AAE552-Session26

AAE552-Session26 - 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 26 – 13 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 26 13 March 2009 Last Time: Ultrasound generation/detection Parameter selection Instrumentation Today: Calibration Standards Data Presentations Applications Summary 4 Assignment Look over chapter 11 and 12 homework problems Exam #1 – Session 29 (Friday, 27 March 2009) Cover material thru ultrasonic inspection (Ch 12 in text) See topic list and sample exam on webpage 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 NDT Resource Center http://www.ndt-ed.org/ 6 This site was designed to be a comprehensive source of information and materials for NDT and NDE technical education. The site was created by NDT professionals and educators from around the world. (Thanks to Josh Haines)
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AAE 552 Spring 2009 – A. F. Grandt 2 7 Ultrasound Generation and Detection Piezoelectric transducers Electromagnetic-Acoustic Transducers (EMAT) Laser Generated Ultrasound Capacitive Transducers 8 Ultrasonic NDE Parameter Selection Consider component size, material, geometry Consider mode of sound wave Frequency selection Transducer selection Data presentation 9 Frequency Selection (Section 12.7) V = λ f = constant for material Compression wave speed > shear, surface waves f = frequency = V/ λ λλ Select high frequency ~ 1-10 MHz (small λ ) To increase sensitivity to small defects To increase resolution To decrease beam spread Select Low frequency ~ < 1 MHz (large λ ) To increase penetration For absorbing materials (decrease attenuation in polymers, concrete, wood, etc.) To decrease grain boundary scattering Instrumentation and Standards 10 11 Calibration Standards Calibration is a operation of configuring the ultrasonic test equipment to known values. This provides the inspector with a means of comparing test signals to known measurements. Calibration standards come in a wide variety of material types, and configurations due to the diversity of inspection applications. Calibration standards are typically
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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-Session26 - AAE 552 Spring 2009 A. F. Grandt AAE...

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