AAE552-Session25

AAE552-Session25 - AAE 552 Spring 2009 A. F. Grandt AAE...

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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 25 – 11 March 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 25 11 March 2009 Last Time: Ultrasonic inspection techniques Today: Prof. Hagvosky UT video (~4:20) Ultrasound generation/detection Parameter selection Instrumentation 4 Assignment Please read Textbook : Chapter 12 – Ultrasonics Webpage powerpoint references “Ultrasonic Testing, ” collaboration for NDT education Exam #1 – Session 29 (Friday, 27 March 2009) Ultrasonic NDE Techniques 5 6 Ultrasonic Inspection Techniques Immersion Conventional, water column, wheel transducer Contact Several interrogation strategies Pulse-echo (12.5.2) Thru-transmission (12.5.3) Angle-beam (12.5.4) Critical-angle (12.5.5) Continuous-wave (12.5.6) Time of Flight Diffraction (12.5.7)
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AAE 552 Spring 2009 – A. F. Grandt 2 7 Ultrasonic Pulse-Echo A B C D Test piece MB FE time B BE MB FE time C BE MB BE time D time MB BE A MB = main bang FE = flaw echo BE = back echo A-scan displays reflected signal amplitude vs time at various positions. Indicates flaw location via time scale 8 Thru-Transmission (Fig. 12.17a) Separate send & receive transducers Requires 2-sided access Good for highly attentive materials Only measure flaw presence - not location Could infer size by signal strength Good for flaws that don’t reflect well (inclusions, etc) Alignment and coupling of both transducers critical MB received time A MB received time B MB Nothing received time C A B C Send Test piece Receive Surface Wave (Halmshaw) 9 Typical Probe Configurations (Halmshaw) 10 11 Typical Probe Configurations (Halmshaw) Vertical Crack Configurations (Halmshaw) 12
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AAE 552 Spring 2009 – A. F. Grandt 3 Vertical Crack Configuration (Halmshaw) 13 14 Surface wave Send Reflected wave Diffracted waves Receive Time of Flight Diffraction (TOFD) Section 12.5.7, Fig 12.19 TOFD allows detection and location of crack Uses additional diffracted waves Used for weld inspection 15 Time-of-Flight Diffraction 4 signals at receiver Shear wave at surface Back face reflection Two diffracted rays from ends of crack (weak signals in coarse-grained materials) Detects and determines size of flaws Does not depend on crack orientation Must have access to both sides of weld Surface wave Send Reflected wave Diffracted waves Receive 16 Inspection Strategies Critical-Angle Techniques (12.5.5) Exploit unique reflection/refraction that occurs at critical incidence angles Critical angle sensitive to material properties,
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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-Session25 - AAE 552 Spring 2009 A. F. Grandt AAE...

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