표제지
목차
國文要略 13
제1장 서론 14
1.1. 연구 배경 14
1.2. 연구 목표 19
제2장 이론적 배경 20
2.1. 복합재료(Composite Materials) 20
2.1.1. 복합재료의 정의 20
2.1.2. 복합재료의 일반적 개념 23
2.1.3. 복합재료의 제조방법 26
2.2. 적층판 복합재료 역학 27
2.2.1. 고전적 적층이론(CLT, Classical Laminate Theory) 27
2.2.2. 적층판의 강도해석 30
2.3. 복합재료적층 구조이론 31
2.3.1. 기본이론 32
2.3.2. 파손강도 기준 37
2.4. 전자파 이론 43
2.4.1. 전자파 이론 및 성질 43
2.4.2. 전자파 차폐적용 이론 44
3.3.3. 차폐효과 성능 계산 50
2.5. ASTM D 4935-10 규정에 따른 차폐율 측정 방법 53
제3장 시험편 제작 및 시험방법 57
3.1. 시험편 제작 및 물성시험 57
3.1.1. 인장시험 61
3.1.2. 압축시험 69
제4장 반발특성에 따른 충돌 결과 75
4.1. 유한요소해석을 위한 충격해석 모델 및 조건 75
4.2. 프리프레그 두께에 따른 충격거동 결과 76
4.2.1. 복합소재판의 충격거동 해석결과 76
4.2.2. 복합소재판의 충격거동 실험결과 95
제5장 전자파 차폐 실험결과 106
5.1. 프리프레그 섬유 배열과 두께에 따른 전자파 실험 106
5.2. 전자파 차폐 실험결과 107
제6장 결론 110
References 113
Abstract 118
Table 3.1. Composition of tested CFRPs 57
Table 3.2. Material properties of tested CFRPs 58
Table 3.3. Summary of tensile test results for 0.1mm prepreg 65
Table 3.4. Summary of tensile test results for 0.05mm prepreg 66
Table 3.5. Summary of compression test results for 0.1mm prepreg 73
Table 3.6. Summary of compressive test results for 0.05mm prepreg 74
Table 4.1. Analysis condition for drop weight impact test 76
Table 4.2. Summary of impact test results for 0.1mm prepreg plate 79
Table 4.3. Summary of impact test results for 0.05mm prepreg plate 79
Table 4.4. Summary of Drop weight experiment results for 0.1mm prepreg plate 101
Table 4.5. Summary of Drop weight experiment results for 0.05mm prepreg plate 101
Table 4.6. Error rate of medium velocity analysis and experiment 105
Table 4.7. Error rate of low velocity analysis and experiment 105
Table 5.1. Summary of electromagnetic shielding test results for tested CFRP specimens 108
Fig. 1.1. Classification of impact velocities 15
Fig. 1.2. Modeling methods for a composite laminate finite element model 17
Fig. 2.1. Classification of composite materials 21
Fig. 2.2. Fiber array in composite material 22
Fig. 2.3. Manufacturing process using autoclave molding 26
Fig. 2.4. Principal axis and laminate axis for stress analysis 32
Fig. 2.5. The fracture plane of the puck failure criterion 40
Fig. 2.6. Definition of stresses τn, τnt, τn1 on a fiber parallel plate which inclined to the action plane of stresses σ₂ by angle θ[이미지참조] 40
Fig. 2.7. Schematic of reflection, absorption and multi-reflection of electromagnetic waves 44
Fig. 2.8. Arrangements to measure the shielding effectiveness of materials 46
Fig. 2.9. Magnetic reflections in the area 49
Fig. 2.10. Shielding range in the incident electromagnetic wave 50
Fig. 2.11. Auto SE measurement system using coaxial holder 54
Fig. 2.12. The structure of flanged circular coaxial transmission line holder 55
Fig. 3.1. Manufacturing process of CFRP plate 59
Fig. 3.2. Curing cycle of CFRP stacking specimen 60
Fig. 3.3. Experimental apparatus for tensile test 61
Fig. 3.4. Sketch of CFRP specimen [0˚]for tensile testing 62
Fig. 3.5. Sketch of CFRP specimen [90˚]for tensile testing 62
Fig. 3.6. Picture of CFRP specimens before tensile testing 63
Fig. 3.7. Picture of CFRP specimens after tensile testing 64
Fig. 3.8. Experimental result of tensile testing for 0˚ specimens with respect to strain (0.1mm prepreg) 66
Fig. 3.9. Experimental result of tensile testing for 90˚ specimens with respect to strain (0.1mm prepreg) 67
Fig. 3.10. Experimental result of tensile testing for 0˚ specimens with respect to strain (0.05mm prepreg) 67
Fig. 3.11. Experimental result of tensile testing for 90˚ specimens with respect to strain (0.05mm prepreg) 68
Fig. 3.12. Sketch of CFRP specimen for compression test 69
Fig. 3.13. Picture of CFRP specimens before compression test 69
Fig. 3.14. Picture of CFRP specimens after compression test 70
Fig. 3.15. Experimental apparatus for compression test 70
Fig. 3.16. Experimental result of compression test for 0˚ specimens with respect to strain (0.1mm prepreg) 71
Fig. 3.17. Experimental result of compression test for 90˚ specimens with respect to strain (0.1mm prepreg) 72
Fig. 3.18. Experimental result of compression test for 0˚ specimens with respect to strain (0.05mm prepreg) 72
Fig. 3.19. Experimental result of compression test for 90˚ specimens with respect to strain (0.05mm prepreg) 73
Fig. 4.1. Modeling for impact analysis 75
Fig. 4.2. Simulation result of impact analysis for 0.1mm prepreg plate 78
Fig. 4.3. Simulation result of impact analysis for 0.05mm prepreg plate 78
Fig. 4.4. Equivalent stress for impact velocity of 5m/s [45˚/-45˚/0˚/90˚/0˚]6ply[이미지참조] 80
Fig. 4.5. Total deformation for impact velocity of 5m/s [45˚/-45˚/0˚/90˚/0˚]6ply[이미지참조] 80
Fig. 4.6. Equivalent stress for impact velocity of 3m/s [45˚/-45˚/0˚/90˚/0˚]6ply[이미지참조] 81
Fig. 4.7. Total deformation for impact velocity of 3m/s [45˚/-45˚/0˚/90˚/0˚]6ply[이미지참조] 81
Fig. 4.8. Analysis of puck failure for 3m/s [45˚/-45˚/0˚/90˚/0˚]6ply[이미지참조] 82
Fig. 4.9. Analysis of puck failure for 5m/s [45˚/-45˚/0˚/90˚/0˚]6ply[이미지참조] 82
Fig. 4.10. Equivalent stress for impact velocity of 5m/s [0˚/90˚]15ply[이미지참조] 83
Fig. 4.11. Total deformation for impact velocity of 5m/s [0˚/90˚]15ply[이미지참조] 83
Fig. 4.12. Equivalent stress for impact velocity of 3m/s [0˚/90˚]15ply[이미지참조] 84
Fig. 4.13. Total deformation for impact velocity of 3m/s [0˚/90˚]15ply[이미지참조] 84
Fig. 4.14. Analysis of puck failure for 3 m/s [0˚/90˚]15ply[이미지참조] 85
Fig. 4.15. Analysis of puck failure for 5 m/s [0˚/90˚]15ply[이미지참조] 85
Fig. 4.16. Equivalent stress for impact velocity of 5m/s [45˚/-45˚]15ply[이미지참조] 86
Fig. 4.17. Total deformation for impact velocity of 5m/s [45˚/-45˚]15ply[이미지참조] 86
Fig. 4.18. Equivalent stress for impact velocity of 3m/s [45˚/-45˚]15ply[이미지참조] 87
Fig. 4.19. Total deformation for impact velocity of 3m/s [45˚/-45˚]15ply[이미지참조] 87
Fig. 4.20. Analysis of puck failure for 3 m/s [45˚/-45˚]15ply[이미지참조] 88
Fig. 4.21. Analysis of puck failure for 5 m/s [45˚/-45˚]15ply[이미지참조] 88
Fig. 4.22. Equivalent stress for impact velocity of 5m/s [45˚/-45˚/0˚/90˚/0˚]12ply[이미지참조] 89
Fig. 4.23. Total deformation for impact velocity of 5m/s [45˚/-45˚/0˚/90˚/0˚]12ply[이미지참조] 89
Fig. 4.24. Equivalent stress for impact velocity of 3m/s [45˚/-45˚/0˚/90˚/0˚]12ply[이미지참조] 90
Fig. 4.25. Total deformation for impact velocity of 3m/s [45˚/-45˚/0˚/90˚/0˚]12ply[이미지참조] 90
Fig. 4.26. Analysis of puck failure for 3m/s [45˚/-45˚/0˚/90˚/0˚]12ply[이미지참조] 91
Fig. 4.27. Analysis of puck failure for 5m/s [45˚/-45˚/0˚/90˚/0˚]12ply[이미지참조] 91
Fig. 4.28. Equivalent stress for impact velocity of 5m/s [0˚/90˚]30ply[이미지참조] 92
Fig. 4.29. Total deformation for impact velocity of 5m/s [0˚/90˚]30ply[이미지참조] 92
Fig. 4.30. Equivalent stress for impact velocity of 3m/s [0˚/90˚]30ply[이미지참조] 93
Fig. 4.31. Total deformation for impact velocity of 3m/s [0˚/90˚]30ply[이미지참조] 93
Fig. 4.32. Analysis of puck failure for 3m/s [0˚/90˚]30ply[이미지참조] 94
Fig. 4.33. Analysis of puck failure for 5m/s [0˚/90˚]30ply[이미지참조] 94
Fig. 4.34. Experimental facility for drop weight impact test 97
Fig. 4.35. Detailed view of test section 98
Fig. 4.36. CFRP specimens for impact test 98
Fig. 4.37. Drop height experiment results of 0.1mm prepreg plate 100
Fig. 4.38. Drop height experiment results of 0.05mm prepreg plate 100
Fig. 4.39. Comparative results of experiment and analysis according to case 104
Fig. 5.1. Processing of the electromagnetic wave shielding experiments 106
Fig. 5.2. Drawings of CFRP specimen for electromagnetic shielding test 106
Fig. 5.3. Experimental result of electromagnetic shielding effectiveness for 0.1mm prepreg as a function of frequency ranged... 109
Fig. 5.4. Experimental result of electromagnetic shielding effectiveness for 0.05mm prepreg as a function of frequency ranged between 100MHz~2GHz 109