感謝의 글
Nomenclature
國文要約
Contents
제 1 장 서론 17
제1절 연구 배경 17
제2절 연구 동향 19
제3절 연구 방법 및 목적 20
제 2 장 이론적 배경 21
제1절 와전류 탐상시험의 원리 21
제2절 시험 코일의 이론 23
1. 와전류 탐상의 기본구성 23
2. 와전류 탐상 시험의 브릿지 회로 25
제 3 장 실험장치 및 방법 27
제1절 실험장치 27
제2절 실험방법 29
제3절 시험편(튜브)재료의 특성 30
제4절 시험코일의 제작 34
제5절 표준시험편의 제작 38
제6절 인공결함 시험편의 제작 40
제 4 장 실험 결과 및 고찰 42
제1절 내삽코일에 의한 표준시험편 신호분석 42
제2절 관통코일에 의한 표준시험편 신호분석 46
제3절 내삽 및 관통코일을 이용한 인공결함 시험편의 신호분석 50
1. 내삽코일을 이용한 인공결함 시험편의 신호분석 50
2. 관통코일을 이용한 인공결함 시험편의 신호분석 53
제4절 내삽코일에 의한 표준시험편의 신호 56
제5절 관통코일에 의한 표준시험편의 신호 64
제 5 장 결론 72
참고문헌 74
ABSTRACT 76
Table 3-1 Material Characteristics of the Tube Specimen 30
Table 3-2 Fill - Factor of Tube Type 35
Table 3-3 Bare -Tube Bobbin Coil Characteristics 36
Table 3-4 Turbo C-(or E) Tube Bobbin Coil Characteristics 36
Table 3-5 Encircling Coil Characteristics 36
Table 3-6 ASME Calibration Standard Tube Hole depth 38
Table 3-7 Dimension of Artificial Discontinuities(hole and notch) on each tube 40
Fig. 2.1 Principal of Eddy Current Test 22
Fig. 2.2 Internal Function of the Eddy Current Test 24
Fig. 2.3 General Bridge Circuit 26
Fig. 2.4 Differential Coils Bridge Circuits of Eddy Current Tester 26
Fig. 3.1 Block Diagram of Eddy Current Test 27
Fig. 3.2 Miz-30-4 of the eddy current tester 28
Fig. 3.3 Zetec-Eddynet program of computer instrument 28
Fig. 3.4 Bare-Tube 31
Fig. 3.5 Turbo C-Tube 32
Fig. 3.6 Turbo E-Tube 32
Fig. 3.7 Rollet 33
Fig. 3.8 Rolling Edge 33
Fig. 3.9 Bobbin Coil 35
Fig. 3.10 Encircling Coil 35
Fig. 3.11 Encircling Coil 37
Fig. 3.12 Bobbin Coil 37
Fig. 3.13 ASME Calibration Standard Tube 39
Fig. 3.14 ASTM Calibration Standard Tubes specimen 39
Fig. 3.15 Tube specimen with artificial discontinuities(hole and notch) 41
Fig. 3.16 Tube specimen with artificial discontinuities(hole and notch) 41
Fig. 4.1 Amplitude versus frequency on 100% hole(aperture) of each tube when testing with inner coil 42
Fig. 4.2 Depth versus phase angle on Bare Tube when testing with inner coil in different frequency 44
Fig. 4.3 Depth versus phase angle on Turbo C-Tube when testing with inner coil in different frequency 44
Fig. 4.4 Depth versus phase angle on Turbo E-Tube when testing with inner coil in different frequency 45
Fig. 4.5 Amplitude versus frequency on artificial discontinuities (20%thinning) of each tube which is milled according to ASME standard 45
Fig. 4.6 Amplitude versus frequency on 100% hole(aperture) of each tube when testing with encircling coil 46
Fig. 4.7 Depth versus phase angle on Bare Tube when testing with encircling coil in different frequency 48
Fig. 4.8 Depth versus phase angle on Turbo C-Tube when testing with encircling coil in different frequency 48
Fig. 4.9 Depth versus phase angle on Turbo E-Tube when testing with encircling coil in different frequency 49
Fig. 4.10 Amplitude versus frequency on artificial discontinuities (20% thinning) of each tube which is milled according to ASME standard 49
Fig. 4.11 Display screen showing signal and amplitude(phase angle 40�) on 100% thinning(aperture) of Bare Tube when testing with inner coil 51
Fig. 4.12 Display screen showing signal and amplitude(phase angle 40�) on 100% thinning(aperture) of Turbo C-Tube when testing with inner coil 51
Fig. 4.13 Display screen showing signal and amplitude(phase angle 40�) on 100% thinning(aperture) of Turbo E-Tube when testing with inner coil 52
Fig. 4.14 Display screen showing signal and amplitude(phase angle 40�) on 100% thinning(aperture) of Bare Tube when testing with encircling coil 54
Fig. 4.15 Display screen showing signal and amplitude(phase angle 40�) on 100% thinning(aperture) of Turbo C-Tube when testing with encircling coil 54
Fig. 4.16 Display screen showing signal and amplitude(phase angle 40�) on 100% thinning(aperture) of Turbo E-Tube when testing with encircling coil 55
Fig. 4.17 Display screen showing signal and amplitude(phase angle 40�) on 100% thinning(aperture) of Bare Tube when testing with inner coil 56
Fig. 4.18 Display screen showing signal and amplitude(phase angle 122�) on 80% thinning of Bare Tube when testing with inner coil 57
Fig. 4.19 Display screen showing signal and amplitude(phase angle 159�) on 60% thinning of Bare Tube when testing with inner coil 57
Fig. 4.20 Display screen showing signal and amplitude(phase angle 187�) on 40% thinning of Bare Tube when testing with inner coil 58
Fig. 4.21 Display screen showing signal and amplitude(phase angle 194�) on 20% thinning of Bare Tube when testing with inner coil 58
Fig. 4.22 Display screen showing signal and amplitude(phase angle 40�) on 100% thinning(aperture) of Turbo C-Tube when testing inner coil 59
Fig. 4.23 Display screen showing signal and amplitude(phase angle 71�) on 80% thinning of Turbo C-Tube when testing with inner coil 59
Fig. 4.24 Display screen showing signal and amplitude(phase angle 149�) on 60% thinning of Turbo C-Tube when testing with inner coil 60
Fig. 4.25 Display screen showing signal and amplitude(phase angle 190�) on 40% thinning of Turbo C-Tube when testing with inner coil 60
Fig. 4.26 Display screen showing signal and amplitude(phase angle 209�) on 20% thinning of Turbo C-Tube when testing with inner coil 61
Fig. 4.27 Display screen showing signal and amplitude(phase angle 40�) on 100% thinning(aperture) of Turbo E-Tube when testing with inner coil 61
Fig. 4.28 Display screen showing signal and amplitude(phase angle 75�) on 80% thinning of Turbo E-Tube when testing with inner coil 62
Fig. 4.29 Display screen showing signal and amplitude(phase angle 155�) on 60% thinning of Turbo E-Tube when testing with inner coil 62
Fig. 4.30 Display screen showing signal and amplitude(phase angle 202�) on 40% thinning of Turbo E-Tube when testing with inner coil 63
Fig. 4.31 Display screen showing signal and amplitude(phase angle 205�) on 20% thinning of Turbo E-Tube when testing with inner coil 63
Fig. 4.32 Display screen showing signal and amplitude(phase angle 130�) on 100% thinning(aperture) of Bare Tube when testing with encircling coil 64
Fig. 4.33 Display screen showing signal and amplitude (phase angle 101°) on 80% thinning of Bare Tube when testing with encircling coil 65
Fig. 4.34 Display screen showing signal and amplitude (phase angle 101°) on 60% thinning of Bare Tube when testing with encircling coil 65
Fig. 4.35 Display screen showing signal and amplitude(phase angle 109�) on 40% thinning of Bare Tube when testing with encircling coil 66
Fig. 4.36 Display screen showing signal and amplitude (phase angle 118°) on 20% thinning of Bare Tube when testing with encircling coil 66
Fig. 4.37 Display screen showing signal and amplitude(phase angle 130�) on 100% thinning(aperture) of Turbo-C tube when testing with encircling coil 67
Fig. 4.38 Display screen showing signal and amplitude(phase angle 131°) on 80% thinning of Turbo-C tube when testing with encircling coil 67
Fig. 4.39 Display screen showing signal and amplitude (phase angle116�) on 60% thinning of Turbo-C tube when testing with encircling coil 68
Fig. 4.40 Display screen showing signal and amplitude(phase angle 105°) on 40% thinning of Turbo-C tube when testing with encircling coil 68
Fig. 4.41 Display screen showing signal and amplitude (phase angle 100�) on 20% thinning of Turbo-C tube when testing with encircling coil 69
Fig. 4.42 Display screen showing signal and amplitude(phase angle 130�) on 100% thinning(aperture) of Turbo-E tube when testing with encircling coil 69
Fig. 4.43 Display screen showing signal and amplitude(phase angle 125�) on 80% thinning of Turbo-E tube when testing with encircling coil 70
Fig. 4.44 Display screen showing signal and amplitude(phase angle 113�) on 60% thinning of Turbo-E tube when testing with encircling coil 70
Fig. 4.45 Display screen showing signal and amplitude(phase angle 103�) on 40% thinning of Turbo-E tube when testing with encircling coil 71
Fig. 4.46 Display screen showing signal and amplitude(phase angle 102�) on 20% thinning of Turbo-E tube when testing with encircling coil 71