22

3.2.1. 외판 응력계산 22

3.2.2. 늑골 응력계산 24

3.3. 좌굴 압력 계산 25

3.3.1. 파괴 양식 25

3.3.2. 축대칭 좌굴 27

3.3.3. 비대칭 좌굴 29

3.3.4. 전반적 좌굴 30

3.3.5. 늑골 좌굴 31

4. 해석적 방법에 따른 Case Study 33

4.1. Case Study Data 34

4.2. 제한 조건 36

4.2.1. 축대칭 좌굴 압력 36

4.2.2. 비대칭 좌굴 압력 36

4.2.3. 전반적 좌굴 압력 36

4.2.4. 진원도 허용 값 37

4.2.5. 늑골 좌굴 37

4.3. Case Study 결과 38

4.3.1. 외판 두께 추정식 38

4.3.2. 늑골 간격 추정식 39

4.3.3. 웨브 높이 추정식 40

4.3.4. 웨브 두께 추정식 41

4.3.5. 플랜지 폭 추정식 43

4.3.6. 플랜지 두께 추정식 45

5. 구조 안전성 검증 47

5.1. 구조해석 일반사항 49

5.1.1. 재료 비선형 정보 49

5.1.2. 재료의 기계적 특성 51

5.1.3. 허용 응력 51

5.2. 축대칭 좌굴 52

5.2.1. 적용 요소 52

5.2.2. 해석 조건 52

5.2.3. 모델링 53

5.2.4. 해석 결과 53

5.3. 비대칭 좌굴 59

5.3.1. 적용 요소 59

5.3.2. 해석 조건 59

5.3.3. 모델링 60

5.3.4. 해석 결과 60

6. 중량비교 (기존 추정식 vs. 제시된 추정식) 66

7. 결론 67

참고 문헌 69

붙임 71

붙임 1. Case 별 축대칭 좌굴 강도 해석 결과 71

붙임 2. Case 별 비대칭 좌굴 강도 해석 결과 89

Abstract 107

표목차

Table 1. Case Study Data 34

Table 2. Design Variables Bound 35

Table 3. Principal Dimension for Models 47

Table 4. Shell Yielding Pressure and Shell Buckling Pressure by Analytic Method 48

Table 5. Material Property of HY80, HY100 and HY130 51

Table 6. Shell Yielding Pressure of Each Case 54

Table 7. Comparison of Shell Yielding Pressure (Per_analytical) by Analytic Method... 58

Table 8. Shell Buckling Pressure of Each Case 61

Table 9. Comparison of Shell Buckling Pressure (Per_analytical) by Analytic Method... 65

Table 10. Suggestion of Initial Scantling Formulae 68

그림목차

Figure 1. SCORPENE Class Submarine Structure 18

Figure 2. LOS ANG ELES Class Submarine Structure 18

Figure 3. 214 Class Submarine Structure 19

Figure 4. Shell Yielding 25

Figure 5. Shell Buckling 26

Figure 6. General Instability 26

Figure 7. Pre-Tilt Angle (α˚) of Ring Frame 31

Figure 8. Typical Cylindrical Shell & Cross Section 33

Figure 9. Factor α for a Shell Thickness Initial Scantling 38

Figure 10. Factor β for Frame Space Initial Scantling Formula 39

Figure 11. Ratio Between Shell Thickness(h) and Web Height(hw)[이미지참조] 40

Figure 12. Ratio Between Shell Thickness(h) and Web Thickness(tw)[이미지참조] 41

Figure 13. Ratio Between Shell Thickness(h) and Flange Width(bfl)[이미지참조] 43

Figure 14. Ratio Between Shell Thickness(h) and Flange Thickness(tfl)[이미지참조] 45

Figure 15. HY80 σ-ε Curve 49

Figure 16. HY100 σ-ε Curve 50

Figure 17. HY130 σ-ε Curve 50

Figure 18. Boundary Condition for Shell Yielding 53

Figure 19. Case 1: Shell Yielding Pressure Estimation 55

Figure 20. Case 2: Shell Yielding Pressure Estimation 55

Figure 21. Case 3: Shell Yielding Pressure Estimation 56

Figure 22. Case 4: Shell Yielding Pressure Estimation 56

Figure 23. Case 5: Shell Yielding Pressure Estimation 57

Figure 24. Case 6: Shell Yielding Pressure Estimation 57

Figure 25. Case 7: Shell Yielding Pressure Estimation 58

Figure 26. Boundary Condition for Shell Buckling 60

Figure 27. Case 1: Shell Buckling Pressure Estimation 62

Figure 28. Case 2: Shell Buckling Pressure Estimation 62

Figure 29. Case 3: Shell Buckling Pressure Estimation 63

Figure 30. Case 4: Shell Buckling Pressure Estimation 63

Figure 31. Case 5: Shell Buckling Pressure Estimation 64

Figure 32. Case 6: Shell Buckling Pressure Estimation 64

Figure 33. Case 7: Shell Buckling Pressure Estimation 65

Figure 34. Pressure Hull Weight per Meter Comparison by Existing Formulae and by... 66

Figure 35. Case 1: Shell Yielding Pressure (Initial Imperfection 0.5㎜) 71

Figure 36. Case 1: Shell Yielding Pressure (Initial Imperfection 1.0㎜) 71

Figure 37. Case 1: Shell Yielding Pressure (Initial Imperfection 2.0㎜) 72

Figure 38. Case 1: Shell Yielding Pressure (Initial Imperfection 3.0㎜) 72

Figure 39. Case 1: Shell Yielding Pressure (Initial Imperfection 4.0㎜) 73

Figure 40. Case 2: Shell Yielding Pressure (Initial Imperfection 0.5㎜) 73

Figure 41. Case 2: Shell Yielding Pressure (Initial Imperfection 1.0㎜) 74

Figure 42. Case 2: Shell Yielding Pressure (Initial Imperfection 2.0㎜) 74

Figure 43. Case 2: Shell Yielding Pressure (Initial Imperfection 3.0㎜) 75

Figure 44. Case 2: Shell Yielding Pressure (Initial Imperfection 4.0㎜) 75

Figure 45. Case 3: Shell Yielding Pressure (Initial Imperfection 0.5㎜) 76

Figure 46. Case 3: Shell Yielding Pressure (Initial Imperfection 1.0㎜) 76

Figure 47. Case 3: Shell Yielding Pressure (Initial Imperfection 2.0㎜) 77

Figure 48. Case 3: Shell Yielding Pressure (Initial Imperfection 3.0㎜) 77

Figure 49. Case 3: Shell Yielding Pressure (Initial Imperfection 4.0㎜) 78

Figure 50. Case 4: Shell Yielding Pressure (Initial Imperfection 0.5㎜) 78

Figure 51. Case 4: Shell Yielding Pressure (Initial Imperfection 1.0㎜) 79

Figure 52. Case 4: Shell Yielding Pressure (Initial Imperfection 2.0㎜) 79

Figure 53. Case 4: Shell Yielding Pressure (Initial Imperfection 3.0㎜) 80

Figure 54. Case 4: Shell Yielding Pressure (Initial Imperfection 4.0㎜) 80

Figure 55. Case 5: Shell Yielding Pressure (Initial Imperfection 0.5㎜) 81

Figure 56. Case 5: Shell Yielding Pressure (Initial Imperfection 1.0㎜) 81

Figure 57. Case 5: Shell Yielding Pressure (Initial Imperfection 2.0㎜) 82

Figure 58. Case 5: Shell Yielding Pressure (Initial Imperfection 3.0㎜) 82

Figure 59. Case S: Shell Yielding Pressure (Initial Imperfection 4.0㎜) 83

Figure 60. Case 6: Shell Yielding Pressure (Initial Imperfection 0.5㎜) 83

Figure 61. Case 6: Shell Yielding Pressure (Initial Imperfection 1.0㎜) 84

Figure 62. Case 6: Shell Yielding Pressure (Initial Imperfection 2.0㎜) 84

Figure 63. Case 6: Shell Yielding Pressure (Initial Imperfection 3.0㎜) 85

Figure 64. Case 6: Shell Yielding Pressure (Initial Imperfection 4.0㎜) 85

Figure 65. Case 7: Shell Yielding Pressure (Initial Imperfection 0.5㎜) 86

Figure 66. Case 7: Shell Yielding Pressure (Initial Imperfection 1.0㎜) 86

Figure 67. Case 7: Shell Yielding Pressure (Initial Imperfection 2.0㎜) 87

Figure 68. Case 7: Shell Yielding Pressure (Initial Imperfection 3.0㎜) 87

Figure 69. Case 7: Shell Yielding Pressure (Initial Imperfection 4.0㎜) 88

Figure 70. Case 1: Shell Buckling Pressure (Initial Imperfection 0.5㎜) 89

Figure 71. Case 1: Shell Buckling Pressure (Initial Imperfection 1.0㎜) 89

Figure 72. Case 1: Shell Buckling Pressure (Initial Imperfection 2.0㎜) 90

Figure 73. Case 1: Shell Buckling Pressure (Initial Imperfection 3.0㎜) 90

Figure 74. Case 1: Shell Buckling Pressure (Initial Imperfection 4.0㎜) 91

Figure 75. Case 2: Shell Buckling Pressure (Initial Imperfection 0.5㎜) 91

Figure 76. Case 2: Shell Buckling Pressure (Initial Imperfection 1.0㎜) 92

Figure 77. Case 2: Shell Buckling Pressure (Initial Imperfection 2.0㎜) 92

Figure 78. Case 2: Shell Buckling Pressure (Initial Imperfection 3.0㎜) 93

Figure 79. Case 2: Shell Buckling Pressure (Initial Imperfection 4.0㎜) 93

Figure 80. Case 3: Shell Buckling Pressure (Initial Imperfection 0.5㎜) 94

Figure 81. Case 3: Shell Buckling Pressure (Initial Imperfection 1.0㎜) 94

Figure 82. Case 3: Shell Buckling Pressure (Initial Imperfection 2.0㎜) 95

Figure 83. Case 3: Shell Buckling Pressure (Initial Imperfection 3.0㎜) 95

Figure 84. Case 3: Shell Buckling Pressure (Initial Imperfection 4.0㎜) 96

Figure 85. Case 4: Shell Buckling Pressure (Initial Imperfection 0.5㎜) 96

Figure 86. Case 4: Shell Buckling Pressure (Initial Imperfection 1.0㎜) 97

Figure 87. Case 4: Shell Buckling Pressure (Initial Imperfection 2.0㎜) 97

Figure 88. Case 4: Shell Buckling Pressure (Initial Imperfection 3.0㎜) 98

Figure 89. Case 4: Shell Buckling Pressure (Initial Imperfection 4.0㎜) 98

Figure 90. Case 5: Shell Buckling Pressure (Initial Imperfection 0.5㎜) 99

Figure 91. Case 5: Shell Buckling Pressure (Initial Imperfection 1.0㎜) 99

Figure 92. Case 5: Shell Buckling Pressure (Initial Imperfection 2.0㎜) 100

Figure 93. Case 5: Shell Buckling Pressure (Initial Imperfection 3.0㎜) 100

Figure 94. Case 5: Shell Buckling Pressure (Initial Imperfection 4.0㎜) 101

Figure 95. Case 6: Shell Buckling Pressure (Initial Imperfection 0.5㎜) 101

Figure 96. Case 6: Shell Buckling Pressure (Initial Imperfection 1.0㎜) 102

Figure 97. Case 6: Shell Buckling Pressure (Initial Imperfection 2.0㎜) 102

Figure 98. Case 6: Shell Buckling Pressure (Initial Imperfection 3.0㎜) 103

Figure 99. Case 6: Shell Buckling Pressure (Initial Imperfection 4.0㎜) 103

Figure 100. Case 7: Shell Buckling Pressure (Initial Imperfection 0.5㎜) 104

Figure 101. Case 7: Shell Buckling Pressure (Initial Imperfection 1.0㎜) 104

Figure 102. Case 7: Shell Buckling Pressure (Initial Imperfection 2.0㎜) 105

Figure 103. Case 7: Shell Buckling Pressure (Initial Imperfection 3.0㎜) 105

Figure 104. Case 7: Shell Buckling Pressure (Initial Imperfection 4.0㎜) 106

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