AAE552-Session16

AAE552-Session16 - AAE 552 Spring 2009 A F Grandt AAE 552 Nondestructive Evaluation of Structures and Materials A F Grandt Jr Professor of

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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 16 – 18 February 2009 2 Contact Information Alten F. (Skip) Grandt, Jr. Email: [email protected] 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 16 18 February 2009 Last Time: penetrant inspection Today: Finish penetrant Pros/cons Video demonstration Start radiography 4 Assignment Please read Textbook : Chapter 11 Webpage powerpoint references “Radiographic Testing” – collaboration for NDT education Abstract #2 – Due Session 18 (23 February 2009) Paper#1 – Due Session 21 (2 March 2009) 5 Ch 10: Penetrant Inspection Penetration of colored liquid locates surface breaking anomalies 6 Chapter 10 Liquid Penetrant Inspection Major steps Classification of Penetrant Methods Penetrant Applications Safety Considerations Penetrant Advantages & Disadvantages
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AAE 552 Spring 2009 – A. F. Grandt 2 Dye Penetrant Inspection of Bicycle Crank Clean component Apply dye Dwell Remove dye Apply developer Examine Ref: http://materials.open.ac.uk/mem/mem_dye3.htm 7 8 Remove penetrant Apply developer Blooming effect Clean surface Apply penetrant Dwell crack Free surface Major Steps 9 Surface Cleaning Key step – must allow dye to penetrate into discontinuity Avoid “peening” component surface by mechanical cleaning (close cracks) Remove impurities Could react with penetrant Keep bath clean to reuse penetrant Be sure surface dry after cleaning Current EPA requirements ban some former cleaners Caution About Metal Smearing Some machining, surface finishing and cleaning operations can cause a thin layer of metal to smear on the surface and prevent penetrant from entering any flaws that may be present. Etching of the surface prior to inspection is sometimes required. Before Sanding After Sanding After Etching Penetrant Application – Step 2 Many methods of application are possible such as: Brushing Spraying Dipping/ Immersing Flow-on And more 12 Penetrant Classification Type I (fluorescent) View with black light Sensitivity levels ½ - ultra low 1 – low 2 – medium 3 – high 4 – ultra high Type II (non-fluorescent) Usually red Less sensitive ~ level 1
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AAE 552 Spring 2009 – A. F. Grandt 3 Why is Visible Penetrant Red and Fluorescent Penetrant Green? Visible penetrant is
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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.

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AAE552-Session16 - AAE 552 Spring 2009 A F Grandt AAE 552 Nondestructive Evaluation of Structures and Materials A F Grandt Jr Professor of

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