표제지
목차
ABSTRACT 11
I. 서론 12
1.1. 연구 배경 12
1.2. 연구 목적 및 범위 14
II. 실험 방법 15
2.1. 시편 제작 15
2.1.1. 섬유방향 인장시험 시편 제작 16
2.1.2. 기지방향 인장시험 시편 제작 21
2.1.3. 전단시험 시편 제작 25
2.2. 시험 장치 및 조건 28
2.2.1. 염수 환경 28
2.2.2. 인장시험 장치 29
2.2.3. 전단시험 장치 30
2.2.4. 변형률 측정 장치 31
III. 결과 및 검토 32
3.1. 섬유방향 인장시험 32
3.1.1. 침수 전 섬유방향 인장시험 32
3.1.2. 15일 침수 후 섬유방향 인장시험 35
3.1.3. 1개월 침수 후 섬유방향 인장시험 37
3.1.4. 2개월 침수 후 섬유방향 인장시험 39
3.1.5. 3개월 후 침수 섬유방향 인장시험 41
3.1.6. 섬유방향 물성치 비교 43
3.2. 기지(Matrix)방향 인장시험 45
3.2.1. 침수 전 기지방향 인장시험 45
3.2.2. 15일 침수 후 기지방향 인장시험 47
3.2.3. 1개월 침수 후 기지방향 인장시험 49
3.2.4. 2개월 후 침수 기지방향 인장시험 51
3.2.5. 3개월 침수 후 기지방향 인장시험 53
3.2.6. 기지방향 물성치 비교 55
3.3. 전단시험 57
3.3.1. 침수 전 전단시험 57
3.3.2. 15일 침수 후 전단시험 60
3.3.3. 1개월 침수 후 전단시험 62
3.3.4. 2개월 침수 후 전단시험 64
3.3.5. 3개월 침수 후 전단시험 66
3.3.6./3.2.6. 전단 물성치 비교 68
IV. 결론 70
참고문헌 71
감사의 글 72
Table 2-1. Quantity of Specimens 15
Table 3-1. Dimensions of fiber direction tension test specimen before immersion 32
Table 3-2. Result of fiber direction tension test before immersion 34
Table 3-3. Dimensions of fiber direction tension test specimen for 15 day immersion 35
Table 3-4. Result of fiber direction tension test for 15 day immersion 36
Table 3-5. Dimensions of fiber direction tension test specimen for 1 month immersion 37
Table 3-6. Result of fiber direction tension test for 1 month immersion 38
Table 3-7. Dimensions of fiber direction tension test specimen for 2 months immersion 39
Table 3-8. Result of fiber direction tension test for 2 months immersion 40
Table 3-9. Dimensions of fiber direction tension test specimen for 3 months immersion 41
Table 3-10. Result of fiber direction tension test for 3 months immersion 42
Table 3-11. Dimensions of matrix direction tension test specimen before immersion 45
Table 3-12. Test result of matrix direction specimen before immersion 46
Table 3-13. Dimensions of matrix direction tension test specimen for 15 day immersion 47
Table 3-14. Test result of matrix direction specimen-15 day immersion 48
Table 3-15. Dimensions of matrix direction tension test specimen for 1 month immersion 49
Table 3-16. Test result of matrix direction specimen-1 month immersion 50
Table 3-17. Dimensions of matrix direction tension test specimen for 2 months immersion 51
Table 3-18. Test result of matrix direction specimen - 2 months immersion 52
Table 3-19. Dimensions of matrix direction tension test specimen for 3 months immersion 53
Table 3-20. Test result of matrix direction specimen - 3 months immersion 54
Table 3-21. Dimensions of shear test specimen - dry condition 57
Table 3-22. Result of Shear test - dry condition 59
Table 3-23. Dimensions of Shear test specimen - 15day immersion 60
Table 3-24. Result of Shear test - 15 day immersion 61
Table 3-25. Dimensions of Shear test specimen - 1 month immersion 62
Table 3-26. Result of Shear test - 1 month immersion 63
Table 3-27. Dimensions of Shear test specimen - 2 months immersion 64
Table 3-28. Result of Shear test - 2 months immersion 65
Table 3-29. Dimensions of Shear test specimen - 3 months immersion 66
Table 3-30./Table 3-28. Result of Shear test - 3 months immersion 67
Fig. 2-1. Set-up for curing 16
Fig. 2-2. Cure cycle for composite materials 17
Fig. 2-3. Fiber direction laminate after curing with Tab 17
Fig. 2-4. Autoclave 18
Fig. 2-5. Dimension of fiber direction tension test specimen 19
Fig. 2-6. Fiber direction tension test specimen 20
Fig. 2-7. Fiber direction tension test specimen with sealing tube 20
Fig. 2-8. Fiber direction tension test specimen with sensor 20
Fig. 2-9. Sensor (Strain gauge) 20
Fig. 2-10. Matrix direction laminate after curing 22
Fig. 2-11. Dimension of matrix direction tension test specimen 23
Fig. 2-12. Matrix direction tension test specimen 24
Fig. 2-13. Matrix direction tension test specimen with sealing tube 24
Fig. 2-14. Matrix direction tension test specimen with sensor 24
Fig. 2-15. Fiber direction laminate for shear test after curing with Tab 25
Fig. 2-16. Dimension of fiber direction shear test specimen 26
Fig. 2-17. Fiber direction shear test specimen 27
Fig. 2-18. Fiber direction shear test specimen with sensor 27
Fig. 2-19. Machine for notch generation 27
Fig. 2-20. Sensor for shear test 27
Fig. 2-21. Glass container for immersion of test specimen 28
Fig. 2-22. Equipment for tension and shear loading 29
Fig. 2-23. Special test fixture for shear test 30
Fig. 2-24. Amplifier and AD convert for measuring strain 31
Fig. 3-1. Failure modes of fiber direction tension test 33
Fig. 3-2. Strain-Stress curve of fiber direction tension test before immersion 34
Fig. 3-3. Strain-Stress curve of fiber direction tension test for 15 day immersion 36
Fig. 3-4. Strain-Stress curve of fiber direction tension test for 1 month immersion 38
Fig. 3-5. Strain-Stress curve of fiber direction tension test for 2 months immersion 40
Fig. 3-6. Strain-Stress curve of fiber direction tension test for 3 months immersion 42
Fig. 3-7. Strength of fiber direction for various immersion time 43
Fig. 3-8. Elastic modulus of fiber direction for various immersion time 44
Fig. 3-9. Poisson's ratio of fiber direction for various immersion time 44
Fig. 3-10. Failure modes of matrix direction tension test 46
Fig. 3-11. Strain-Stress curve of matrix direction tension test before immersion 46
Fig. 3-12. Strain-Stress curve of matrix direction tension test - 15 day immersion 48
Fig. 3-13. Strain-Stress curve of matrix direction tension test - 1 month immersion 50
Fig. 3-14. Strain-Stress curve of matrix direction tension test 2 months immersion 52
Fig. 3-15. Strain-Stress curve of matrix direction tension test-3 months immersion 54
Fig. 3-16. Strength of matrix direction for various immersion time 55
Fig. 3-17. Elastic modulus of matrix direction for various immersion time 56
Fig. 3-18. Poisson's ratio of matrix direction for various immersion time 56
Fig. 3-19. Failure modes of finer direction shear test 58
Fig. 3-20. Strain-Stress curve of fiber direction Shear test - dry condition 58
Fig. 3-21. Strain-Stress curve of fiber direction Shear test - 15 day immersion 61
Fig. 3-22. Strain-Stress curve of fiber direction Shear test - 1 month immersion 63
Fig. 3-23. Strain-Stress curve of fiber direction Shear test - 2 months immersion 65
Fig. 3-24. Strain-Stress curve of fiber direction Shear test - 3 months immersion 67
Fig. 3-25. Shear strength of fiber direction for various immersion time 68
Fig. 3-26. Shear modulus of fiber direction for various immersion time 69