感謝의 글
國文要約
Contets
제 1 장 서론 17
제1절 연구 배경 17
제2절 연구 동향 19
제3절 연구 목적 20
제 2 장 이론적 배경 22
제1절 와전류 탐상의 시험 원리 22
제2절 시험코일의 이론 24
제3절 와전류탐상장치의 구성과 신호처리 27
1. 브리지회로 29
2. 검사주파수와 침투깊이의 관계 31
제 3 장 실험장치 및 방법 34
제1절 실험 장치 34
제2절 실험 방법 37
제3절 시험편의 재료특성과 형상 37
제4절 시험코일의 제작 40
제5절 시험편 제작 43
제 4 장 실험결과 및 고찰 46
제1절 최적주파수 46
제2절 3종류의 결함에 따른 신호분석 48
제3절 원형결함을 갖는 시험편의 와전류탐상 신호 50
제4절 축방향결함을 갖는 시험편의 와전류탐상 신호 73
제5절 원주방향결함을 갖는 시험편의 와전류탐상 신호 79
제 5 장 결론 85
參考文獻 86
ABSTRACT 88
Table 3-1 Material Characteristics of the Tube Specimen 37
Table 3-2 The Dimension of Fin Tubes 39
Table 3-3 Bobbin Coil Characteristics 41
Table 3-4 Artificial Defect Dimension on Fin Tube 44
Fig. 2.1 A Visual Representation of Electromagnetic Interactions. 23
Fig. 2.2 Typical impedance-plane diagram by placing an inspection coil sequentially on a series of thick pieces metal, each with differential IACS electrical resistance or conductivity rating. The inspection frequency was 100kHz 26
Fig. 2.3 Internal Function of the Eddy Current Test. 28
Fig. 2.4 General Bridge Circuit of Eddy Current Test. 30
Fig. 2.5 Differential Coils Bridge Circuits of Eddy Current Test. 30
Fig. 2.6 Eddy Current in any material. 33
Fig. 2.7 Relative Eddy Current Density. 33
Fig. 3.1 3D Non-contact Measuring Machine. 35
Fig. 3.2 Eddy Current Testing System. 36
Fig. 3.3 Rollet. 38
Fig. 3.4 Sectional Diagram of Fin Tube. 38
Fig. 3.5 Section of Fin Tubes. 39
Fig. 3.6 Bobbin Coil. 41
Fig. 3.7 Bobbin Coil. 42
Fig. 3.8 The Fin Tube Specimens with Artificial Flaws. 43
Fig. 3.9 Artificial Defect Diagram on Fin Tube. 44
Fig. 3.10 Electrode 45
Fig. 3.11 Tube Specimen with Artificial Defects. 45
Fig. 4.1 Depth versus phase angle on Fin Tube(C-L) in different frequency. 47
Fig. 4.2 Depth versus phase angle on Fin Tube(C-M) in different frequency. 47
Fig. 4.3 Depth versus phase angle on Fin Tube(C-H) in different frequency. 48
Fig. 4.4 Depth versus phase angle on Fin Tube(Low) in different Defects. 49
Fig. 4.5 Depth versus phase angle on Fin Tube(Middle) in different Defects. 49
Fig. 4.6 Depth versus phase angle on Fin Tube(High) in different Defects. 50
Fig. 4.7 Display screen showing signal and amplitude(phase angle 26°) on 60% of Fin Tube(C-L) when testing with 16㎑. 50
Fig. 4.8 Display screen showing signal and amplitude(phase angle 24°) on 40% of Fin Tube(C-L) when testing with 16㎑. 51
Fig. 4.9 Display screen showing signal and amplitude(phase angle 20°) on 20% of Fin Tube(C-L) when testing with 16㎑. 51
Fig. 4.10 Display screen showing signal and amplitude(phase angle 24°) on 60% of Fin Tube(C-L) when testing with 14㎑. 52
Fig. 4.11 Display screen showing signal and amplitude(phase angle 22°) on 40% of Fin Tube(C-L) when testing with 14㎑. 52
Fig. 4.12 Display screen showing signal and amplitude(phase angle 19°) on 20% of Fin Tube(C-L) when testing with 14㎑. 53
Fig. 4.13 Display screen showing signal and amplitude(phase angle 21°) on 60% of Fin Tube(C-L) when testing with 12㎑. 53
Fig. 4.14 Display screen showing signal and amplitude(phase angle 18°) on 40% of Fin Tube(C-L) when testing with 12㎑. 54
Fig. 4.15 Display screen showing signal and amplitude(phase angle 15°) on 20% of Fin Tube(C-L) when testing with 12㎑. 54
Fig. 4.16 Display screen showing signal and amplitude(phase angle 22°) on 60% of Fin Tube(C-L) when testing with 10㎑. 55
Fig. 4.17 Display screen showing signal and amplitude(phase angle 20°) on 40% of Fin Tube(C-L) when testing with 10㎑. 55
Fig. 4.18 Display screen showing signal and amplitude(phase angle 18°) on 20% of Fin Tube(C-L) when testing with 10㎑. 56
Fig. 4.19 Display screen showing signal and amplitude(phase angle 25°) on 60% of Fin Tube(C-L) when testing with 8㎑. 56
Fig. 4.20 Display screen showing signal and amplitude(phase angle 23°) on 40% of Fin Tube(C-L) when testing with 8㎑. 57
Fig. 4.21 Display screen showing signal and amplitude(phase angle 14°) on 20% of Fin Tube(C-L) when testing with 8㎑. 57
Fig. 4.22 Display screen showing signal and amplitude(phase angle 34°) on 60% of Fin Tube(C-M) when testing with 16㎑. 58
Fig. 4.23 Display screen showing signal and amplitude(phase angle 31°) on 40% of Fin Tube(C-M) when testing with 16㎑. 58
Fig. 4.24 Display screen showing signal and amplitude(phase angle 24°) on 20% of Fin Tube(C-M) when testing with 16㎑. 59
Fig. 4.25 Display screen showing signal and amplitude(phase angle 33°) on 60% of Fin Tube(C-M) when testing with 14㎑. 59
Fig. 4.26 Display screen showing signal and amplitude(phase angle 31°) on 40% of Fin Tube(C-M) when testing with 14㎑. 60
Fig. 4.27 Display screen showing signal and amplitude(phase angle 23°) on 20% of Fin Tube(C-M) when testing with 14㎑. 60
Fig. 4.28 Display screen showing signal and amplitude(phase angle 32°) on 60% of Fin Tube(C-M) when testing with 12㎑. 61
Fig. 4.29 Display screen showing signal and amplitude(phase angle 27°) on 40% of Fin Tube(C-M) when testing with 12㎑. 61
Fig. 4.30 Display screen showing signal and amplitude(phase angle 21°) on 20% of Fin Tube(C-M) when testing with 12㎑. 62
Fig. 4.31 Display screen showing signal and amplitude(phase angle 32°) on 60% of Fin Tube(C-M) when testing with 10㎑. 62
Fig. 4.32 Display screen showing signal and amplitude(phase angle 27°) on 40% of Fin Tube(C-M) when testing with 10㎑. 63
Fig. 4.33 Display screen showing signal and amplitude(phase angle 20°) on 20% of Fin Tube(C-M) when testing with 10㎑. 63
Fig. 4.34 Display screen showing signal and amplitude(phase angle 33°) on 60% of Fin Tube(C-M) when testing with 8㎑. 64
Fig. 4.35 Display screen showing signal and amplitude(phase angle 26°) on 40% of Fin Tube(C-M) when testing with 8㎑. 64
Fig. 4.36 Display screen showing signal and amplitude(phase angle 18°) on 20% of Fin Tube(C-M) when testing with 8㎑. 65
Fig. 4.37 Display screen showing signal and amplitude(phase angle 39°) on 60% of Fin Tube(C-H) when testing with 16㎑. 65
Fig. 4.38 Display screen showing signal and amplitude(phase angle 34°) on 40% of Fin Tube(C-H) when testing with 16㎑. 66
Fig. 4.39 Display screen showing signal and amplitude(phase angle 30°) on 20% of Fin Tube(C-H) when testing with 16㎑. 66
Fig. 4.40 Display screen showing signal and amplitude(phase angle 38°) on 60% of Fin Tube(C-H) when testing with 14㎑. 67
Fig. 4.41 Display screen showing signal and amplitude(phase angle 35°) on 40% of Fin Tube(C-H) when testing with 14㎑. 67
Fig. 4.42 Display screen showing signal and amplitude(phase angle 30°) on 20% of Fin Tube(C-H) when testing with 14㎑. 68
Fig. 4.43 Display screen showing signal and amplitude(phase angle 34°) on 60% of Fin Tube(C-H) when testing with 12㎑. 68
Fig. 4.44 Display screen showing signal and amplitude(phase angle 29°) on 40% of Fin Tube(C-H) when testing with 12㎑. 69
Fig. 4.45 Display screen showing signal and amplitude(phase angle 25°) on 20% of Fin Tube(C-H) when testing with 12㎑. 69
Fig. 4.46 Display screen showing signal and amplitude(phase angle 36°) on 60% of Fin Tube(C-H) when testing with 10㎑. 70
Fig. 4.47 Display screen showing signal and amplitude(phase angle 32°) on 40% of Fin Tube(C-H) when testing with 10㎑. 70
Fig. 4.48 Display screen showing signal and amplitude(phase angle 29°) on 20% of Fin Tube(C-H) when testing with 10㎑. 71
Fig. 4.49 Display screen showing signal and amplitude(phase angle 34°) on 60% of Fin Tube(C-H) when testing with 8㎑. 71
Fig. 4.50 Display screen showing signal and amplitude(phase angle 32°) on 40% of Fin Tube(C-H) when testing with 8㎑. 72
Fig. 4.51 Display screen showing signal and amplitude(phase angle 29°) on 20% of Fin Tube(C-H) when testing with 8㎑. 72
Fig. 4.52 Depth Versus Phase Angle on Fin Tube(Defect-A) in Different Fin Height. 73
Fig. 4.53 Display Screen Showing Signal and Amplitude(Phase Angle 16°) on 60% of Fin Tube(A-L) when testing with 12㎑. 74
Fig. 4.54 Display Screen Showing Signal and Amplitude(Phase Angle 15°) on 40% of Fin Tube(A-L) when testing with 12㎑. 74
Fig. 4.55 Display Screen Showing Signal and Amplitude(Phase Angle 10°) on 20% of Fin Tube(A-L) when testing with 12㎑. 75
Fig. 4.56 Display Screen Showing Signal and Amplitude(Phase Angle 23°) on 60% of Fin Tube(A-M) when testing with 12㎑. 75
Fig. 4.57 Display Screen Showing Signal and Amplitude(Phase Angle 19°) on 40% of Fin Tube(A-M) when testing with 12㎑. 76
Fig. 4.58 Display Screen Showing Signal and Amplitude(Phase Angle 13°) on 20% of Fin Tube(A-M) when testing with 12㎑. 76
Fig. 4.59 Display Screen Showing Signal and Amplitude(Phase Angle 21°) on 60% of Fin Tube(A-H) when testing with 12㎑. 77
Fig. 4.60 Display Screen Showing Signal and Amplitude(Phase Angle 15°) on 40% of Fin Tube(A-H) when testing with 12㎑. 77
Fig. 4.61 Display Screen Showing Signal and Amplitude(Phase Angle 11°) on 20% of Fin Tube(A-H) when testing with 12㎑. 78
Fig. 4.62 Depth Versus Phase Angle on Fin Tube(Defect-B) in Different Fin Height. 79
Fig. 4.63 Display Screen Showing Signal and Amplitude(Phase Angle 17°) on 60% of Fin Tube(B-L) when testing with 12㎑. 80
Fig. 4.64 Display Screen Showing Signal and Amplitude(Phase Angle 13°) on 40% of Fin Tube(B-L) when testing with 12㎑. 80
Fig. 4.65 Display Screen Showing Signal and Amplitude(Phase Angle 9°) on 20% of Fin Tube(B-L) when testing with 12㎑. 81
Fig. 4.66 Display Screen Showing Signal and Amplitude(Phase Angle 23°) on 60% of Fin Tube(B-M) when testing with 12㎑. 81
Fig. 4.67 Display Screen Showing Signal and Amplitude(Phase Angle 21°) on 40% of Fin Tube(B-M) when testing with 12㎑. 82
Fig. 4.68 Display Screen Showing Signal and Amplitude(Phase Angle 17°) on 20% of Fin Tube(B-M) when testing with 12㎑. 82
Fig. 4.69 Display Screen Showing Signal and Amplitude(Phase Angle 21°) on 60% of Fin Tube(B-H) when testing with 12㎑. 83
Fig. 4.70 Display Screen Showing Signal and Amplitude(Phase Angle 18°) on 40% of Fin Tube(B-H) when testing with 12㎑. 83
Fig. 4.71 Display Screen Showing Signal and Amplitude(Phase Angle 14°) on 20% of Fin Tube(B-H) when testing with 12㎑. 84