- Page 1 and 2: Electromagnetic Testing MFLT/ ECT/
- Page 3 and 4: Aerospace Applications Charlie Chon
- Page 5 and 6: Aerospace Applications Charlie Chon
- Page 7 and 8: Aerospace Applications Charlie Chon
- Page 9 and 10: Aerospace Applications Charlie Chon
- Page 11 and 12: Aerospace Applications Charlie Chon
- Page 13 and 14: Aerospace Applications Charlie Chon
- Page 15 and 16: Vertical Take Off Plane ■ https:/
- Page 17 and 18: Vertical Take Off Plane ■ https:/
- Page 19 and 20: Charlie Chong/ Fion Zhang
- Page 21 and 22: Greek letter Charlie Chong/ Fion Zh
- Page 23 and 24: 18.1 PART 1. Introduction to Eddy C
- Page 25 and 26: Aluminum Exfoliation Charlie Chong/
- Page 27 and 28: Titanium - Brazing and Soldering Wh
- Page 29 and 30: Titanium Aluminide - Through extens
- Page 31 and 32: Titanium Aluminide Charlie Chong/ F
- Page 33 and 34: Titanium Aluminide Charlie Chong/ F
- Page 35: 18.1.2 Testing of Aluminum Alloys T
- Page 39 and 40: ■ Classification of Coatings and
- Page 41 and 42: 18.2.2 Metal Thickness Tests for me
- Page 43 and 44: A technique called null balancing c
- Page 45 and 46: FIGURE 2. Relative instrument readi
- Page 47 and 48: The important fact illustrated in F
- Page 49 and 50: FIGURE 3. Impedance graphs showing
- Page 51 and 52: 18.2.4 Nonconductive Coating Thickn
- Page 53 and 54: Vertical Liftoff Charlie Chong/ Fio
- Page 55 and 56: FIGURE 5. Chart for determining sta
- Page 57 and 58: 18.2.6 Metal Spacing There are time
- Page 59 and 60: FIGURE 6. Probe coil impedance curv
- Page 61 and 62: 18.3.1 Control of Tests Important c
- Page 63 and 64: ■ Laboratory Evaluations Laborato
- Page 65 and 66: The reference standards are identif
- Page 67 and 68: Although the conductivity of copper
- Page 69 and 70: ■ Laboratory Evaluation of Alumin
- Page 71 and 72: ■ Curved Surfaces Eddy current te
- Page 73 and 74: FIGURE 8. Influence of cylindrical
- Page 75 and 76: FIGURE 9. Influence of edge effect
- Page 77 and 78: The phase angle lag θ (radian) use
- Page 79 and 80: FIGURE 10. Conductivity variations
- Page 81 and 82: Whatever the test material is, it m
- Page 83 and 84: FIGURE 11. Conductivity change as f
- Page 85 and 86: Eddy current conductivity testing (
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■ Test Material Temperatures Temp
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18.4 PART 4. Eddy Current Testing o
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Bolt Holes Charlie Chong/ Fion Zhan
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FIGURE 12. Eddy current hole probe.
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FIGURE 13. Normalized impedance gra
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18.4.1 Reference Standards for Bolt
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FIGURE 15. Calibration block for bo
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Calibration block for bolt hole and
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18.4.2 Procedure for Bolt Hole Test
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FIGURE 16. Strip chart indications
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Other rotating eddy current test sy
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FIGURE 17. Cathode ray tube display
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Eddy Current Bolt Hole Testing http
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Eddy Current Bolt Hole Testing http
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Charlie Chong/ Fion Zhang FIGURE 18
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Continuously changing the magnitude
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Examples of: • metal thinning are
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Penetration depth, however, is only
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This location for the material test
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The probe is placed on the taper ga
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FIGURE 19. Screen display calibrati
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FIGURE 20. Impedance plane screen d
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■ Metal Spacing During fabricatio
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FIGURE 21. Eddy current reference s
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FIGURE 21. Eddy current reference s
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FIGURE 22. Eddy current impedance p
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FIGURE 23. Eddy current impedance p
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Intergranular corrosion occurs alon
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The phase angle between the liftoff
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FIGURE 24. Eddy current cathode ray
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FIGURE 24. Eddy current cathode ray
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Figure 25b shows that for aluminum
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Airframe Structures- longerons Char
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FIGURE 25. Notches and cracks at 20
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FIGURE 26. Direction of surface cra
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FIGURE 27. Cracks in first layer in
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The liftoff locus is rotated about
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FIGURE 28. Improving test results a
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FIGURE 28. Improving test results a
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FIGURE 29. Direction of surface and
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18.6 PART 6. Low Frequency Eddy Cur
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The effective depth of penetration
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■ Applications for Low Frequency
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FIGURE 31. Typical applications for
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Intergranular Corrosion Charlie Cho
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Although the low frequency, 500 Hz
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FIGURE 32. Instrument response at 5
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FIGURE 33. Cracks in second layer i
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FIGURE 34. Detection of crack in se
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FIGURE 35. Detection of crack in se
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Fatigue cracks caused by pressuriza
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FIGURE 36. Window belt crack locati
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18.6.2 Automated Fastener Hole Test
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18.6.3 Conclusion Eddy current test
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18.7 PART 7. Eddy Current Testing o
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Jet Engine Charlie Chong/ Fion Zhan
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The aviation community recognizes t
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Therefore, a minimum of two or thre
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FIGURE 37. Probability of detection
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18.7.3 Standard versus Complex Geom
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FIGURE 39. Discontinuity locations
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FIGURE 39. Discontinuity locations
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Although bolt hole and scallop geom
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■ Signal Processing Signal proces
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18.7.4 Eddy Current Probes for Jet
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FIGURE 40. Axial alignment of probe
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FIGURE 41. Footprints of eddy curre
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Many standard techniques for aircra
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FIGURE 42. Eddy current probes: (a)
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■ Wide Field Probes The term wide
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The disadvantages of the wide field
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18.7.5 Conclusion The testing of cr
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Vertical Liftoff Charlie Chong/ Fio
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Vertical Liftoff Charlie Chong/ Fio
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Harrier Jump Jet Charlie Chong/ Fio
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Harrier Jump Jet Charlie Chong/ Fio
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Harrier Jump Jet Charlie Chong/ Fio
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Charlie Chong/ Fion Zhang
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Good Luck! Charlie Chong/ Fion Zhan