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Unformatted text preview: AAE 552 Spring 2009 A. F. Grandt 1 1 AAE 552: Nondestructive Evaluation of Structures and Materials A. F. Grandt, Jr. Professor of Aeronautics and Astronautics Purdue University W. Lafayette, IN 47907 Session 28 25 March 2009 2 Contact Information Alten F. (Skip) Grandt, Jr. Email: email@example.com Telephone: Office: 765-494-5141 Home: 765-463-4276 FAX: 765-494-0307 Course webpage accessed at: http://www.itap.purdue.edu/tlt/blackboard 3 AAE 552 Session 28 25 March 2009 Last Time: Chapter 11 & 12 problems Start eddy current Today: Eddy current parameters Depth of penetration Impedance testing 4 Assignment Please read: Chapter 13 in textbook: Eddy Current Testing Exam #1 Session 29 Cover material thru ultrasonic inspection (Ch 12 in text) See topic list and sample exam on webpage Term paper #2 Monday, 6 April (session 33) 5 Midterm Exam - Session 29 25% of final grade Final exam 30% (comprehensive) Paper 1 20% Paper 2 25% Closed book 1 page review sheet (both side of 8.5 x 11 inch sheet) Short answer, fill in blank, true/false, numerical calculations, etc. Chapters 1, 4, 10, 11, 12 Exam description and example exams on web page 6 Chapter 13: Eddy Current NDE ac coil induces electrical currents in test piece Versatile method to detect Cracks, anomalies Thickness Material properties microstructure conductivity magnetic permeability Residual stresses Etc. Limited to electrical conductors AAE 552 Spring 2009 A. F. Grandt 2 7 Eddy Current Inspection Alternating current in coil generates eddy currents in test piece that are disturbed by anomalies Eddy Currents Primary magnetic field Indicator Secondary Magnetic Field Test piece (conductor) 8 Test Measures Impedance of Coil and Coupled Test Object Test Object Opposing magnetic field Eddy currents Coil circuit impedance modified by coupling with induced eddy current field in test part varies with anomalies in component Ammeter A V V X V R X L R AC Source Coil 9 External Coil Test piece Surface Coil Test piece Internal Coil Test piece Test piece Schematic Representation of Eddy Current Coils (Fig. 13.2) 10 Factors that Influence Eddy Current Development Anomalies Conductivity Composition, temperature, heat treatment, hardness, microstructure, residual stress Magnetic permeability Lift-off and fill-factors Edge effects Depth of penetration Operating frequency Coil current 11 Conductivity of Metals and Alloys (Table 13.1) Metal or Alloy Conductivity % IACS* Silver 105 Copper, Annealed 100 Gold 70 Aluminum 61 Magnesium 37 70-30 Brass 28 Phosphor Bronzes 11 Monel 3.6 *IACS International Annealed Copper Standard (Copper = 100 %) 12 Conductivity of Metals and Alloys (Table 13.1) Continued Metal or Alloy Conductivity % IACS* Monel 3.6 Zirconium 3.4 Zircaloy-2 2.4 Titanium 3.1 Ti-6Al-4V Alloy 1.0 304 Stainless Steel...
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This note was uploaded on 11/04/2010 for the course AAE 552 taught by Professor Longuski during the Spring '10 term at IUPUI.
- Spring '10